4908 results about "Soil fertility" patented technology

The invention relates to a group of alive microbial preparations for preparing compound microbial fertilizer and the preparation method thereof. The alive microbial preparations include a microbial inoculant and an organic material degradation agent. The microbial inoculant includes Bacillus megaterium, Bacillus licheniformis, Bacillus mucilaginosus, Bacillus laterosporus, Azotobocter chroococcum, etc. The organic material degradation agent includes Bacillus megaterium, Bacillus licheniformis, Bacillus subtilis, Bacillus circulans, Saccharomyces cerevisiae, Candida lipolytica, Bacillus pumilus, Bacillus cereus, Streptomyces griseus, Pseudomonas alcaligenes, Pseudomonas cepacia, Streptococcus salivarius subsp. Thermophilus, Geobacillus stearothermophilus, Streptomyces Thermophilus, Geotrichum candidum and Aspergillus oryzae. The preparation method comprises the following steps: carrying out submerged fermentation, directly mixing the bacterial liquids and stirring to obtain a liquid preparation; or mixing with an absorbent to obtain a solid preparation. The alive microbial preparations have the advantages of improving soil fertility, promoting plant growth, enhancing anti-disease, anti-insect and anti-drought capacities of plants, improving quality of agricultural products and so on.

The invention provides a multifunctional soil nutrient conditioner formula with low cost, practicality and effectiveness and a preparation method thereof aiming at the technical problems. The production technology is simple, the production cost is low, and no harmful gas and sewage are generated during production. The product can effectively provide dozens of nutritive elements required for plant growth, is applied by being combined with a common fertilizer and an organic fertilizer, and can obviously improve the utilization rate of the fertilizer, so as to reduce the fertilizer input; and simultaneously the product can obviously stimulate action of beneficial floras of the soil, inhibit action of causal organisms, and increase the disease suppression of the soil and the resistance of plants, and then can effectively control generation of physiological diseases and soil-borne diseases, so as to reduce the pesticide input. The fertilizer input and the pesticide input can be reduced by more than 15 to 30 percent, and the yield can be increased by more than 15 to 30 percent, and simultaneously the product quality is obviously improved and cost conservation and synergism are obvious. Moreover, the soil improvement effect is obvious, and the sustainable utilization capacity can be obviously enhanced.

The subject invention provides methods for producing homogenous organic base fertilizer for plant nutrition and soil fertility. Also provided by the subject invention are value added fertilizer products for plant nutrition and soil fertility and concentrated liquid formulations / nutrient supplements that provide the value added nutrients to fertilizer products. Methods according to the invention involve the application of concentrated liquid(s) and / or dry formulation(s) comprising a mixture of one or more plant nutrient(s), one or more additional organic compound(s), one or more penetrate(s), and one or more optional supplement(s) into one or more organic base material(s). These organic base materials include, and are not limited to, biosolids, activated sludge, municipal compost, animal manures (e.g., horse, cow, chicken, pig, and sheep), and composted organic byproducts.

The invention relates to a method for accurate fertilization for apple tree. The method decides target yield according to soil fertility based on 4000 kg of high quality organic fertilizer, then determine fertilizer consumption according needed fertilizer, fertilizer supply ability by soil and fertilizer availability, dressing all organic fertilizer, 70% of the nitrogen fertilizer and phosphatic fertilizer and 50% of potassium fertilizer as base fertilizer, taking left fertilizer for additional dressing, dressing the left 30% nitrogen before germination, dressing the left 30% phosphatic fertilizer before flower bud differentiation, dressing left potassium fertilizer during fruit expanding period, spraying fertilizer on leaf in different growing period for 6- 8 times in one year. The productivity and output value are increased by 21.5% and 21.3% respectively, the high- quality fruit rate is increased from 35% to 62%,and the net value is added by 615 yuan per mu.

