316 results about "CALCIUM/MAGNESIUM/PHOSPHORUS" patented technology

The invention relates to an organic environmentally-friendly soil conditioner for improving acidified or acid soil and a preparation method thereof. The soil conditioner is prepared from the following raw materials in parts by weight: 23-46 parts of biogas residue, 14-24 parts of shell powder, 16-25 parts of calcium magnesium phosphate fertilizer, 13-20 parts of plant ash, 0.1-0.2 part of chitosan, 5-7 parts of zeolite powder and 6-9 parts of bentonite. The soil conditioner is prepared through pretreatment of the biogas residue, pretreatment of the shell powder and the like; through the produced soil conditioner, the pH value of soil can be increased; nutritive elements such as calcium, magnesium, phosphorus, potassium and the like in the soil are increased; the organic matter content in the soil is increased; the water retention and fertilizer retention capacity of the soil is improved; the physicochemical property of the soil is improved; the antiretroviral (diseases, pests, drought and the like) capacity of crops is improved; heavy metal poison is reduced; and the soil conditioner is convenient to apply, is not influenced by wind power and is suitable for mechanical working.

The invention relates to the crop growing field, particularly relates to a soil improver taking biomass particle carbide discarded in agriculture and forestry as a matrix and a preparation method thereof. The carbon-base soil improver comprises biomass particle charcoal, calcium magnesium phosphate or calcined lime, and binder, and also comprises other fertilizers, such as urea, monoammonium phosphate powder, potassium chloride, zinc sulfate, boricfertilizer, manganese sulfate, ammonium molybdate, ferrous sulfate and copper sulfate and the like. The biomass particle charcoal is a black powdered carbon particle (carbon soot) generated by incomplete combustion of the biomass under hypoxemia condition, has various properties similar with soil humus (acid) and strong ability to absorb and maintain nutrients, such as nitrogen, phosphorus and potassium and the like, and has obvious water retention and moisture preservation effects. The soil improver prepared by the preparation method has the characteristics of soil structure improvement, moisture and fertility preservation, temperature increasing, efficient environmental protection and wide application prospects and the like.

The invention relates to a passivator for remediation of farmland soil subjected to combined pollution of heavy metals such as cadmium, chromium, copper and nickel, and a preparation method and a use method of the passivator. The passivator is prepared from a passivator A and a passivator B, wherein the passivator A is prepared from montmorillonite, kieselguhr, sepiolite, illite and ferrous sulfate; the passivator B is prepared from periclase, calcite, calcium magnesium phosphate fertilizer, plant ash and calcium hydroxide; the passivator is suitable for the farmland soil subjected to the combined pollution of the cadmium, the chromium, the copper and the nickel, and is prepared from the multiple different porous absorption materials with specific contents and a passivation material; the components of the passivator have complementary advantages, and the principles such as absorption and stabilization are combined; the combination forms of the heavy metals are effectively enhanced by ion exchange, complexing, chelating and adsorption methods, and the combination forms are converted into more stable strong organic binding states and residue states, so that the effective state contents of the heavy metals in the farmland soil are effectively reduced, and the passivation effect is long-acting and stable; therefore, the passivator has a great repair effect for the farmland soil subjected to combined pollution of the cadmium, the chromium, the copper and the nickel.

The invention discloses a formula for producing a special blending fertilizer for paddy rice by combining a calcium magnesium phosphate powder with a fertilizer source of urea. The invention is characterized in that: the calcium magnesium phosphate powder is combined with fertilizer sources of granular superphosphate and urea to form a layer of calcium magnesium phosphate film on the granular surface; the special blending fertilizer not only prevents the deliquescing phenomenon caused by direct contact of superphosphate with urea, but also can reduce phosphorus fixation and utilization of slow release nitrogen when applied into soil; furthermore, the calcium magnesium phosphate fertilizer contains medium trace elements essential to crop growth, and is truly a multi-element compound fertilizer. 0.9-1.1 parts of high quality calcium magnesium phosphate powder, 4.1-4.3 parts of combination urea, 0.4-0.6 part of monoammonium phosphate, 1.2-1.4 parts of granular superphosphate and 2.9-3.1 parts of potassium chloride are subjected to dry mixing and blending and packaging by bags; and the blending fertilizer contains 44% of total nutrients of nitrogen, phosphorus and potassium, wherein the three are in the ratio of 20:6:18.

