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49 results about "Soil saturation" patented technology
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Saturation is the soil water content when all pores are filled with water. The water content in the soil at saturation is equal to the percent porosity. Field capacity is the soil water content after the soil has been saturated and allowed to drain freely for about 24 to 48 hours.
Device for accurately and rapidly determining permeability coefficient of soil
ActiveCN105588796AFast and fully saturatedNovel structurePermeability/surface area analysisSoil sciencePermeability coefficient
The invention discloses a device for accurately and rapidly determining the permeability coefficient of soil, and belongs to technical field of rock and soil analysis equipment. The device comprises a device rack and further comprises a water supply device, a rapid saturation device, a soil sample column, a support and a permeation flow testing device. The soil sample column is fixedly arranged on the support, the water supply device and the rapid saturation device are fixedly arranged above the soil sample column and connected with a cover plate at the upper end of the soil sample column, and the permeation flow testing device is arranged on one side of the support and connected with the lower end of the soil sample column through a testing water guide pipe. The device well solves the problems that soil saturation is not sufficient, and permeation flow reading errors are caused, the testing accuracy of the device is improved, flexible control over the hydraulic gradient is achieved, and the device is convenient to operate, high in precision, low in input cost and wide in application range.
Owner:YANGZHOU UNIV
Method for measuring soil suction according to light reflection theory
ActiveCN107957408ANo intrusive destructive disturbanceLow costScattering properties measurementsSuction stressGray level
The invention discloses a method for measuring soil suction according to a light reflection theory. The method mainly includes: (1) adopting the light reflection theory for measuring soil saturation degrees to distinguish dry soil and wet soil, and carrying out the next step if wet soil is determined; (2) selecting saturation degrees from a soil-water characteristic curve; (3) selecting dry density from an actual measurement solid-line curve; (4) compacting soil for measurement in a mould to the dry density selected in the step (3) and the corresponding saturation degree, and adopting a camerafor taking pictures; (5) quantifying images obtained in the step (4) by gray levels according to gray values; (6) analyzing average gray value variation conditions to find out a relationship betweenthe saturation degrees and the gray values. The method is a novel low-cost direct color analysis technique free of intrusion disturbance and applied to canal embankment, expressway and runway roadbeds, filling liners, earth dams and the like, limitations of common instruments for measuring suction of farmland and rock-soil base facilities are avoided, and an application range is expanded.
Owner:SHANTOU UNIV
Novel non-pressure irrigation rig
InactiveCN102160518AReduce flowNo cloggingWatering devicesCultivating equipmentsComing outWater level rise
The invention relates to a novel non-pressure irrigation rig. The water outlet valve of a water supply tank is opened, irrigation water flows into a water level control tank, when the water level of the tank is higher than h1, an intake tube is submerged, air suction is changed into water inflow until the water level in the intake tube is equal to the water level in the water supply tank, the irrigation water does not flow into the water level control tank, the water level of the tank is stabilized at the water level slightly higher than h1, the irrigation water enters into a filling area at the upper part in a U-shaped slot by virtue of a permeable cover plate and a sand inverted filter from the bottom in the U-shaped slot of the irrigator, a soil saturation water layer which is at the same height of the water level of the water level control tank and is lower than the upper edge of the U-shaped slot, water of the saturation water layer rises to the root layer of a crop in a capillary water way, a crop consumes water to cause the water level of the water level control tank to be lower than h1, the intake tube comes out of water surface, air is sucked in air bubbles, the irrigation water flows into the water level control tank, the water level rises to submerge the intake tube again, the crop consumes the water to cause the water supply process to be repeated, the output of supplying water is increased or reduced along with water consumption, irrigation is adaptive, and the irrigation rig is simple to operate and is convenient to use.
Owner:FARMLAND IRRIGATION RES INST CHINESE ACAD OF AGRI SCI
Combined cultivation method for water and soil conservation for sloping farmlands
InactiveCN102498779AReduce churnLoss avoidance or mitigationSoil-working methodsContour plowingBiology
A combined cultivation method for water and soil conservation for sloping farmlands relates to cultivation methods for water and soil conservation and solves the problem that using the single cultivation technique for holding water is unsatisfactorily effective. The combined cultivation method includes: firstly, adjusting ridges of sloping farmlands on downward slopes and inclined slopes under ridge plowing adjusted into transverse slope ridges, and adopting contour farming and belt planting; secondly, building ridges, and planting protective plant belts on the ridges; thirdly, subsoiling forfarming; fourthly, performing furrow damming; and fifthly, performing no-tillage conservation tillage. Furrow subsoiling and furrow damming are technically combined and integrated according to soil and weather characteristics of a black soil area, so that water and soil loss is reduced or avoided for sloping farmlands to the greatest extent, water and soil are conserved, water utilization rate isincreased, and crop yield is increased evidently. By the method, soil saturation and infiltration speed ratio is increased by 24.1% in processing treatment, water utilization rate is increased by more than 15%, crop yield is 30kg per mu, and 100 Yuan per mu is increased..
