46results about How to "Yield has no effect" patented technology

The invention discloses a method for interplanting Hunan polygonatum odoratum under camellia oleifera forest, and relates to the field of economic forestry planting technologies. The method includes planting procedures of firstly, selecting interplanting camellia oleifera forest lands; secondly, preparing the interplanting forest lands; thirdly, preparing to-be-planted forest lands, to be more specific, (1) fertilizing the to-be-planted forest lands and (2) furrowing the forest lands; fourthly, carrying out pre-plant preparation, to be more specific, (1) selecting seeds and (2) digging planting ditches; fifthly, planting the Hunan polygonatum odoratum, to be more specific, (1) determining the planting time and (2) planting the Hunan polygonatum odoratum; sixthly, carrying out management, to be more specific, (1) carrying out management in first growth years and (2) carrying out management in second growth years; seventhly, carrying out harvesting. The method has the advantages that soil can be fertilized, diseases and insect pests can be reduced, soil and water loss can be prevented, the yields of camellia oleifera and the polygonatum odoratum can be increased, and the quality of the camellia oleifera and the polygonatum odoratum can be improved; the soil service cost can be lowered, and the method is applicable to interplanting the Hunan polygonatum odoratum under the recently planted camellia oleifera forest with the slope within 25 degrees and tree ages of 3-10 years and is also applicable to interplanting other sciophilous precious medicinal materials.

The invention relates to a method for recommending application rate of crop nitrogenous fertilizers based on soil nutrient balance. The method is characterized in that the field fertilizer test is carried out to establish nitrogenous fertilizer application rate X and crop nitrogen harvest index Y; the functional relation is established by software; according to the established functional relation, the value of the crop nitrogen harvest index Y is caused to be within the interval of 0.863-1; afterwards, the value of the nitrogenous fertilizer application rate X is worked out by backwards calculation and the value is used as the recommended application rate of crop nitrogenous fertilizer for the crop in the coming year. The method has the advantages that addition of the extra field fertilizer test is not needed and only rearrangement of the initial data is needed based on the launched soil testing and formulated fertilization field fertilizer test. As shown in the fertilizer response function curve of crop yield and fertilizing amount, the high yield region of the crop is a platform with very wide fertilizing amount range, the change of the fertilizer use level within the range of the platform exerts little influence on the yield. The recommended application rate of crop nitrogenous fertilizer of the invention can balance the soil nutrient and is beneficial to sustainable development of agriculture.

The invention relates to a construction method for a nitrogen and phosphorus loss system of greenhouse soil of an intercept river network area, which comprises the following steps that: an ecological canal is constructed on the earth surface of greenhouse soil, the ecological canal is formed by splicing pipes with U-shaped cross sections, the bottoms of the U-shaped pipes are poured with concrete, a side wall joint between every two U-shaped pipes is provided with a gap, and plants are planted in the gap; the bottom of the ecological canal is provided with a growth box, a growth medium is arranged in the growth box, plants are planted in the growth box, and the growth medium is coal cinder, detritus or ceramsite; the ecological canal is communicated with a water collecting tank, the water collecting tank is connected with a wetland rice field, two ends of the wetland rice field are provided with buffer zones, rice is planted in the middle zone between the buffer zones, and stored water flowing out from the water collecting tank flows into the wetland rice field through the buffer zone, and then flows out from the buffer zone at the other end of the wetland rice field. According to the invention, the load of nitrogen, phosphorus nutrient and other nutrient substances can be effectively reduced, the runoff load of the greenhouse soil is effectively reduced, and the problem of eutrophication of river network water near the greenhouse soil can be solved.

The invention researches and develops a novel catalyst capable of catalyzing the reaction of CO2 with epoxyalkane to produce cyclic carbonate at a temperature of 0 to 160 DEG C and a pressure of 0.1 to 6 MPa and a preparation and application thereof. The catalyst is a cobalt complex conjugated microporous polymer CMP[Salen-Co-R1] and has structural formulas of CMP-1, CMP-2 and CMP-3 as described in the specification; in the formulas, R1 is -OAc, -Cl, -Br or -I, and R2 is -H, -tBu, -iBu, -NO2, -Cl, -CH2NEt2 or -CH2N(Bn)Et2Br. The polymer catalyst is used to catalyze the reaction of CO2 and epoxyalkane at normal temperatures and pressures, yield of obtained cyclic carbonate is 35 to 90%, and repeated usage of the catalyst almost poses no influence to the yield; the yield is more than 90% when the reaction is carried out at a high temperature of 50 to 120 DEG C and a high pressure of 2 to 6 MPa for 1 to 3 h. According to the invention, catalysis of the reaction of CO2 with epoxyalkane is realized under mild reaction conditions, so restriction of high temperatures and pressures on the reaction is overcome; and the catalyst can be repeatedly used, so the problem of a low utilization rate of the catalyst in the prior art is overcome.