The invention relates to a full-variable fertilizing device capable of adjusting the fertilizer sowing quantity and proportion and a control method thereof. The device comprises three fertilizer cans, three rows of fertilizer feeders corresponding to the three fertilizer cans, three fertilizer discharging shafts, three fertilizer discharging shaft driving motors, a blending fertilizer falling pipe, a blending auger, an auger driving motor, a fertilizer falling pipe fixing plate, and an electrical control part. The control method is characterized in that under the control of the electrical control part, by controlling the rotating speeds of the fertilizer discharging shafts, the fertilizer sowing quantities of the fertilizer cans are controlled, so that different unit fertilizers or composite fertilizers in the three fertilizer cans are uniformly blended according to the proportion of nitrogen to phosphor to potassium, and the real-time accurate full-variable intelligent fertilizer control of the fertilizer quantities and proportion of nitrogen, phosphor and potassium is realized accurately on line at real time, and the contradiction between space-time difference and crop nutritional requirement difference of soil fertility distribution is balanced easily. The device has simple structure and small time lag in the process of discharging fertilizer. According to the variable fertilizing formula and the location of the device, the device is operated without a driver, and the operation is convenient. According to the invention, the blending technology of fertilizers is shifted from factory technology to fertilization process, and the problem of nonuniform distribution of nutrients in packages caused by easy layering of fertilizers in the storage and transportation process of bulk blending (BB) fertilizers is eliminated.

The invention relates to a restoration method for a damaged ecosystem in a steep-slope area in a water-level-fluctuating zone of a reservoir. The method comprises the following steps:when the impounded water level is at the lowest point, cleaning the upstream slope in the water-level-fluctuating zone, and manually tamping; digging planting holes at the top of the slope, and planting Chinese red pines and the like to form a multifunctional protective forest belt; digging planting grooves and planting holes within the range of the water-level-fluctuating zone, laying jute geotextile, planting vetiver within the range with the water-level-fluctuating depth of 2m to form a hedgerow; and mixedly planting vetiver and wire grass within the range with the water-level-fluctuating depth of 2-10m to form a combined vegetation slope restoration belt. The protective forest belt, the hedgerow and the combined vegetation slope restoration belt form a three-dimensional restoration space together, thereby ensuring that plants can take roots and restore in the steep-slope area in the water-level-fluctuating zone. By restoring the vegetation in large area, the invention effectively reduces the overland flow and the soil erosion, and improves the fertility and the properties of the soil, thereby restoring the damaged ecosystem. The invention has the advantages of convenient construction and less investment, can not be easily damaged by water, and is applicable to the water-level-fluctuating zone of a reservoir with large water-level-fluctuating range and precipitous topography.

The invention relates to a detection device and a monitoring system for soil relative humidity and soil fertility change. The detection device comprises a columnar body, a capacitive sensor which is arranged on the columnar body and is used for detecting soil, a frequency generator which is used for generating the working frequency of the capacitive sensor, a processing circuit which is used for processing detection signals obtained by the capacitive sensor and an anticorrosive shell which is arranged outside the capacitive sensor and the processing circuit, wherein different resonant frequencies can be generated through the frequency generator to enable the same capacitive sensor to detect the soil relative humidity and the soil fertility change. The soil relative humidity and the soil fertility can be monitored through the detection device which is buried in the soil for a long term, the parameters of the soil at different depths can be monitored at the same time and therefore effective guidance parameters are provided for fine management in the crop growth process.

The invention relates to a method for ameliorating a saline and alkaline land, in particular to a method for ameliorating a saline and alkaline land with heavily adhesive soil, which comprises: building raised fields to form a pattern of alternately distributed raised fields and shallow pools; preparing a raised field 1 to make a slope with two inclined sides, applying crushed straw and fermented cow dung on the surfaces of the raised fields, deeply plowing and raking the raised fields flat, wherein the vertical structure of each raised field comprises a bottom water isolating layer, bottom discharge pipes, a top water isolating layer and ridges from bottom up; and pilling sea ice or saline ice in the shallow pools on the surfaces of the raised fields, covering non-woven fabrics or crop straw on the surface of ice piles, and fixing covering materials on the surfaces of the raised fields. The method has the characteristics of high rate of desalination, soil fertility improvement, drought resistance and soil moisture conservation.