Owner:NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
Soil saturation hydraulic conductivity measuring and calculating method based on infiltration time characteristic parameters
InactiveCN101762445AReduce investmentWell formedPermeability/surface area analysisSoil scienceWater level
The invention provides a soil saturation hydraulic conductivity measuring and calculating method based on infiltration time characteristic parameters. In the method, the quantitative relation of the characteristic parameters (skewness, kurtosis and variation coefficients) of soil saturation hydraulic conductivity and infiltration time data is built on the basis of analyzing Philip-Dunne infiltration data under three soil texture conditions of clay, loam, sand and the like, and the water content change of soil before and after infiltration does not need any consideration when the method is utilized to measure and calculate the soil saturation hydraulic conductivity, and only the accumulative infiltration time which corresponds to different water levels in a Philip-Dunne infiltration meter needs to be observed, therefore simplifying the calculating process of the saturation hydraulic conductivity and increasing the measuring efficiency.
Owner:LUDONG UNIVERSITY
Automatic investigation system of rock-soil saturation infiltration
InactiveCN1598533ASimple structureEasy to operate and manageSurface/boundary effectPermeability/surface area analysisWater balanceBottle
The invention provides an automatic measuring system for rock saturation and infiltration, its character lies in: the measuring system includes water supplying device connected by pipes, double-circle infiltration device, flow measuring device, the outlet of the double-ring infiltration device is connected to the inlet of the tip flow measuring device, water from the flow measuring device enters the water supplying device through a pump, the rate of ground water saturation and infiltration into the rock according to the water quantity difference entering and flowing out the double-circle in unit time. Compared with current measuring method, it changes the traditional thinking which changes the water level in concentric ring or in martensite bottle, according to dynamic water balance theory, the infiltration rate can be acquired through measuring the outlet flow of the concentric ring, thus the automatic monitoring of water data is possible, and the measuring accuracy is upgraded greatly. The measuring system in the invention is simple, and the management is convenient.
Owner:INST OF GENETICS & DEVELOPMENTAL BIOLOGY CHINESE ACAD OF SCI
Sandy soil saturation measuring method
ActiveCN108693328AEasy to operateIntuitive and reliable resultsEarth material testingSoil scienceAtmospheric pressure
The invention relates to a sandy soil saturation measuring method. The method comprises following steps: (1) adding a sandy soil sample with a volume of V into a sample container, and vacuumizing thesandy soil sample and a constant head device in the sample container; (2) introducing carbon dioxide into the vacuumized sandy soil sample and the constant head device; (3) repeating steps (1) and (2)for many times; (4) simultaneously vacuumizing the sandy soil sample and the constant head device; (5) carrying out constant head saturation on the sandy soil sample by using the constant head deviceuntil the surface of the sandy soil sample is submerged by water; (6) after constant head saturation, exposing the sandy soil sample to atmosphere under a normal atmospheric pressure of P1; (7) vacuumizing the sandy soil sample again until the vacuum degree reaches P2; (8) measuring the change of liquid level heights of the sample container under different pressures in the steps (6) and (7), andobtaining the volume change ([delta]V); and (9) calculating the saturation (Sr) of the sandy soil sample based on a saturation formula.