The invention discloses a passivator for repairing a compound heavy metal polluted farmland. The passivator comprises the following components in parts by weight: 15-25 parts of rock-type mineral particles, 8-15 parts of nano-iron, 5-15 parts of a calcium magnesium phosphate fertilizer, 25-40 parts of coal ash, 15-25 parts of biochar and 10-15 parts of red mud. The passivator for repairing the compound heavy metal polluted farmland disclosed by the invention can effectively reduce the plant effectiveness of heavy metals lead, arsenic, cadmium and chromium in soil, and meanwhile, the soil nutrients are improved and the physical and chemical properties of the soil are maintained.

The invention discloses a peanut special microbial fertilizer and relates to the technical field of crop special fertilizers. Raw materials of 5-20 parts of compound microbial additives, 5-25 parts of turfy soil, 20-50 parts of urea, 5-25 parts of calcium magnesium phosphate fertilizers, 5-30 parts of monoammonium phosphate, 10-35 parts of potassium sulphate and 1-10 parts of bentonite are utilized, and the raw materials are subjected to stirring mixing by a mixer, granulation, drying and screening to obtain the peanut special microbial fertilizer. The peanut special microbial fertilizer has the advantages that the soil environment can be improved, the soil hardening can be eliminated, effects of inhibiting germs and resisting diseases can be achieved, the nutritions are comprehensive, and peanut yield and quality can be improved.

The invention relates to an acid soil conditioner. The acid soil conditioner is prepared from, by weight, 20-40 parts of quick lime, 25-45 parts of straw charcoal powder, 5-15 parts of attapulgite, 5-15 parts of calcium magnesium phosphate fertilizer, 5-15 parts of silicon fertilizer, 5-15 parts of pig manure organic fertilizer, 5-15 parts of turf and 1-10 parts of K2HOP4. The invention further relates to a preparation method and application of the acid soil conditioner. The low-cost raw materials are combined according to a specific ratio, a use method is easy and convenient, the soil pH can be adjusted, nutritional elements needed by plants are added while the pH adjusting and heavy metal adsorption capacity is guaranteed, soil organic matter can be increased, formation of the soil granular structure can be promoted, the permeability of soil can be enhanced, plant growth can be promoted, and the risk of soil caking caused by application of a soil conditioner can be reduced.

The invention discloses a high-activity seaweed fertilizer specially used for peanuts and a preparation method thereof and belongs to the technical field of production of crop specially-used fertilizers. The high-activity seaweed fertilizer is prepared from following raw materials comprising: urea, monoammonium phosphate, a calcium magnesium phosphate fertilizer, potassium sulfate, borax, EDTA chelating iron, EDTA chelating manganese, EDTA chelating zinc, ammonium heptamolybdate, a seaweed extraction liquid and seaweed residues. Compared with a fertilizer in the prior art, the high-activity seaweed fertilizer specially used for the peanuts is reasonable in formula, is complete in nutrition, can achieve an effect of increasing yield of the peanuts and improving quality of the peanuts.

The invention discloses a composite passivator for restoring heavy metal cadmium contaminated soil, which comprises the following components in percentage by weight: 25.0-75.0% of a calcium magnesium phosphate fertilizer and 25.0-75.0% of turf. The composite passivator for restoring heavy metal cadmium contaminated soil disclosed by the invention can significantly reduce the effective state cadmium content of soil and the cadmium content of vegetables, and also can increase the pH value of soil; the composite passivator is used for controlling wide heavy metal cadmium contaminated vegetable soil; and by using the passivator, the heavy metal cadmium content of vegetable products is lower than a national food safety standard value, therefore, the passivator is of great significance to the guarantee of food safety, and has a board application prospect.