The invention relates to a saline-alkali soil improving agent and its preparation method. The preparation method comprises the following steps: mixing Rhodopseudomonas palustris, Pichia membranefaciens Hansen bacterium, lactobacillus casei, Staestomyces microflavus and seaweed slurry, organically combining a plurality of beneficial microorganisms and seaweed through multi-time fermentation, culturing in a compound mode to obtain a novel microorganism agent-seaweed bio-fungus. adding a proper amount of humic acid, organic matter, active zeolite powder and molasses, fermenting and drying the fermented product. The saline-alkali soil improving agent uses a plurality of microorganisms and employs strong effects of a unique ionic adsorbent, an organic neutralization balancing agent, an ion-exchange agent and a beneficial bacteria conversion starter to achieve the purposes of improving the soil environment, regulating acid-base balance, reducing the salt content, effectively raising the soil fertility and permeability, loosening the soil, eliminating the soil hardening, degrading the harmful substance and promoting the accumulation and conversion of the organic substance.

The invention provides a soil heavy metal composite passivating agent, comprising the following raw materials in percentage by mass of: 25% of slaked lime, 10-20% of monopotassium phosphate, 20-45% of plant ash and 20-45% of silkworm excrement. With the adoption of the soil heavy metal composite passivating agent disclosed by the invention, compared with a control group, an effective state lead content of the soil polluted by heavy metal is reduced by 20.23-47.61% within culture time of 30 days, and an effective state cadmium content is reduced by 20.15-50.57%; the passivating effect of the soil heavy metal composite passivating agent on the heavy metal is extremely obvious; and meanwhile, compared with the control group, the content of organic matters is improved by 48.62-64.47%, and the soil fertility is obviously improved. A method disclosed by the invention is applicable to repairing large-area heavy metal polluted soil and comprises the steps of repairing a heavy metal polluted farmland and repairing a heavy metal polluted mine; and the method has the advantages of lower cost, rapidness for repairing, simplicity in operation, feasible method and extremely great popularization value.

The invention provides a method for rejuvenating old trees. The method includes the steps of improving soil fertility, improving soil permeability, revering the original ecological environment of the old trees, repairing scars or tree holes, supplementing nutrition for the old trees, protecting the old trees by building rails, clipping shrunk crowns and conducting disease and pest control. According to the method for rejuvenating the old trees, optimizing processing is conducted on each step of rejuvenating the old trees, and old tree rejuvenation is made to be guaranteed through corresponding methods and measures. When the old trees are rejuvenated through the provided method, the effect is obvious, the facility is simple, the rejuvenation success rate is high, the method is very effective particularly for the old trees and famous wood species, wherein the old trees and the famous wood species are serious in tree vigor weakening condition and basically lose vigor.

The invention belongs to the technical field of fertilizer, particularly relates to disease-resistant compound biofertilizer special for corn and further relates to a preparation method of the disease-resistant compound biofertilizer special for the corn. The disease-resistant compound biofertilizer special for the corn comprises carbamide, compound microbial agents, bran, chitosan, furfural residues, ammonium sulfate, potassium sulfate, monoammonium phosphate, rape seed cakes, manure, humic acid, sesame seed cakes, microelements, calcium superphosphate and plant ash. The nutrient elements of the disease-resistant compound biofertilizer special for the corn are balanced, microelement compositions are abundant, soil productivity and soil fertility can be improved effectively, addition of compound microbial agents can remarkably restrain main corn diseases occurring universally, the disease-resistant compound biofertilizer special for the corn is long in fertilizer efficiency, corn yield can be improved by 25 to 30 percent effectively, the corn diseases can be prevented and cured effectively, soil can be improved effectively through long-term utilization of the disease-resistant compound biofertilizer, and the disease-resistant compound biofertilizer special for the corn can play a role in the whole growth period of the corn.