Owner:INST OF ENG MECHANICS CHINA EARTHQUAKE ADMINISTRATION
Determination device for saturation moisture content of soil
InactiveCN105699120AAvoid churnThe saturated water content is continuously stableWithdrawing sample devicesPreparing sample for investigationRing deviceEngineering
The invention provides a determination device for saturation moisture content of soil. The determination device is used for solving the technical problem of low determination precision of the determination device for soil saturation moisture content in the prior art. The determination device comprises a cutting ring device, a constant water-level water tank, a circulation water tank and a driving pump, wherein the constant water-level water tank is arranged in the cutting ring device; a water outlet is formed on a side face of the constant water-level water tank; the water outlet is aligned with the top end of the cutting ring device; the water level of liquid level in the circulation water tank is lower than the water outlet; the circulation water tank is connected with a water inlet pipeline; the tail end of the water inlet pipeline enters into the tank body of the constant water-level water tank along a clearance between the constant water-level water tank and the cutting ring device; the tail end of the water inlet pipeline is lower than the cutting ring device; and the driving pump is arranged on the water inlet pipeline. In a use process, the circulating water in the circulation water tank is driven by the driving pump, the circulating water entering into the constant water-level water tank enters into the cutting ring device from the bottom of the cutting ring device, and when water level of the constant water-level water tank reaches the water outlet, the circulating water returns to the circulation water tank through the water outlet.
Owner:BEIJING FORESTRY UNIVERSITY
Two-dimensional pile soil interaction experiment system based on PIV technology and experiment method
ActiveCN109490111AChange the stiffnessChange depthMaterial strength using repeated/pulsating forcesEngineeringData collecting
The invention relates to a two-dimensional pile soil interaction experiment system based on PIV technology and an experiment method. The system comprises a two-dimensional vibration generating structure capable of controlling vibration force amplitude and vibration frequency, and the two-dimensional vibration generating structure is arranged on a plane; the system further comprises a data collecting and processing module applying PIV technology and in communication connection with the two-dimensional vibration generating structure through a data line. By the system and the method, vibration frequency, force amplitude, pile foundation rigidity, pile foundation buried depth, soil saturation and uniformity can be changed directly or indirectly, and impact of the above factors on soil movementcan be researched; soil particle movement process can be measured by adopting a noncontact way without damaging undisturbed soil.
Owner:HOHAI UNIV
Cultivation method for directly returning full-amount rice straw to field in the western Jilin region
PendingCN112889606AImprove maturity rateQuality improvementRice cultivationSoil-working methodsAgricultural engineeringVermin
The invention provides a cultivation method for directly returning full-amount rice straw to the field in the western Jilin region. The cultivation method comprises the following steps: step 1, crushing and throwing of rice straw; step 2, turning, rotating and mixing of the straw; step 3, dry spinning and leveling; step 4, field steeping in a soil saturation mode; step 5, slurry stirring; step 6, leveling; step 7, slurry settling; step 8, field management; and step 9, disease and pest control. After the rice is harvested, stubbles of the straw are thoroughly decomposed, disease aggravation cannot be caused after the straws are returned to the field through a series of treatment steps, diseases such as rice blast, banded sclerotial blight and false smut are efficiently prevented and controlled, and the effect of preventing and controlling rice-stem borers and leaf miners is remarkable; and according to the method, the decomposition rate of the rice straw returned to the field in the cold region is greatly increased, the pest damage phenomenon is reduced, the planting quality of plants returned to the field is ensured, and the method has important significance on straw resource utilization and improvement of the soil quality of the rice field.
Owner:JILIN ACAD OF AGRI SCI
Indoor simulating and monitoring method of underground ice isotope fractionation process
InactiveCN107621531AImprove operational efficiencyImprove portabilityEarth material testingBound waterSoil science
The invention provides an indoor simulating and monitoring method of an underground ice isotope fractionation process. The indoor simulating and monitoring method of the underground ice isotope fractionation process comprises the following steps: simulating many types of soil saturation processes; testing isotope ratios of free water in the soil saturation processes; testing isotope ratios of bound water in the soil saturation processes; tracing isotopic fractionation of the free water and the bound water in the soil saturation processes; simulating the freezing and thawing process of saturated soil; tracing the isotopic fractionation of the free water and the bound water in the freezing and thawing process; simulating the forming process of underground ice in the saturated soil, and dividing the development stage of the underground ice; tracing isotope fractionation of the underground ice according to the development stage of the underground ice; assessing isotope fractionation of thefree water and the bound water in the process of participating in formation of the underground ice. By the indoor simulating and monitoring method, the operating efficiency is high, the portability is strong, a moisture and soil coupling action as well as the isotope fractionation process in the free water and bound water migrating and converting process and other key processes are scientificallyanalyzed, and obtained research results are reliable.