The invention relates to the production of a compound fertilizer, in particular to the production of a microorganism organic-inorganic compound fertilizer, belonging to the organic fertilizer production field. The invention consists of pretreated chicken manure, maize straw power, dry coal slurry, microorganism zymogen inoculum, carbamide, lemery, fused calcium magnesium phosphorus potash fertilizer, humic acid and attapulgite soil. The invention has the advantage of having available for raising the content of organic matter in fertilizer through adding proper amount of coal slurry into the materials of the microorganism organic-inorganic compound fertilizer, which can be proved by actual production. Replacing such phosphate fertilizer as superphosphate with fused calcium magnesium phosphorus potash fertilizer in the materials of the microorganism organic-inorganic compound fertilizer does not influence the effect of phosphate fertilizer, can raise fertility and promote crops to grow owing to the added trace elements necessary for crop growth.

The invention discloses a special organic / inorganic compound fertilizer for sugarcane produced by use of the filter mud from a sugar factory. The special organic / inorganic compound fertilizer is prepared from the following raw materials in percentage by weight: 4.17-42.87% of urea, 11.52-60.87% of calcium superphosphate or calcium magnesium phosphate, 3.33-16.66% of potassium chloride and 25.0-37.5% of dry filter mud. The special organic / inorganic compound fertilizer is prepared by the following steps of: (1) stacking the filter mud for natural fermentation; rotting the stacked filter mud for ripening from top to bottom; spreading the rotten filter mud; drying in the sunlight until the water content is 15-25%, and grinding the filter mud by a grinder; adding nitrogen, phosphorus and potash fertilizer into the filter mud after fermentation and grinding according to the proportion of the raw materials; mixing and then grinding, granulating, drying, cooling and screening; and packaging to obtain a finished product. The special organic / inorganic compound fertilizer disclosed by the invention has the advantages of long fertilizer efficiency, soil improvement, soil fertility improvement, avoidance of soil hardening and the like, can effectively improve the yield per unit by 0.5-1.0 ton of sugarcane and the sugar content of the sugarcane by 0.5-1.0%, and also can improve the utilization rate of the chemical fertilizer by 3-5%.

The invention belongs to the technical field of soil improvement and repairing, and particularly relates to an acid soil improver, and also relates to a continuous steam-pressure device and method of the improver. The acid soil improver comprises the following components in part by weight: 42 to 50 parts of potassium feldspar, 6 to 15 parts of sodium silicate, 10 to 20 parts of calcium magnesium phosphorus fertilizer, 18 to 28 parts of lime, 20 to 30 parts of plant ash / coal ash, 15 to 25 parts of humic acid, 3 to 10 parts of magnesium oxide, 1 to 7 parts of activated auxiliary material and 0. 5 to 2 parts of trace elements. The acid soil improver can neutralize and immobilize acidity generating ions such as H+, Al<3+>, Fe<3+> and the like in surface soil and can improve the soil structure; moreover, by adopting the composite microbial agent, not only can the acidified soil be effectively improved and the micro-ecological environment of the soil be improved, but also disease microorganisms of the soil can be eliminated. The acid soil improver can be produced in a large scale, and the three-waste (waste water, waste solid and waste gas) problem can be avoided. The acid soil improver is suitable for being widely popularized to use, and vast economic benefit can be produced.

The invention relates to a straw biology organic fertilizer and the manufacture method that could effectively solves the fully use of straw, fertilizing, and good harvest problem. The method is mixing straw powder, dejection, shale powder, fused calcium magnesium phosphate, mixed cake, bran powder, urea, and other assistant material and compounding enzyme nutrient solution. The method is that adding dejection, shale powder, fused calcium magnesium phosphate, mixed cake, bran powder, urea, and assistant material to the smashed straw, mixing with enzyme nutrient solution taking fermenting, deodorizing, detoxicating, graining, drying, filtering, and packaging. The invention has good effect, easy method, plenty resource, wide application, and has great prospect.