The invention belongs to the technical field of the recycling of fungus chaff from edible fungus cultivation, and in particular relates to a method for preparing soil for flowers by using edible fungus chaff. In the method, dried and crushed edible fungus chaff is uniformly mixed with auxiliary raw materials, the mixed raw material is fermented, the fermented mixed raw material is subjected to pH value adjustment and sterilization, and thus the soil for flowers is obtained. In the method, processed edible fungus chaff are used as a raw material for the soil for flowers, the original various nutrients and trace elements of the fungus chaff are retained, and thick, hard and wide fibers in the fungus chaff become short, loose and soft after the fermentation; and thus, the method improves the aggregate structure, organic matter content and fertility level of the soil, makes the nutrition of the soil for flowers more balance, contributes to the growth of flowers and trees, as well as promotes the improvement in the resistance against diseases and the quality of flowers.

The invention relates to a comprehensive improving method for coastal saline soil. The method includes the steps as follows: 1) underground desalting; 2) improvement of soil physical structure; 3) salt leaching by a great quantity of water; 4) application of microorganism bacterial manure for soil improvement; and 5) plant arrangement and transplantation. The engineering patent technology of desalting using covered conduits, the technical measures for improving the soil physical structure and the improvement of microbial manure are firstly integrated by the comprehensive improving method so as to conduct sequential and comprehensive work. The comprehensive improving method is remarkable in the effect of soil improvement and has the advantages of effectively reducing the salt content in high saline-alkali soil in short time (within one growing season), preventing secondary alkalization, increasing soil fertility and establishing microorganism communities; beneficial microorganisms relieve the threat and the harm of salt and alkali to plants in the original saline soil, accelerate soil ripening and promote the greening progress of the original soil; and the survival rate of plants in the same year is up to above 95% and the water resource is saved.

The invention discloses a saline-alkali soil improvement method. The saline-alkali soil improvement method comprises the following steps: a step I of leveling and cultivating, wherein the saline-alkali soil is firstly leveled and then deeply cultivated by 40 centimeters by virtue of deep-ploughing machinery; after being diluted by 100 times with water, green manure nutrient liquor brewed by a three-in-one leavening agent is used for irrigation; a step II of applying fertilizer and cultivating, wherein aeolian sandy soil easily obtained locally is uniformly scattered on the surface of primarily leveled and cultivated soil; a step III of preparing rectangular pieces of land in a field and planting, wherein planting ridge rectangular pieces of land in the field are designed and manufactured; a step IV of subsequently governing, wherein measures of not using fertilizers and substances which are not chemically synthesized in early-stage, middle-stage and later-stage filed management processes after the plants are planted, not watering and uninterruptedly irrigating the green manure nutrient liquor are taken. The saline-alkali soil improvement method disclosed by the invention can be used for strengthening soil fertility, and changing physical and chemical properties and microbial activity of the soil.

The invention discloses a method for improving seriously saline-alkali land of an oasis area and planting a high-quality lawn, which relates to a soil improving method and the technical field of lawn planting. The method for improving seriously saline-alkali land of the oasis area and planting a high-quality lawn comprises 1 to 18 steps. The method disclosed by the invention has the advantages offast desalination, no salt accumulation in the surface soil, soil fertility improvement, water conservation, high salt absorbing efficiency of plants, and the like.

The invention discloses a soil heavy metal composite passivator with humic acid minerals and a preparation method thereof. The soil heavy metal composite passivator is prepared by humic acid mineral powder, fused calcium magnesium phosphate and quick lime according to a certain proportion. The preparation method comprises the following steps: A, preparing the humic acid mineral powder: taking humic acid raw ore, carrying out ball-milling to the humic acid raw ore, and sieving the humic acid raw ore by a 110-140-mesh sieve for standby; and B, uniformly mixing the raw material prepared in the step A, fused calcium magnesium phosphate and quick lime, adjusting the water content of the mixture to be 10% counting by H2O, and stacking the mixture for five-seven days to obtain the soil heavy metal composite passivator with the humic acid minerals, so that the operation is simple and the method is easy to implement. By the invention, the available cadmium content of red sand mud soil with thefull-cadmium content of 10mg / kg (by exogenous adding) is reduced by 0.36-2.25mg / kg within ninety-day culture time, the reduction amplitude reaches up to 4.7-25.7%, the efficiency of the soil heavy metal composite passivator with the humic acid minerals under a water condition of 45% WHC (Water-holding Capacity) is better than that under a flooded condition, and the soil heavy metal composite passivator with the humic acid minerals also has the functions of passivating heavy metal in soil, soil fertility and the like and has significant popularization and application values in vast heavy metalpollution regions.