The invention relates to a recombination strain for producing trans-4-hydroxy-L-proline and building and application of the recombination strain and belongs to the technical field of genetic engineering. The recombination strain for producing the trans-4-hydroxy-L-proline is identified as escherichia coli HJ which is preserved in China Center for Type Culture Collection on September 17th, 2015, and the preservation number of the escherichia coli HJ is CCTCC No. M2015550. The recombination strain has the advantages that wild glutamate kinase controlled by feedback regulation is used to enhance expression, three to-be-expressed genes and expression elements such as related initiators are integrated to the chromosome of the escherichia coli, the to-be-expressed genes can be constantly replicated along with the replication of the chromosome, extremely-high genetic stability is kept, the problem of plasmid loss is solved, effective fermentation cycle is prolonged, and the yield of hydroxyproline is increased.

The invention discloses a method for hydrolyzing vegetable fibre by solid acid, comprising the following steps: (1) adding smashed vegetable fibre and a solid-acid catalyst into water, mixing and dissolving; (2) carrying out hydro-thermal reaction at the temperature of 140-180DEG C for 6-10 hours after the smashed vegetable fibre and the solid-acid catalyst are evenly mixed and dissolved, and obtaining hydrolysate after the reaction; and (3) filtering the hydrolysate so as to separate target objects and the solid-acid catalyst, drying filter residues so as to be directly reused, and regulating the pH value of filter liquor to be within 6-8. The invention adopts solid sulfoacid with better hydrothermal stability and larger acid value to replace liquid acid, realizes the hydrolyzation of the cellulose under the moderate condition and solves the problem that the tradition catalyst is difficult to be separated from products; and after separation, the catalyst can be recycled, thereby avoiding lower economic benefit and acid contamination caused by the loss of liquid-acid catalysts.

The invention develops novel catalysts which can be used for catalyzing the cycloaddition of CO2 and epoxy alkane at 0-160 DEG C and 0.1-6MPa to generate corresponding cyclic carbonates and a preparation method thereof. The catalysts provided by the invention are metal chromium, zinc or copper complexed conjugated microporous polymer (CMP) catalysts, wherein CMP-1 is one type of metal chromium complexed polymers, CMP-2 is one type of metal zinc complexed polymers, and CMP-3 is one type of metal copper complexed polymers; by using the polymer catalysts complexed by different metals to catalyze the reaction of CO2 and epoxy alkane at normal temperature and normal pressure, the yield of the obtained corresponding cyclic carbonates is 35-38%, the recovery of the catalysts is simple and convenient to operate, and the reuse of the catalysts can not affect the yield; meanwhile the reaction conditions are controlled, and the yield can achieve above 90% when the reaction is performed at the temperature of 50-120 DEG C and the CO2 pressure of 2-6MPa for 1-3 hours.

The invention provides an improving and variety changing method for an advanced age pear tree. The method includes the following steps that, scions are collected and placed in a nutrient solution to be kept fresh for standby use, the scions are cut flat along smooth faces, and the opposite sides of the two ends of cut faces are cut into inclined faces; a stock is trimmed and grooved; the scions are grafted to main branches or lateral branches of the stock, bundled up through hemp ropes after being grafted and closed through micropore preservative films; conventional clipping management is carried out on the pear tree, stock branches affecting scion growth are removed during winter pruning of the first year, and wound branches of the last year are removed during later winter pruning; the micropore preservative films are broken during a budding period in early spring to expose bud holes, and germinal latent buds are removed in the early spring. According to the grafting method, the influence on scion grafting in the current year is small, the survival rate of the grafted branches is high, the single bud grafting amount is large, and a great deal of manual work can be saved; the grafting method does not affect the pear yield in the next year, and the yield is increased by 31.2% compared with a traditional grafting method.