The present invention relates to a soil repairing agent and a preparation method thereof, and belongs to the field of agriculture. The technical problem solved by the present invention is to provide a soil repairing agent and a preparation method thereof. The soil repairing agent of the present invention comprises, by weight, 5-20 parts of trithiocyanuric acid, 10-30 parts of a phosphate, 15-30 parts of a carbonate, 45-60 parts of sepiolite, and 2-5 parts of an adhesive, wherein the phosphate is preferably a calcium-magnesium-phosphorus fertilizer and / or phosphorus ore powder, the carbonate is preferably calcium carbonate and / or magnesium carbonate, and the adhesive is preferably carboxymethyl starch, dextrin or diatomite. Further the invention discloses the preparation method of the repairing agent. According to the present invention, the soil repairing agent provides good repairing effects on the heavy metal cadmium-polluted soil, particularly the contents of heavy metals such as lead, cadmium and the like in the soil can be substantially reduced, various components are harmless to human body and environments, and the soil repairing agent has the characteristic of green environmental protection.

The invention belongs to the technical field of ore dressing chemical industry, particularly a method for preparing a phosphate fertilizer soil conditioner by utilizing phosphate tailings and acid wastewater. The method comprises the following steps of: using ore pulp of the phosphate tailings as the raw material, adding the acid wastewater drained from enterprises such as sulfuric acid plants, phosphate fertilizer plants, metallurgical plants and the like, and mixing the acid wastewater and the phosphate tailings in a tailing buffer pool; conveying mixed slurry to a tailing pond from the tailing buffer pool; by stockpiling for 6 months to 12 months, performing reaction on phosphorite in the phosphate tailings and sulfuric acid in the acid wastewater so as to obtain the soil conditioner with effects of a calcium-magnesia phosphate fertilizer, i.e. tailings with water content of less than 10 percent in dry basis in the tailing pond. The method is simple to operate, enables the waste tailings to be changed into the soil conditioner with utilization value without investing equipment or using drug and simultaneously treats the acid wastewater which pollutes the environment, and has important significance for comprehensive utilization of resources and environment protection.

The invention relates to a remediation agent for heavy metal cadmium contaminated soil. The remediation agent is prepared from the following raw materials in parts by weight, 100-400 parts of limestone, 100-400 parts of biochar, 10-30 parts of calcium magnesium phosphate fertilizer and 50-200 parts of clay. The sources of the raw materials of the remediation agent are natural, no secondary pollution is caused to soil, the cost is low, and the remediation effect is obvious; the bioavailability of cadmium in a remedied cultivated land is obviously reduced, the environmental quality is obviouslyimproved, and the remediation period is short; the remediation agent has the effect of long-term sustained release, and has the good effect all the time through observation for up to ten years; and apreparation method of the remediation agent is simple, when the remediation agent is applied, applying time is in a normal cultivated land turning-over stage, no extra turning-over step is added, damage to a soil structure is reduced, and the remediation agent has a good application prospect in the aspect of remediation for the large-scale heavy metal cadmium contaminated cultivated land.

The invention discloses an inorganic-organic composite soil conditioner. The inorganic-organic composite soil conditioner comprises medical stone, sepiolite, a calcium source, iron powder, biologicalcarbon, humate and a calcium-magnesium-phosphorus compound fertilizer, wherein the calcium source is oxide or hydroxide of calcium; the iron powder has a particle size of 10 to 40 [mu]m; the particlesizes of the medical stone, the sepiolite and the calcium source are 150 to 400 meshes; and the particle sizes of the biological carbon, the calcium-magnesium-phosphorus compound fertilizer and the humate are 1 to 2 mm. The invention also provides a preparation method and an application for the soil conditioner. Through a great amount of studies, the inventor of the invention finds that the inorganic-organic composite soil conditioner with particle morphology can be prepared without the need of an auxiliary granulating additive by compounding components with particle size ranges. The inorganic-organic composite soil conditioner provided by the invention has simple preparation method, is convenient to apply, can repair and treat heavy metal contaminated soil, guarantees the safety of grain,can improve the structure of soil, improves the quality of the grain, and facilitates application and acceptance.