The present invention relates to one kind of organic soil conditioner prepared with city sludge and its production process. The material for the organic soil conditioner consists of dewatered sludge from city domestic sewage 53-72 wt%, organic agricultural waste 4-18 wt%, inorganic supplementary material 2-15 wt%, fertilizer balancing agent 1-5 wt%, and composite microbes 0.5-2 wt%. The production process of the organic soil conditioner includes the following steps: 1. fermenting the dewatered sludge from city domestic sewage, the organic agricultural waste and the inorganic supplementary material with saccharomycetes; 2. inoculating the composite microbes to the first fermented product for secondary decaying; and 3. sieving and packing to produce the organic soil conditioner. The organic soil conditioner has high nutritious component content, and can improve physical and chemical structure of soil, improve agricultural product quality and raise soil fertility.

The invention provides a biomass charcoal-based organic fertilizer and a preparation method thereof. The biomass charcoal-based organic fertilizer comprises, by weight, 30 to 60 parts of biomass charcoal, 10 to 30 parts of mould-free chicken manure, 5 to 10 parts of bone meal, 6 to 11 parts of bentonite, 2 to 5 parts of refined wood vinegar liquid, 2 to 4 parts of a trace element additive and 0.5 to 1 part of a beneficial bacterial agent. Usage of the biomass charcoal-based organic fertilizer is beneficial for improving water-retention and fertility-retention capability of conventional soil, effectively enhancing soil fertility and purifying the growing environment of crops.

The invention discloses a controlled-salinity cultivation method for plating crop on moderate and medium and severe saline-alkali soil, comprising: before sowing, irrigating saline-alkali soil for pressing salt and making soil moisture with fresh water; applying base fertilizer based on the principal of organic fertilizer into the saline-alkali soil; meanwhile, applying compound fertilizer suitable for the saline-alkali soil as the assistant material; then, ploughing soil, and raking with a leveller to preserve soil moisture; furrowing and making a ridge; covering films and sowing on the high position of the ridge; carrying out close planting; and spraying growth regulator. The cultivation method has the advantages of strong adaptability and high crop output, can be used for improving the utilization ratio of the fertilizer, quickeing the soil fertility cultivation process and bringomg high agricultural use benefits.

The present invention provides an environmentally friendly breeding method of ricefield eels and loaches, belonging to the stereoscopic environmentally friendly agriculture development mode and the matching technology. The technical scheme for solving the problem is as follows: 1, rice field construction; 2, rice field fertilization; 3, rational pesticide application; 4, breeding the ricefield eels and the loaches; 5, feeding management; 6, the ricefield eels and the loaches recapturing; 7, escape-proof technology of the ricefield eels and the loaches. The method has the following beneficial effects: 1, the rate of output is high; the annual rate of output of the ricefield eels and the loaches in each area unit is more than 1 / 3; 2, the management is convenient; the ricefield eels and the loaches can be placed simply, namely, only the seeds need to be placed into the rice field and the earthworms need to be placed on the ridge; 3, the economic benefit is good: the net profit of the ricefield eels and the loaches in the rice field in each area unit can be more than 3000 Yuan; 4, the environmentally protection effect is good, the soil can be loose and the soil fertility can be enhanced; simultaneously, with lots of organic fertilizers, the dosage of the chemical fertilizer is reduced and there is no need for the pesticide such as organic phosphorus.