Owner:HOHAI UNIV
Soil saturation experiment and permeation experiment compound device
The invention discloses a soil saturation experiment and permeation experiment compound device. The device mainly comprises a soil saturation experiment device and a soil permeation experiment device. The soil saturation experiment device and the soil permeation experiment device are connected through a transparent pipeline with double scales and a connecting pipeline. The upper end of the transparent pipeline can be connected with a gas pressurizing device with air pressure value reading function, and the whole compound device is supported by a bottom support. The device is a simple experiment device integrating a soil saturation experiment and a soil permeation experiment uniquely in the prior art, the device can be made of organic glass or stainless steel, rubber and other low cost materials, operability of a soil sample determination experiment is promoted on the whole, for the determination experiment with the large soil sample class number, labor resources are saved, the utilization efficiency of the device and time is improved, the gas pressurizing device is used for determination of ordinary soil sample parameters and especially can be used for soil sample parameter determination with high clay content and dense soil particle arrangement, the experiment time can be greatly shortened, and the time cost is reduced.
Owner:WUHAN UNIV
Hollow cylinder compacted soil sample saturation device
PendingCN107727477AGood support and permeable effectAvoid saturationPreparing sample for investigationEngineeringWall effect
The invention belongs to the technical field of soil engineering tests, and discloses a hollow cylinder compacted soil sample saturation device. The device comprises a saturator head cover, a lock nut, a trivalve diaphragm, a pull rod, a retaining ring, a saturator base, a top water permeable stone, a hollow cylindrical porous stone, a soil sample and a bottom porous stone, wherein the hollow cylindrical porous stone is arranged at the bottom of the top porous stone; the bottom porous stone is arranged at the bottom of the hollow cylindrical porous stone, the hollow cylindrical porous stone iscompletely coated with the trivalve diaphragm, the hollow cylindrical porous stone and the trivalve diaphragm are arranged inside the saturator bottom, and the trivalve diaphragm is fixed by the retaining ring; the head cover and the saturator base are connected and fixed through the pull rod; and the pull rod is fixedly connected through the lock nut. The hollow cylinder compacted soil sample saturation device has an excellent supporting and water penetrating effect for the inner wall of a soil sample by a simple treatment method for adding the hollow cylindrical porous stone, and can be used for well solving the problem of HC soil sample saturation.
Owner:NINGBO UNIVERSITY OF TECHNOLOGY
Reaction device for ex-situ remediation of soil and ex-situ remediation method of soil
PendingCN114309049AAvoid secondary pollutionEasy to calculateContaminated soil reclamationSoil scienceSoil remediation
The invention provides a reaction device for ex-situ remediation of soil and a soil ex-situ remediation method, and belongs to the technical field of soil remediation, the reaction device for ex-situ remediation of soil comprises: a concrete pool having a bottom wall and a side wall, the side wall being perpendicular to the bottom wall; a drainage ditch is arranged outside the concrete pond and communicated with the bottom wall of the concrete pond, and the other end of the drainage ditch leads to the water collecting well; according to the reaction device for ex-situ remediation of the soil, the to-be-remediated soil is contained in the concrete pool, and the side wall of the concrete pool is perpendicular to the bottom wall, so that the volume of the to-be-remediated soil can be conveniently calculated according to the volume of the concrete pool, and the feeding ratio and the water adding amount of an agent can be accurately controlled according to the volume of the soil; controlling the moisture content of the soil to reach the soil saturation moisture content as much as possible; in addition, the device can also be used for conveying overflowed mud into a concrete pool for secondary remediation, and can be used for monitoring the reaction temperature of the soil and the moisture content of the soil in real time.
Owner:BCEG ENVIRONMENTAL REMEDIATION CO LTD
Water draining groove
The invention discloses a water draining groove. The water draining groove comprises conductive core grooves for containing water flow, a positive pole buckling part, a negative pole buckling part, water-pervious insulation films wrapping the conductive core grooves and a connecting buckling part connected between the conductive core grooves, wherein the positive pole buckling part and the negative pole buckling part are arranged at the two ends of the water draining groove. According to the plastic water draining groove, through an electrolytic saturated sand foundation, the good water draining effect can be ensured, the sandy soil saturation can be actively reduced, and the anti-liquefaction capability of the sand foundation can be improved.