The invention discloses an acidic soil conditioner and an application thereof. The acidic soil conditioner comprises, by mass, 33-36% of rice husk ash, 14-16% of quicklime, 24-26% of calcium magnesiumphosphate, 22-24% of sepiolite and 1.5-2% of dicyandiamide. The conditioner includes the rice husk ash, quicklime, calcium magnesium phosphate, sepiolite and dicyandiamide, and the rice husk ash, quicklime and calcium magnesium phosphate fertilizer are alkaline substances and can increase the pH value of the soil. The rice husk ash and calcium magnesium phosphate commonly act to supplement nutrients lost due to soil acidification. The sepiolite and dicyandiamide commonly act to improve the nitrogen fertilizer utilization rate. The rice husk ash and sepiolite commonly act to improve and repairacidic heavy metal contaminated soil. The rice husk ash, calcium magnesium phosphate and sepiolite commonly act to inhibit the enrichment of cadmium and other heavy metals in crops. The acidic soil conditioner can comprehensively improve the properties of the soil, improve the fertility level of the soil, reduce the cadmium contamination risk of the crops and increase the yield of the crops.

The invention discloses special cotton fertilizer for regulating and controlling coastal saline-alkali land soil and belongs to the technical field of special fertilizers for crops. The special cotton fertilizer is prepared from the following raw materials in parts by weight: 300-450 parts of urea, 1-100 parts of diammonium phosphate, 50-120 parts of potassium dihydrogen phosphate, 100-200 parts of potassium sulfate, 50-150 parts of calcium humate, 1-50 parts of calcium-magnesium phosphate, 1-50 parts of magnesium sulfate, 1-10 parts of zinc sulfate and 1-10 parts of high-strength water retention agent. Compared with the prior art, the special cotton fertilizer has the advantages that due to the addition of water-soluble calcium humate, the special cotton fertilizer can be used for inhibiting salt and holding moisture; due to the addition of a proper volume of water retention agent, the special cotton fertilizer can be used for regulating and controlling water retention, increasing the fertilizer effect and increasing fertilizer utilization ratio; due to the addition of essential secondary / trace elements, the resilience resistance is enhanced, and the product yield and quality are improved.

The invention discloses a novel seaweed biological bacterial fertilizer, which belongs to the technical field of microbial fertilizer production. The novel seaweed biological bacterial fertilizer comprises the following raw materials in parts by weight: 5-50 parts of seaweed meal, 5-20 parts of compound sodium nitrophenolate, 150-450 parts of urea, 200-500 parts of triple superphosphate, 100-350 parts of potassium sulphate, 20-200 parts of calcium magnesium phosphate, 0-20 parts of EDTA (ethylene diamine tetraacetic acid) chelation trace elements, and 10-40 parts of microbial agents. Compared with the prior art, the fertilizer disclosed by the invention is comprehensive and balanced in nutrients, natural green and pollution-free; and the fertilizer can increase the stress resistance of crops, enhance the utilization rate of the fertilizer, improve the soil, enrich the soil fertility, and enhance the quality of crops.

The invention discloses a rice fertilizer. The rice fertilizer comprises, by weight, 10-15 parts of urea, 5-10 parts of diammonium hydrogen phosphate, 5-8 parts of potassium chloride, 5-9 parts of potassium sulfate, 3-8 parts of nitrohumic acid, 5-8 parts of ammonium chloride, 3-5 parts of calcium magnesium phosphate, 5-8 parts of glycerin and 5-9 parts of an additive. The rice fertile can protect rice from rice blast, false smut and the like, and has a low cost.

The invention discloses a red-soil-region peanut continuous-cropping obstacle reducing special fertilizer, a preparation method and a usage method. The special fertilizer is composed of, in percent by weight, 10-30% of decomposed dry bird excrement, 10-30% of humic acid, 10-20% of urea, 20-40% of calcium-magnesium-phosphorus fertilizer, 10-15% of potassium chloride, 0.5-2% of borax, 0.5-2% of zinc sulfate, 0.01-0.05% of ammonium molybdate, 0.005-0.02% of compound sodium nitrophenolate, 0.001-0.01% of sodium alpha-naphthyl acetate, 0.01-0.05% of hymexazol, and 0.01-0.05% of diazinon. The special fertilizer is applied red-soil-region field on which peanut is continuously cropped for three or more years with the usage amount of 2000-2500 Kg / hm<2>, the usage method comprises that the fertilizer is completely basally applied for one time, or the fertilizer is applied for two times according to the base-fertilizer topdressing-fertilizer weight ratio of 2:1, the base fertilizer is applied in furrows before peanut is sowed or is spread over the whole field when ploughing is performed, topdressing is combined with intertillage weeding, and fertilization and earthing up are performed. The special fertilizer is verified to be capable of increasing peanut output by 15-25% compared with a conventional fertilizer by applying the special fertilizer to a large field on which peanut is continuously cropped for 10 years or more at 2012 and 2013, and the application method is simple, reasonable, and high in operability, and exhibits technical progress.