The invention discloses a planting method of high yield gastrodia elata and relates to the technical field of gastrodia elata planting. The method comprises the following steps of 1, site selection and soil preparation; 2, planting groove digging; 3, gastrodia elata seed cultivation; 4, planting; 5, harvesting. The planting method of the high yield gastrodia elata saves labor, time and resources, the investment cost is lowered, and the gastrodia elata with high quality and high yield can be obtained.

The invention discloses a safe rice production method applied to soil with medium and mild cadmium contamination. The method comprises steps that (1), a passivator is sprayed to the soil surface of arice field, and ploughing is performed until the passivator and soil are mixed uniformly; (2), a zinc-containing compound is taken as an antagonistic element, the antagonistic element is applied during application of the passivator, the zinc-containing compound is also required to be dissolved in irrigation water at a booting stage and a grain-filling stage of rice in the rice field with medium Cadmium contamination, and then the rice field is irrigated; (3), a foliar inhibitor is applied once at a tillering stage or the grain-filling stage of rice in the rice field with mild cadmium contamination, and the foliar inhibitor is applied once at the tillering stage and the grain-filling stage of rice in the rice field with medium cadmium contamination; and (4), a part of passivator and the antagonistic element zinc are applied supplementarily to continuous multi-season rice according to actual conditions before planting, and the foliar inhibitor is sprayed every season. According to the safe rice production method, cadmium content of rice can be remarkably reduced, the operating method is simple and convenient, the effect is stable, and the rice yield is not affected.

The invention discloses a preparation and purification method for 2-tert-amylanthraquinone. The method includes: subjecting phosphorus pentoxide and trifluoroacetic acid to mixed heating to certain temperature, dissolving 2-(4'-tert-amylbenzoyl)benzoic acid (called ABB acid for short) with a solvent and then adding the product dropwise into the mixed phase, performing mixing and then carrying out reaction at certain temperature, at the end of the reaction, pouring the reaction liquid into cold water, conducting standing and layering, collecting the oil layer, then adding a certain amount of an adsorbent for adsorption of tar impurities at certain temperature, then performing filtering, and subjecting the filtrate to distillation crystallization, thus obtaining a high purity 2-tert-amylanthraquinone product. The method provided by the invention has the advantages of mild reaction conditions, simple operation, few side reaction, and recyclability of adsorbent, and lowers the separation cost.

The present invention discloses a paddy safety production method for paddy field soil with the moderate-severe cadmium pollution. The method comprises the steps of (1) throwing a passivation agent onthe surface of the paddy field soil, performing turnover until the passivation agent is uniformly mixed with the soil, keeping the water content of the paddy field soil at 60% or above after application of the passivation agent, and performing balance culture for 3-7 days; (2) applying a silicon compound-containing antagonistic element by a method of performing basal application of the half amountbefore paddy planting and performing additional application of the rest half amount in a paddy booting stage; and (3) spraying a leaf surface blocking control agent once in each of the paddy bootingearly stage and filling stage, wherein the leaf surface blocking control agent is prepared by mixing a silicon compound, a surfactant and water. The paddy safety production method can obviously reducethe content of cadmium in paddy rice, the operation method is simple and convenient, and the effect is stable.

The invention provides a method for producing L-pyroglutamic acid bivalent alkaline earth metal salt. In the method, water is taken as a solvent, L-pyroglutamic acid is reacted with a bivalent alkaline earth metal carbonate, a bivalent alkaline earth metal oxide or an alkaline earth metal hydroxide under normal pressure, and high-yield solid, white and high-purity L-pyroglutamic acid bivalent alkaline earth metal salt is obtained through evaporation under reduced pressure.

The invention discloses a wheat grain zinc and selenium synchronous enrichment method. Winter wheat serves as a research object and is sprayed 7 days after blooming, the zinc and selenium enrichment effect of wheat grains after zinc and selenium are cooperatively sprayed is discussed, the purpose is to increase the selenium content of the wheat grains while the zinc content of the grains is not affected, and a certain theoretical basis can be provided for practically and effectively achieving simultaneous zinc and selenium enrichment of the wheat. The method has the following conclusions that(1) the yield of the wheat is not influenced by zinc and selenium matched spraying; (2) the zinc content of the grains does not reach a zinc-rich standard without selenium spraying processing, the selenium content of the grains does not reach a selenium-rich standard without zinc spraying processing, and the zinc and selenium in the wheat grains achieve an enrichment effect after zinc and the selenium are cooperatively sprayed, and (3) the phytic acid / zinc molar ratio can be remarkably reduced after the zinc and the selenium are cooperatively sprayed, the zinc effectiveness of grains is improved, and meanwhile, the biological effectiveness of the selenium is not influenced. Therefore, under the condition of a potential zinc deficiency and low selenium soil, zinc and selenium can be cooperatively sprayed on leaf surfaces for zinc and selenium synchronous biological enhancement of the wheat grains.