Owner:HOHAI UNIV
Full automatic soil saturation device
ActiveCN106908296ACreate novel structuresCreate a reasonable structureClimate change adaptationPreparing sample for investigationSoil scienceAgricultural engineering
A full automatic soil saturation device belongs to civil engineering experimental instruments; the full automatic soil saturation device is matched with a plurality of motors and all kinds of a plurality of sensors by a circuit assembly to realize automatic filling and piecewise compaction functions, by a rotary build-in blade, each stage of soil material compaction surface can be polished, the combination is more natural and more uniform; the full automatic soil saturation device is novel, reasonable and simple in structure, can realize automated operation, operation is simple and convenient, operating staff can be saved, labor intensity is low, soil sample preparation precision is high, and operation is stable and reliable.
Owner:NORTHEAST AGRICULTURAL UNIVERSITY
Permeation consolidation device for measuring soil saturation and use method thereof
PendingCN114324101AReduced measurement timeHigh degree of automationEarth material testingPermeability/surface area analysisSoil sciencePolyethylene glycol
The invention discloses a permeation consolidation device for measuring soil saturation and a use method thereof. The device mainly comprises a base, a side wall, two permeable stones, two permeable membranes, a driving part, a piston and an electrode, the side wall is arranged on the base, the two permeable stones and the side wall are encircled to form an accommodating cavity for accommodating a soil sample, the two permeable membranes are respectively attached to the corresponding permeable stones, and the permeable membranes can permeate water molecules and block polyethylene glycol molecules; the driving piece is connected with the piston so as to drive the piston to be close to or away from the permeable stone; the base and the piston are respectively provided with a channel communicated to the corresponding porous stone, the channels are used for introducing a polyethylene glycol solution, and the electrode is embedded into the side wall and partially extends into the accommodating cavity to measure the resistivity of the soil sample. The testing device is used for measuring the saturation degree in the soil consolidation test or penetration test, and has the advantages of high accuracy, high automation degree, monitoring cost saving and the like.
Owner:SOUTHEAST UNIV
Method for confirming sand lens gathering oil gas critical conditions
InactiveCN103645518AChange particle sizeGuide explorationEarth material testingGeological measurementsCritical conditionSoil science
The invention provides a method for confirming sand lens gathering oil gas critical conditions. The method for confirming the sand lens gathering oil gas critical conditions comprises filling surrounding rock simulation with oil saturability achieves a saturability limiting value and filling sand simulation with water saturability achieves a saturability limiting value into the reserved space inside the surrounding rock simulation; taking out the sand simulation inside the surrounding rock simulation after a scheduled time; confirming an oil saturation of the sand simulation; enabling grain diameter of the surrounding simulation and sand simulation and the soil saturation to be served as a group of oil saturation data; changing the grain diameter of the surrounding rock simulation or changing the grain diameter of the sand simulation and repeatedly performing the above steps until a plurality groups of oil saturation data is obtained; confirming the sand lens gathering oil gas critical conditions according to the plurality groups of oil saturation data. The method for confirming the sand lens gathering oil gas critical conditions effectively guides exploration of sand lens oil and gas reservoirs due to the fact that the sand lens gathering oil gas critical conditions are provided quantitatively.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)
Combined cultivation method for water and soil conservation for sloping farmlands
InactiveCN102498779BReduce churnLoss avoidance or mitigationSoil-working methodsBiologyContour plowing
Owner:NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
Method for controlling potted plant soil water
InactiveCN106962150AConvenience for stress resistance researchEasy to useWatering devicesHumidity controlSoil scienceDry soil
The invention discloses a method for controlling potted plant soil water. A weighing method is adopted, the soil water adding amount is calculated according to the soil air-dried soil weight, the soil water content, the soil saturation water content, the empty pot weight and the plant weight, and therefore the potted plant soil water is controlled. Adopted instruments are simple, the cost is low, the method is reliable, and convenience is provided for crop stress resistance study.
Owner:GUIZHOU UNIV
Determination method of crop soil root system gas content
PendingCN114518442AAccurate measurement dataClimate change adaptationEarth material testingSoil gasSoil science
The invention relates to a crop soil root system gas content determination method, which comprises: carrying out in-situ moisture determination on different root system layers of soil, determining the soil saturation water content Vs, the soil field moisture capacity Vc and the soil water content Vw of crops in different growth stages, and calculating to obtain the actual total gas content Valpha of the soil root system, the actual water content Vwi of soil at different depths is measured in real time by using a soil moisture layering tester, and the actual total gas content Valpha of the soil root system is calculated according to the following formula: Va = Sigma Vai = Sigma Vsi-Sigma Vwi. The water content of soil at different depths is detected, the soil gas content is quantitatively calculated through the water change, the moisture content of crop soil root systems is monitored in real time, and nutrient adjustment and irrigation amount are facilitated.