The invention discloses a soilless culture method of drought-resistant flowers in an open-air roof. The method comprises the following steps of: manufacturing ridges with height of 12-20cm at intervals in the open-air roof by sawdust cement paste; filling a soilless culture matrix composed of 30-50% of residue after mushroom plantation, 30-50% of sawdust, 5-10% of perlite, 3-5% of plant ash and 3-5% of calcium-magnesium-phosphate fertilizer to the ridges; cultivating drought-resistant flower seedlings in the soilless culture matrix; spraying water and killing insects in a wet condition; using 0.1-0.3% of urea and 0.3-0.6% of composite fertilizer water solution to pour the seedlings during the growth period. Plants with strong drought resistance, such as portulaca grandiflora, maguey, ball cactus, cactus, calendula officinalis and sago cycas, are applied to form a roof garden, which remains green, has flowers throughout the year, is colorful and has various shapes, thus saving labor, preventing heatstroke and protecting the roof surface as well as improving ornamental value, economic value, and greening economic, ecological and social effects.

The invention provides a granular southern paddy field acid soil conditioner using rice husk as a matrix, wherein the raw materials comprise 25-38% of carbonized rice hull, 10-20% of rice hull silicon-alkali, 14-25% of fly ash, 28-40% of silicon-calcium-magnesium-phosphorus-potassium fertilizer, and 2-8% of polyacrylamide. According to the present invention, the conditioner can obviously reduce the bulk density of the soil, can increase the soil porosity and the proportion of large aggregates, can effectively prevent soil from hardening, and can provide a large amount of Ca<2+>, Mg<2+>, K<+> and other salt-based ions so as to perform equal exchange with H<+>, Al<3+> and other acid forming ions adsorbed by soil colloids, wherein the exchanged H<+> and the Al<3+> are neutralized and precipitated with the OH<-> carried by the conditioner and the OH<-> released by the active silicon hydrolysis, such that the problems of acidity and toxicity of paddy field acid soil are fundamentally solved.

The utility model discloses a method for applying a basic fertilizer to furrow surfaces for castanopsis fissa container seedling cultivation. The method is characterized in that the basic fertilizer of cultivating seedlings is applied to furrow surfaces of cultivating seedlings, a container of cultivating seedlings is placed on furrow surfaces of cultivating seedlings, furrow heights of cultivating seedlings are in a range between 5 cm and 15 cm, the furrow surface width is 100 cm, lengths are in a range between 10 m and 15 m, the footpath width is in a range between 0.3 m and 0.4 m, the basic fertilizer is more than one of a calcium magnesium phosphorus fertilizer, charring sawdust and fermented paulownia bran, and the individual usage amount is 90-100g / m2 of the calcium magnesium phosphorus fertilizer, 700-900g / m2 of the fermented paulownia bran and 500-700 / m2 of the charring sawdust. Seedlings with heights ranging between 4cm and 6cm which are cultivated in a traditional method aretransplanted to container cups which are neatly placed on furrow surfaces of cultivating seedlings and have matrixes, and the basic fertilizer is applied to furrow surfaces of cultivating seedlings. The method is simple, easy to operate, uniform in fertilization, time-saving, labor-saving and high in working efficiency, prevents root systems of seedlings from directly contacting fertilizers and reduces fertilizer damage. Simultaneously, the fertilizer effect is not reduced, the fertilizer is released slowly, the cost of cultivating seedlings is low and economic and social benefits are good.