The invention belongs to the technical field of heavy metal pollution soil restoration, and particularly relates to a soil heavy metal passivator, a preparation method thereof, and a passivation method thereof on soil cadmium. The soil heavy metal passivator provided by the invention is prepared from the following materials in parts by weight: 30 to 50 parts of modified alkali minerals, 10 to 15 parts of rotten agriculture and forestry wastes, 1 to 10 parts of soil conditioners, 1 to 5 parts of pH sensitive gel, 1 to 5 parts of phosphogypsum, and 0.1 to 5 parts of graphene. The soil heavy metal passivator provided by the invention has stronger adsorbing and chelating functions, can effectively fix heavy metal cadmium in the soil, and prevents effective cadmium from entering into crops; regulation can be carried out according to the soil pH, so that the utilization ratio and the long-term stability of the soil heavy metal passivator are improved; meanwhile, with an added soil conditioner, the soil environment can be improved, and the soil fertility is improved. The passivator provided by the invention can better meet the urgent demand of heavy metal pollution soil restoration in China currently on strong stability, no secondary pollution, and durable and stable effect.

The invention relates to a fertilizer and a process for preparing the same, in particular to a green organic crop microorganism fertilizer. The microorganism fertilizer is characterized in that the microorganism fertilizer is prepared by the mix-fermentation of eight bacterial communities of photosynthetic bacteria, azotobacter, actinomycete, lactobacillus, yeast, root fixing bacteria, potassium bacteria and phosphorus bacteria, a plurality of beneficial microbial agents, coal gangue powder, lignite, straw carbon, humic acid, crop straw powder and excrement. Tests show that the microorganism fertilizer has obvious effect on the growth of corn, broomcorn, cereal, legume, paddy rice, fruits, flowers, pasture and the like, the production increasing rate is between 15 and 30 percent, and the microorganism fertilizer has obvious function on resisting diseases, lodging and insects, and can replace pesticide, fertilizer and hormone, avoid chemical pollution, improve soil fertility and product quality, and make the product become green or organic standards; and particularly, various crop straw and excrement are used as a carrier, thereby further lowering cost of the microorganism fertilizer and opening up a new path for the popularization and application of the microorganism fertilizer.

The invention relates to a biological organic fertilizer, and particularly relates to an efficient biological organic fertilizer made from yellow mealworm fecula sand, aiming at solving the existing problems that noxious substances such as heavy metals, nitrate and nitrite in soil and crops are aggregated because of using chemical fertilizers in a large scale in agricultural production, thus being prejudicial to the body health of human, depleting soil and the like. The efficient biological organic fertilizer is made from yellow mealworm fecula sand, chicken manure and clay, wherein a mixture is made from 50-70 parts of yellow mealworm fecula sand and 30-50 parts of fermented chicken manure, then 60-65 parts of the mixture and 35-40 parts of clay are mixed to prepare the efficient biological organic fertilizer; the efficient biological organic fertilizer is stable, durable and long-acting in fertility, and capable of improving soil activity after being applied; the efficient biological organic fertilizer has a micro-ecological balance function and a good water-retention function; and soil fertility can be improved, crop yield can be increased, agricultural product quality can be improved, agricultural production cost can be reduced, soil structure can be improved, agricultural ecological environment can be improved, and the sustainable development of the planting industry can be promoted.

The invention provides a method for repairing microorganisms in heavy metal contaminated soil, specifically comprising the following steps of: step 1, separating rhodobacter sphaeroides; step 2, culturing the rhodobacter sphaeroides; and step 3, using the rhodobacter sphaeroides to repair the heavy metal contaminated soil. By means of the method for repairing the microorganisms in the heavy metalcontaminated soil provided by the invention, the existence shapes of heavy metals in the soil can be improved effectively; and the plant accumulations of the heavy metals are greatly reduced. The method for repairing the microorganisms in the heavy metal contaminated soil disclosed by the invention belongs to in-situ repairing and has the advantages of simple operation, low cost and good repairing effect. Furthermore, the soil fertility is not damaged; and the secondary contamination of the environment does not exist.