Owner:HEBEI RUNNONG WATER SAVING TECH
Repair system for strengthening oxidation-reduction reaction through in-situ hydraulic driving
ActiveCN114769301AAchieve high utilizationEfficient integrated repairContaminated soil reclamationLiquid storage tankEnvironmental engineering
The invention discloses an in-situ hydraulic drive enhanced oxidation-reduction reaction remediation system which is used for remediating polluted soil and underground water and comprises a hydraulic drive circulating system and a reaction grid system. The hydraulic driving circulating system comprises a driving assembly and a liquid storage tank; the reaction grid system is connected with the liquid storage tank through the driving assembly; the reaction grid system is arranged underground until reaching a soil saturation zone; the reaction grid system comprises a soil reduction purification unit and a soil oxidation purification unit which are connected in series. The device aims at a site polluted by a water-soluble dye, efficient soil and underground water integrated remediation can be achieved, and a satisfactory pollutant removal effect can be achieved within a short time through hydraulic driving. When the repairing system operates, normal production and life on the ground are not affected, and high utilization of resources is achieved.
Owner:EAST CHINA UNIV OF SCI & TECH
Prediction Method of Saturated and Unsaturated Permeability Coefficient of Deformed Soil Based on Fractal Theory
Owner:HUBEI UNIV OF TECH
Improved soil saturation water conductivity detection system
PendingCN112179828AAccurate calculationAvoid experimental errorPermeability/surface area analysisWater resource assessmentWater useSoil science
The invention relates to an improved soil saturation water conductivity detection system. The system comprises a sample information module, a water stop timing module, a temperature measurement module, a weighing module and a processing module. The sample information module in the system records the number, the length, the cross sectional area and the experimental water level difference of a soilsample; the water stop timing module records experiment time; the temperature measurement module detects the temperature of the experimental water and determines the density of the water at the watertemperature according to the detected temperature; the weighing module is used for detecting the weight of discharged water; and the processing module is used for calculating the saturated water conductivity of the soil sample according to the data of the sample information module, the water stop timing module, the temperature measurement module and the weighing module and a model. The volume reading is improved into density calculation under the condition that the mass is divided by the experimental water temperature, so that the result is more accurate; the designed water receiving containeris narrow and small in opening and attached to the latex tube, splashing and evaporation during water receiving are prevented, and the result is more accurate; experimental errors caused by the factthat experimenters open / close the measuring valves one by one and time according to a second chronograph can be avoided, and calculation of the saturated water conductivity is more accurate; and the saturated water conductivity can be automatically calculated and displayed, the operation is simple and convenient, and the experiment efficiency is higher.
Owner:陕西地建土地工程技术研究院有限责任公司
A method for testing the moisture content of saturated soil samples
ActiveCN105116016BQuick measurementEasy to measureMaterial analysis by electric/magnetic meansBound waterVoltmeter
Owner:CHONGQING UNIV
A device and application for repairing environmental pollution in rock formations using nanotechnology
ActiveCN104140153BEfficient removalLow costContaminated soil reclamationWater/sewage treatment by reductionSoil contaminationWater flow
Owner:常州德申环保工程有限公司
Method for carbon sequestration, emission reduction, weight loss and efficiency improvement of machine-harvested rice in coastal rice area of eastern Hebei province
ActiveCN114287302APromote the process of resource utilizationReduce pollutionRice cultivationSoil-working methodsEcological environmentInsect pest
The invention provides a method for carbon sequestration, emission reduction, weight loss and synergy of machine-harvested rice in a coastal rice area of East Hebei Province, which comprises the following steps: harvesting rice by using a harvester from the end of October to the first ten days of November, crushing straws, putting the crushed straws in situ, spreading a rice straw decomposing inoculant, and turning over; irrigating in a non-cultivation period until the soil saturation water content is reached; rotary tillage is conducted at the beginning of May in the second year, harrowing is conducted in the middle ten days of May, 450-600 kg / hm < 2 > of nitrogen-phosphorus-potassium slow-release fertilizer is applied to serve as base fertilizer, and sealing treatment is conducted 5-7 days before rice transplanting; transplanting is conducted in mid-to-late May, topdressing is conducted three times after transplanting, 97.5 kg / hm < 2 > of urea is topdressed for the first time, and 112.5 kg / hm < 2 > of urea is topdressed for the second time to the third time; and spraying pesticides for prevention and treatment before diseases and insect pests occur. According to the method, the resource utilization process of the rice straw is promoted, environmental pollution is reduced, the ecological environment is protected, good economic, ecological and social benefits are achieved, and green and sustainable development of agriculture is facilitated.