A method for preparing succinic anhydride through dehydration of amber acid under the catalysis of alkaline-earth metal hydroxide or alkaline-earth metal sulfate is characterized by comprising the following steps: taking alkaline-earth metal hydroxide or alkaline-earth metal sulfate as a catalyst, wherein the mass ratio of amber acid to the catalyst is (50 to 500):1, the mass ratio of amber acid to a solvent is 1:(1 to 10), the reaction temperature is 150 to 230 DEG C, and the reaction time is 1.0 to 10.0 hours; recovering the solvent for reutilization. Compared with the prior art, the method has the advantages that 1, the catalyst is wide in source and low in cost, and the reaction rate is high; 2, the product post-treatment is simple, and the purity of the obtained succinic anhydride as well as the yield is high; 3, the solvent is convenient to recover and can be used repeatedly without impacting the productivity seriously.

The invention discloses a fluorine containing sulfonylimine spiro quaternary ammonium salt electrolyte. The structural formula of the electrolyte is represented in the description, in the structural formula, n is 1 or 2; and Y<-> represents one of N(SO2F)2<->, N(SO2CF3)2<->, N(SO2C2F5)2<->, N(SO2F)(SO2CF3) <->, and N(SO2OCH2CF3)2<->. The invention also discloses a preparation method of the electrolyte and an application of the electrolyte in a super capacitor. The provided electrolyte has an excellent performance, and has an excellent electrochemical performance at an extremely low temperature(-40 DEG C) when being taken as the electrolyte of a super capacitor. The preparation method is green and environmentally friendly.

The invention discloses a direct-feeding type asphalt warm-mixing material. The direct-feeding type asphalt warm-mixing material is a mixture of a copolymer of polyethylene wax-maleic anhydride and zeolite powder. The preparation method of the direct-feeding type asphalt warm-mixing material comprises the following steps: (1) preparing the copolymer of polyethylene wax-maleic anhydride; (2) weighing the copolymer of polyethylene wax-maleic anhydride and mixing with the zeolite powder to obtain the target product. By adopting the warm-mixing material, the construction workability of the asphalt mixture can be effectively improved, the temperatures of the asphalt mixture during the mixing, paving and grinding processes are 20-40 DEG C lower than those of the traditional hot-mix asphalt mixture, and each index of the warm-mixing material can reach the performance index of the traditional hot-mix asphalt mixture. By adopting the warm-mixing material provided by the invention, special added equipment is not needed, the production is convenient, and the yield of an asphalt mixing plant is not influenced.

The invention discloses a method for controlling the phosphorus content of molten steel in a tapping weak deoxidation mode. By controlling the basicity, oxidability and temperature of the slag in the converter blowing process and at the blowing end point (the basicity R of the slag at the blowing end point is 3.2-4.0, the end point temperature T is 1620-1650 DEG C, the carbon content is 0.04-0.06 wt%, and the oxygen content in the molten steel at the end point is 500 ppm-700 ppm), process dephosphorization is achieved to the maximum extent, later rephosphorization is prevented, P in the molten steel is controlled to be at a low level, double-slag-stopping operation is adopted during tapping, weak deoxidation alloying (the adding amount of aluminum blocks is about 2 / 3 of the target using amount of steel types) is conducted in the later period of tapping, high argon is used for intense stirring and high oxygen partial pressure is used for flushing and mixing dephosphorization, the good flowability of top slag is kept, and steel ladle dephosphorization is achieved as much as possible; and slagging-off is conducted after tapping, so that the rephosphorization probability and the total mass of phosphorus are further reduced, and the cleanliness of molten steel and the quality of casting blanks are improved.