A soil improver reducing the lead content of tea leaves and a method are provided, which is characterized in that the improver consists of a product A and a product B; wherein, the product A is calcium carbonate and / or dolomite fines and the product B is the mixture of the product A, phosphate rock powder and / or calcium-magnesia phosphate fertilizer; the weight ratio of the product A, phosphate rock powder and / or calcium-magnesia phosphate fertilizer in the product B is 2 to 4 : 1. The above soil improver reducing the lead content of tea leaves and the method provide that reducing the lead content of tea leaves is the main purpose, reasonably use the calcium carbonate, dolomite fines, phosphate rock powder and calcium-magnesia phosphate fertilizer, which not only reduces the absorption of the tea plant to the heavy metals, improves the hygienic quality standards of tea leaves but also does not affect the normal growth and development of tea plant and has the function of improving the soil and can effectively reduce the bioavailability of the lead in the tea garden soil.

The invention relates to a preparation method of a modified acid soil conditioner. Firstly, compound biochar is prepared through organic manure and straw, then no-full ammonia activation is conductedto modify the raw material, and furthermore, calcium-magnesia phosphate and optimized microbial preparation are mixed to obtain the conditioner. By adopting combination of the specific kinds and specific dosages of the soybean straw and the rape straw, the cost is low, the utilization rate is high, and the effect is good; the manure, humic acid and the straw are matched with one another to preparethe organic compound biohar, and the obtained compound biochar is more efficient. By means of the soil conditioner, the capacity of neutralizing the pH value in the soil is improved, the conditionercan improve the pH value by 1-2, the soil organic matter content is improved, exchangeable aluminium is reduced, cadmium is reduced, and the soil permeability and the water retaining capacity are improved, so that granular structure forming and stabilization are facilitated.

The present invention discloses a spinach composite fertilizer, wherein the raw materials comprise, by weight, 20-30 parts of ammonium nitrate, 15-20 parts of a calcium magnesium phosphorus fertilizer, 15-22 parts of potassium chloride, 30-40 parts of plant ash, 15-20 parts of young grass, 20-30 parts of animal manure, 15-20 parts of animal hair, 1-2 parts of white sugar, 1-3 parts of brown sugar, 1-3 parts of an enzyme microorganism composting accelerator, 5-6 parts of attapulgite, 8-13 parts of lignite, 5-10 parts of phosphorite powder, 15-20 parts of bentonite, 10-13 parts of kaolin, 0.5-2 parts of enzyme microorganism, 10-13 parts of humus, 15-18 parts of calcium superphosphate, 6-8 parts of magnesium sulfate, 2-4 parts of zinc sulfate, 3-5 parts of copper sulfate, and 2-4 parts of sodium molybdate. The spinach composite fertilizer of the present invention meets the absorption law of the spinach on nutrients and has the high fertilizer utilization rate.

The invention discloses a passivator for repairing cadmium and arsenic polluted farmlands, a preparation method and a repair method, and the passivator comprises the following components in percentageby mass: 20-30% of charcoal, 10-20% of active bacteria; 10% -20% of reduced iron powder, 10% -20% of calcium magnesium phosphate fertilizer and 20% -30% of bentonite. The invention aims to provide the passivator which is low in cost, environment-friendly and free of secondary pollution.

The invention provides a special Tripterygium wilfordii composite fertilizer for peanuts and its preparation and application, belonging to the field of cultivation technology of peanuts. In the prior art, the methods of mixing of peanut seeds with reagents and spreading of toxic soil are used for controlling underground insects for peanuts; since drug effects last for a short time, the effect of controlling is not ideal. The fertilizer provided in the invention comprises, by weight, 4 parts of Tripterygium wilfordii powder with a fineness of 200 meshes, 20.9 parts of peanut hull powder with a fineness of 100 meshes, 15 parts of urea, 24 parts of potassium sulfate, 5 parts of diammonium phosphate, 30 parts of a calcium-magnesium-phosphorus fertilizer, 1 part of boric acid and 0.1 part of ammonium molybdate. The above-mentioned raw materials are uniformly mixed and granulated. During soil tillage before peanuts sowing, every 50 kilograms of the fertilizer is uniformly spread onto a field having an area of 667 m<2> and ploughed into soil. The advantages of the invention are as follows: a lasting drug effect and a good effect of killing underground insects for peanuts are achieved; peanut growth is promoted, and output of peanuts is increased; there is no pesticide residue in the soil; a preparation process is simple; application of the fertilizer is convenient, labor and time for individual application of pesticides are left out, and therefore, application of the fertilizer is labor- and time-saving.