Owner:COASTAL AGRI RES INST HEBEI ACAD OF AGRI & FORESTRY SCI
A cylinder infiltrator for measuring saturated hydraulic conductivity of undisturbed soil and its measuring method
ActiveCN110595984BSimple structureEasy to manufactureEarth material testingPermeability/surface area analysisExhaust valveEngineering
The invention discloses a cylinder infiltration instrument for measuring the saturated hydraulic conductivity of undisturbed soil and a measuring method thereof. The cylinder infiltration instrument includes a cylinder, a top plate, a partition, an exhaust pipe and a water outlet pipe, and the top plate is sealed and installed on the cylinder. On the top of one end of the cylinder, the partition is sealed and installed on the upper part of the other end of the cylinder. One end of the exhaust pipe is pierced on the top plate, and the other end of the exhaust pipe is connected to the partition. There is a vent hole on the exhaust pipe, and the outlet pipe runs through Installed on the partition, the nozzle of the exhaust pipe is equipped with an exhaust valve, the nozzle of the outlet pipe is installed with a water stop valve, the top plate is equipped with a water inlet and a rubber plug, and the bottom of the cylinder is installed with a water-permeable pad. There is a scale on the side wall of the cylinder. The infiltration meter has a simple structure and can quickly and accurately measure the saturated hydraulic conductivity of the undisturbed soil, so as to solve the problems of cumbersome operation and low accuracy of the existing hydraulic conductivity measurement devices. The calculation results of the method are not disturbed by too many factors, and avoid the mixing of various data to cause the hydraulic conductivity K s The phenomenon that the accuracy deviation of the calculation results is too large.
Owner:LANZHOU UNIVERSITY OF TECHNOLOGY
A Method of Measuring Soil Suction Using Light Reflection Theory
ActiveCN107957408BNo intrusive destructive disturbanceLow costScattering properties measurementsSoil scienceImagery analysis
The invention discloses a method for measuring soil suction according to a light reflection theory. The method mainly includes: (1) adopting the light reflection theory for measuring soil saturation degrees to distinguish dry soil and wet soil, and carrying out the next step if wet soil is determined; (2) selecting saturation degrees from a soil-water characteristic curve; (3) selecting dry density from an actual measurement solid-line curve; (4) compacting soil for measurement in a mould to the dry density selected in the step (3) and the corresponding saturation degree, and adopting a camerafor taking pictures; (5) quantifying images obtained in the step (4) by gray levels according to gray values; (6) analyzing average gray value variation conditions to find out a relationship betweenthe saturation degrees and the gray values. The method is a novel low-cost direct color analysis technique free of intrusion disturbance and applied to canal embankment, expressway and runway roadbeds, filling liners, earth dams and the like, limitations of common instruments for measuring suction of farmland and rock-soil base facilities are avoided, and an application range is expanded.
Owner:SHANTOU UNIV
Soil physical property and remote sensing data fused surface soil water content inversion method
PendingCN114461971AImprove inversion accuracySolve for ignoring differences in water-holding capacity of different types of soilsComplex mathematical operationsICT adaptationSensing dataData set
The invention discloses a surface soil water content inversion method fusing soil physical characteristics and remote sensing data. The method comprises the following steps: constructing an input data set; selecting a vegetation coverage index FVC and a surface temperature T * to construct a T *-FVC feature space; calculating a surface soil water content relative index M0 according to the feature space; according to soil test point data, a statistical model of soil saturated volumetric water content and soil porosity is established, and the saturated volumetric water content of each pixel of different types of soil is calculated according to the model. And finally, coupling the soil water content relative index M0 with the soil saturation volumetric water content and the wilting point surface soil volumetric water content, and constructing a surface soil volumetric water content quantitative inversion model. According to the model, soil physical characteristics and remote sensing data are fused for surface soil volumetric water content inversion, the problem that high-precision calculation of the volumetric water content is difficult due to the fact that a traditional remote sensing method ignores the difference of different types of soil water holding capacities is solved, and high-precision inversion of the surface soil volumetric water content is achieved.
Owner:GUILIN UNIVERSITY OF TECHNOLOGY
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