The invention relates to a method for preparing high-purity acetylacetonatodicarbonyl rhodium through using rhodium trichloride. The method comprises the following steps: mixing rhodium trichloride containing metal impurities with N,N-dimethyl formamide and acetylacetone, heating to reaction completeness, cooling the obtained reaction solution to room temperature, adding deionized water, filtering the obtained precipitate, washing the precipitate to obtain crude acetylacetonatodicarbonyl rhodium, dissolving the crude acetylacetonatodicarbonyl rhodium in a sufficient amount of an organic solvent, washing the obtained organic phase by an aqueous solution of disodium ethylene diamine tetraacetate twice, and washing the organic phase by water once to obtain an acetylacetonatodicarbonyl rhodium solution. The method which adopts the acetylacetonatodicarbonyl rhodium containing the metal impurities as a reaction raw material enables the rhodium recovery process to be substantially shortened, so the production cost is reduced, and the economic benefit of the method is large.

Provided is a simple oil field wellhead associated gas collection device. The simple oil field wellhead associated gas collection device includes a cover side suction check valve, a cover side exhaustcheck valve, an axis side suction check valve, an axis side exhaust check valve, a steel piston gas cylinder, a piston, a power source, an upper connection rod, a connection rod position adjusting device, a cylinder bottom sewage draining valve, corresponding pipelines and the like, wherein the inlet of the cover side suction check valve is connected with a Christmas tree sleeve pipe outlet sluice valve, and the outlet of the cover side suction check valve is connected with the cover side gas inlet of the steel piston gas cylinder; the inlet of the axis side exhaust check valve is connected with the axis side exhaust hole of the steel piston gas cylinder, and the outlet of the axis side exhaust check valve is connected with the associated gas collection pipeline; a sewage draining port isformed in the bottom of the steel piston gas cylinder, and the cylinder bottom sewage draining valve is mounted at the sewage draining port. The simple oil field wellhead associated gas collection device has the advantages that discharging of pollutants is reduced; the oil field wellhead associated gas collection device is simple in process, convenient to mount, easy to maintain and low in investment and operation cost and can be produced on site; single action and double action can be flexibly switched; the compression ratio is large in range and adjustable; no extra power supply is requiredfor driving; the oil field wellhead associated gas collection device is applicable to continuous, intermittent and other working conditions and is suitable for associated gas collection when sleeve pressure is lower than return pressure.

The invention belongs to the technical field of crop breeding, and provides an isolation and purification method for Chenopodium quinoa, and aims at solving the problems that Chenopodium quinoa growsmildew easily, the grains are not full and the Chenopodium quinoa is sterile at high temperature. A nonwoven fabric material is made into an isolation bag with a closed bottom, an opening at the upperend of the isolation bag is provided with a contraction rope, and two sides of the isolation bag are provided with cellophane observation windows; during the florescence of Chenopodium quinoa, branches and leaves were removed from top to bottom, and 2-3 cm of a trunk is exposed; the top end is sleeved with the isolation bag; after the top end is sleeved for 15-20 days, main ears fully fill the bag, the isolation bag is removed, pruning is performed downwards from the top end to remove branches and leaves and expose 2-3 cm of the trunk, secondary sleeving is performed; after the bag is changed, the bag is removed according to the flowering period, the single plant with the main ears sleeved are harvested in the mature period. The structure and method have no influence on the grain fullnessand the yield of Chenopodium quinoa, and can meet the requirements of subsequent research on the seed quantity. The problems that the inflorescences easily grow mildew during isolation and purification sleeving so that the seed setting amount is low, the grains are not full and sterility is caused due to the high temperature are solved.

The invention relates to a method for separating starch and cellulose in potato dregs in advance, and then carrying out enzymolysis on the starch and carrying out solid acid hydrolysis on the cellulose to prepare reducing sugar. The method comprises the following steps: firstly, removing soluble starch and solid impurities in the potato dregs through a water washing method and a water boiling method, then carrying out enzymolysis on the starch in the potato dregs by adopting middle-temperature alpha-amylase and pullulanase to prepare the reducing sugar, wherein the yield of the reducing sugar is greater than 60%, and finally, by taking ionic liquid as a solvent, and taking the laboratory home-made chitosan-based solid acid (has been patented) as a catalyst, magnetically stirring the potato dregs containing the cellulose at 120-150 DEG C under normal pressure, thus preparing the reducing sugar with high concentration, wherein the yield of the reducing sugar is greater than 45%. In the implementation of the method, few equipment is needed, the operation process is simple, the condition is mild, the environmental protection purpose is achieved, the energy consumption is low, the cost is low, the amount of by-products is small, the yield of the reducing sugar is high, the utilization of the potato dregs can be realized to the greatest extent, and therefore, the method is one of the optimum schemes for development and utilization of the potato dregs.