The invention discloses a special improved organic fertilizer for saline-alkali soil. The special improved organic fertilizer comprises the following components by weight: 89%-91% of straw organic fertilizer, 7%-9% of saline-alkali soil modified material, and 1%-3% of medium-micro element additive. The invention further discloses a preparation method for the special improved organic fertilizer for saline-alkali soil. The preparation method comprises the following steps: mixing and piling 89%-91% of the straw organic fertilizer, 7%-9% of the saline-alkali soil modified material, and 1%-3% of the medium-micro element additive by weight to be long strips; uniformly stirring the long strips by a turner, adding hydrolytic polymaleic anhydride organic aqueous solution, and regulating the pH of the solution to be 3-4 to obtain the special improved organic fertilizer for saline-alkali soil. The special improved organic fertilizer for saline-alkali soil can effectively improve soil hardening, increase micro elements and organic nutritional ingredients of humic acid in the saline-alkali soil and improve quality of humus, thereby improving soil fertility and achieving survival rate of planted seedling of more than 95%.

The invention discloses preparation and an application for a heavy metal chromium contaminated soil remediation material. Preparation for biological carbon particles comprises the following steps: 1) cleaning, drying and crushing agriculture waste to obtain a substance A; and 2) placing the substance A under a protective atmosphere to deoxidize and carbonize, and grinding and sieving carbonize products to obtain the biological carbon particles. Preparation for supported type nano zero-valent iron particles comprises the following steps: 1) preparing ferrite into a solution; 2) adding biological carbon particles into the solution, and uniformly mixing the biological carbon particles with the solution; and 3) dissolving a reducing agent into a solvent to obtain a mixture, adding the mixture into the system in the last step under the protective atmosphere, stirring the mixture, sufficiently reacting the mixture, separating nano zero-valent iron, washing, drying and grinding the nano zero-valent iron to obtain the supported type nano zero-valent iron particles. The invention further discloses the application of the supported type nano zero-valent iron particles to remediating chromium contaminated soil in situ. The in-situ remediation method for the heavy metal chromium contaminated soil comprises the following steps: adding the supported type nano zero-valent iron particles into soil, uniformly mixing the supported type nano zero-valent iron particles, adding deoxygenated water, and carrying out remediation. The remediation material prepared by the preparation disclosed by the invention is high in efficiency of remediating the chromium contaminated soil, and capable of improving the soil structure and improving the soil fertility.

The invention relates to a biochar soil conditioner and a preparation method thereof. The soil conditioner is prepared from, by weight, 2-10 parts of biochar, 1-5 parts of pyroligneous liquor, 5-10 parts of composite microorganisms, 3-5 parts of binder and 4-10 parts of organic matter. The soil conditioner can maintain soil fertility by means of the adsorption effect of biochar, adsorb nitrogen, phosphorus and potassium in soil, promote the activity of microorganisms in the soil and microorganism decomposition, improve the soil porosity, reduce the soil bulk density, increase the soil permeability, solve such problems as soil fertility loss and poor physical and chemical properties, effectively solve such a phenomenon as soil acidification, improve the quality of agricultural products, promote early ripening of crops, and increase the yield of the crops.

The invention discloses a remediation method for soil contaminated by heavy metal. Heavy metal absorbents are applied to the contaminated soil, collecting gutters are constructed in the periphery of the soil contaminated by the heavy metal, acid elution solutions are sprayed on the surface of the soil contaminated by the heavy metal after heavy metal passivators are applied until the measured content of the heavy metal in the soil contaminated by the heavy metal does not change, the soil contaminated by the heavy metal is washed by clean water until the soil is neutral, and then conditioners and improvement agents for the soil contaminated by the heavy metal are applied. According to the remediation method, the collecting gutters are constructed in the periphery of the soil contaminated by the heavy metal, impermeable films are laid on the bottoms of the collecting gutters, and therefore the heavy metal in the soil contaminated by the heavy metal can be prevented from being leaked or diffused to the deeper part of the soil; one collecting tank can be shared by a plurality of pieces of soil contaminated by the heavy metal, and therefore the resources can be saved; calcium, magnesium, silicon, potassium, phosphorus, iron, manganese, zinc, boron and molybdenum lost from the soil can be supplemented by the improvement agents and the conditioners, and therefore the soil fertility can be improved.