The invention discloses a preparation process of nano cobalt powder. The preparation process comprises the following steps that a reducing agent is added into a cobalt salt solution, and a cobalt powder seed crystal solution is prefabricated; a nitrogen-hydrogen mixed gas is blown into the prefabricated cobalt powder seed crystal solution, and a reduction mother solution containing the nano cobalt powder is obtained; and the reduction mother liquor is separated, and the nano cobalt powder is collected. The defect that a traditional liquid phase hydrogen reduction reaction must be carried out at high temperature and high pressure is overcome, the prepared nano cobalt powder is spherical particles, the particle size of a single particle ranges from 300 nm to 700 nm, the particle size is uniform, and the nano cobalt powder has good dispersity and liquidity and can be widely used for preparing various superfine hard alloy tools.

The invention researches and develops a novel catalyst capable of catalyzing the reaction of CO2 with epoxyalkane to produce cyclic carbonate at a temperature of 0 to 160 DEG C and a pressure of 0.1 to 6 MPa and a preparation and application thereof. The catalyst is a cobalt complex conjugated microporous polymer CMP[Salen-Co-R1] and has structural formulas of CMP-1, CMP-2 and CMP-3 as described in the specification; in the formulas, R1 is -OAc, -Cl, -Br or -I, and R2 is -H, -tBu, -iBu, -NO2, -Cl, -CH2NEt2 or -CH2N(Bn)Et2Br. The polymer catalyst is used to catalyze the reaction of CO2 and epoxyalkane at normal temperatures and pressures, yield of obtained cyclic carbonate is 35 to 90%, and repeated usage of the catalyst almost poses no influence to the yield; the yield is more than 90% when the reaction is carried out at a high temperature of 50 to 120 DEG C and a high pressure of 2 to 6 MPa for 1 to 3 h. According to the invention, catalysis of the reaction of CO2 with epoxyalkane is realized under mild reaction conditions, so restriction of high temperatures and pressures on the reaction is overcome; and the catalyst can be repeatedly used, so the problem of a low utilization rate of the catalyst in the prior art is overcome.

A corn stalk feed production method relates to a method for harvesting high-quality corn stalk feed, which obtains the high-quality corn stalk feed without decreasing the corn grain yield and even in the case of increasing the production yield. The invention solves the problem of forage shortage. The method comprises the following steps: in the stage of wax ripeness (within 40 days) of the corn growth and development, the top end of the plant is cut off at a 2-3mm distance from the leaf ring of the upper leaf (or two leaves) above the ear leaf and / or the corn leaves below the ear leaf (or the lower leaf below the ear leaf) are removed to serve as the corn stalk feed. In the invention, the crude protein content of the straw reaches 5%-9%, and the yield is up to 1.42-2.23 t / ha. The method has simple process and low investment, which is easy to grasp and promote; therefore, the invention provides a new approach for farmland management and healthy grassland maintenance, which alleviates the conflict between grass and livestock and provides a high-quality feed resource for the livestock production.

The invention discloses a method for enriching zinc of wheat grains through combined spraying of the zinc and pesticides. According to the method, winter wheat is used as a research object, a mixed solution of the zinc, the pesticides and biological stimulants is sprayed 7 days after flowering, the zinc enrichment effect of the wheat grains after the combined spraying of the zinc, the pesticides and the biological stimulants is studied, and a certain theoretical basis is provided for practical realization of an efficient grain zinc enrichment technology. The method has the advantages that thecombined spraying of the zinc and the pesticides does not affect the yield of the wheat; in the later growth stage of the wheat, the zinc content of the wheat grains can be significantly increased through the combined spraying of zinc fertilizer and the pesticides; after the combined spraying of the zinc and the pesticides, the molar ratio of phytic acid to the zinc can be significantly reduced, and the effectiveness of the zinc in the grains is improved; under the potential condition of the soil short of the zinc, the combined spraying of the zinc, the pesticides and the biological stimulantsis an efficient agronomic measure that meets the requirements for zinc enrichment of the grains and the control of pests and diseases.

The invention discloses a method for interplanting Hunan polygonatum odoratum under camellia oleifera forest, and relates to the field of economic forestry planting technologies. The method includes planting procedures of firstly, selecting interplanting camellia oleifera forest lands; secondly, preparing the interplanting forest lands; thirdly, preparing to-be-planted forest lands, to be more specific, (1) fertilizing the to-be-planted forest lands and (2) furrowing the forest lands; fourthly, carrying out pre-plant preparation, to be more specific, (1) selecting seeds and (2) digging planting ditches; fifthly, planting the Hunan polygonatum odoratum, to be more specific, (1) determining the planting time and (2) planting the Hunan polygonatum odoratum; sixthly, carrying out management, to be more specific, (1) carrying out management in first growth years and (2) carrying out management in second growth years; seventhly, carrying out harvesting. The method has the advantages that soil can be fertilized, diseases and insect pests can be reduced, soil and water loss can be prevented, the yields of camellia oleifera and the polygonatum odoratum can be increased, and the quality of the camellia oleifera and the polygonatum odoratum can be improved; the soil service cost can be lowered, and the method is applicable to interplanting the Hunan polygonatum odoratum under the recently planted camellia oleifera forest with the slope within 25 degrees and tree ages of 3-10 years and is also applicable to interplanting other sciophilous precious medicinal materials.

The invention discloses a preparation method for dried tremella. The preparation method comprises the following steps: 1) harvesting: stopping watering for 2.5-3.5h before harvesting, thereby guaranteeing water content of tremella below 95%; selecting mature tremella in size of 4cm-5cm and removing impurities; 2) pre-cooling: sealing and pre-cooling for 1.5-3h at 0-4 DEG C; 3) drying: uniformly paving and placing tremella in a single layer, drying for 2.5-6h at 35-65 DEG C till water content of tremella is less than or equal to 14%, stopping heating and cooling to room temperature; 4) sealing:split-charging the cooled dried tremella, and then sealing, thereby acquiring the dried tremella. According to the drying method provided by the invention, processing time is short, efficiency is increased and product quality is not influenced; through detection, the product of dried tremella acquired by drying has an excellent color character; drying temperature has no influence on the yield ofdried tremella.

The invention discloses a planting method of young pear trees in the technical field of fruit and vegetable planting, and aims at solving the problems that the existing young pear tree period is long, and tree bodies grow slowly. The method comprises the following steps of 1, seedling selection, wherein pear seedlings of which the trunk diameters are 1 cm or above are selected; 2, root soaking, wherein roots of the pear seedlings are put into an ABT rooting solution to be soaked for 2 h to 5 h; 3, planting, wherein the pear seedlings are planted, the peripheries of the pear seedlings are covered with mulching film, and broad beans are interplanted; 4, fertilization, wherein the mulching film is removed after planting is conducted for 20 days to 35 days, and decomposed organic fertilizer and phosphorus bacteria fertilizer are applied; 5, branch drawing, wherein pinching is conducted after first-time shoot growth of the young pear trees is achieved for 5 days to 7 days, branches with shoots are drawn to be in an arch shape, and the same branch drawing treatment is conducted after second-time shoot growth of the pear seedlings is achieved; 6, top dressing, wherein basic fertilizer is applied in May every year, and foliar fertilizer is sprayed when the young pear trees germinate. The planting method of the young pear trees can promote growth and development of the young pear trees, trunks of the young pear trees are thick and strong, branches and leaves are luxuriant, the young pear tree period can be controlled to be within 2 years, and the planting time is shortened.

The invention relates to a method for preparing high-purity acetylacetonatodicarbonyl rhodium through using rhodium trichloride. The method comprises the following steps: mixing rhodium trichloride containing metal impurities with N,N-dimethyl formamide and acetylacetone, heating to reaction completeness, cooling the obtained reaction solution to room temperature, adding deionized water, filtering the obtained precipitate, washing the precipitate to obtain crude acetylacetonatodicarbonyl rhodium, dissolving the crude acetylacetonatodicarbonyl rhodium in a sufficient amount of an organic solvent, washing the obtained organic phase by an aqueous solution of disodium ethylene diamine tetraacetate twice, and washing the organic phase by water once to obtain an acetylacetonatodicarbonyl rhodium solution. The method which adopts the acetylacetonatodicarbonyl rhodium containing the metal impurities as a reaction raw material enables the rhodium recovery process to be substantially shortened, so the production cost is reduced, and the economic benefit of the method is large.