30results about How to "Reduce risk of leaching" patented technology

The invention discloses a heavy metal-contaminated soil solidifying agent and an application method thereof. The solidifying agent comprises the following components by mass: on the basis of the dry weight of heavy metal-contaminated soil, 10 to 15% of a binding material, 5% of biochar, 10% of vegetable fiber and 1% of a stabilizing agent. The components are added according a sequence of the stabilizing agent-the biochar-the vegetable fiber-the binding material. Addition of the chemical stabilizing agent and the biochar in the process of stabilization enables heavy metals to be absorbed and passivated and to lose mobility; preparation of heavy metal-contaminated soil slurry provides conditions for a later chemical reaction; the whole processing process is free of dust pollution and discharging of unwanted sewage. Addition of the vegetable fiber enables cracking of heavy metal-contaminated soil solidified by using a conventional solidifying agent to be effectively prevented and endurance of a solidified body to be improved. The method provided by the invention has the advantages of strong operability, low cost, extensive applicability, a high resource utilization rate, low environmental risk and easy large-scale popularization.

The invention discloses a water tending and rain avoiding fertilizing method for reducing chemical fertilizer non-point source pollution of a plain rural section in the south, and relates to two soil utilization types, namely, dry land and paddy fields. The method comprises the steps that in the dry land, 1, the dry land serves as farmland, the proper fertilization period of soil is determined, and fertilization is carried out according to the proper fertilization period of the soil; 2, fertilization and rain avoiding are carried out according to weather forecast; 3, deep application of fertilizer and earthing are carried out; in the paddy fields, 1, the paddy fields serve as farmland, and water storage and field preparation are carried out; 2, ridges are heightened; 3, fertilizer is applied to shallow water; 4, fertilization and rain avoiding are carried out according to weather forecast; 5, drainage is avoided. By means of the water tending and rain avoiding fertilizing technology, dissolution of fertilizer nutrients in the soil is accelerated, absorption of the nutrients by crops is promoted, the yield is increased, the risk of leaching loss of the fertilizer nutrients caused by direct surface runoff and subrosion is reduced, farmland non-point source pollution is effectively avoided or relieved, and good economic, social and environmental benefits are achieved.

The invention discloses a gypsum coated slow-release fertilizer and a preparation method and application thereof. The fertilizer consists of an inner core and a coating layer. The inner core componentis prepared from the following components in parts by mass: 35 to 55 parts of urea, 0.2 to 0.5 part of urease inhibitor NBPT, 1 to 3 parts of nitrification inhibitor DMPP, 0.3 to 0.5 part of nitrification inhibitor CP, 0.1 to 0.2 part of stigmasterol, 0.5 to 1 part of polyglutamic acid, 5 to 10 parts of monosilicic acid, 15 to 30 parts of fulvic acid and 1.5 to 3 parts of chitosan; and the coating layer comprises the following components in parts by weight: 15-25 parts of gypsum and 4-6 parts of an adhesive. The slow-release fertilizer has the comprehensive effects of reducing salt, improvingalkali, controlling nutrient leaching loss, keeping soil storage, increasing soil retention, promoting crop absorption and the like; gypsum is used for reducing salt and improving alkali, the ureaseinhibitor, the nitrification inhibitor and the like are combined to reduce nitrogen loss, fulvic acid, polyglutamic acid, chitosan and the like are combined to improve the resistance and nutrient absorption capacity of crops, and a virtuous cycle system for reducing nitrogen nutrient loss, preserving storage and improving efficiency of the saline-alkali soil is formed.

The invention discloses a core-shell structure ceramsite coating layer additive and an application thereof, which belong to the technical field of contaminated soil governing, the ceramsite coating layer additive comprises the following raw materials by mass: 20-90% of a fluxing agent; and 10%-80% of a passivating agent. The additive provided by the invention can further enhance the solid sealingeffect of the coating layer on heavy metals, reduce the porosity of a coating layer, increase the compactness of the coating layer, reduce the leaching risk of the heavy metals and realize harmless treatment.

The invention discloses a triammonium citrate modified trace cobalt-doped magnesium-aluminum ternary hydrotalcite-like composite catalyst and a preparation method and application thereof.The preparation method of the catalyst comprises the steps that cobalt salt, magnesium salt, aluminum salt, an alkali source and triammonium citrate are mixed to prepare a catalyst precursor solution, and the catalyst precursor solution is subjected to a hydrothermal reaction to obtain the trace cobalt-doped magnesium-aluminum ternary hydrotalcite-like composite catalyst. The triammonium citrate modified trace cobalt doped magnesium-aluminum ternary hydrotalcite composite catalyst is obtained. According to the preparation method disclosed by the invention, the triammonium citrate is used as a reducing agent to regulate and control the hydrothermal synthesis process, so that the prepared triammonium citrate modified trace cobalt-doped magnesium-aluminum ternary hydrotalcite-like composite catalyst has the advantages of low leaching risk, high catalytic activity, good recycling property and the like, and is a novel hydrotalcite catalyst with excellent performance; the method can be widely used for degrading organic pollutants (such as antibiotics) in a water body, and is high in use value and good in application prospect. The preparation method provided by the invention has the advantages of simple preparation conditions, high yield, low cost, strong operability and the like, and is easy for batch production.

A system for irrigating and draining coastal landscape without power includes a water intake and drainage well located on the shore and extending along the slope into the river, a percolation device is arranged at a position lower than the water surface at the bottom of the water intake and drainage well, a longitudinal water delivery pipe is arranged in that water taking and draining well, the bottom end of the water delivery pipe is connected with the water outlet of the infiltration device, a plurality of irrigation and drainage pipes are horizontally arranged at the position of the crop root on the shore, the irrigation and drainage pipes are communicated with the water delivery pipe, and a plurality of water-permeable and air-impermeable micro-pore irrigation and drainage devices arearranged on the irrigation and drainage pipes at intervals. The device has both irrigation function and drainage function, without additional power, and can automatically make up water and drain waterfor crops at different heights of bank slope, so that the soil root layer around the emitter is kept in a constant water range, energy is saved, pollution is reduced, water resource utilization efficiency is improved, and the leaching risk of soil particles and nutrients is reduced.

The invention provides a fertilizer additive for reducing nitrate in outdoor vegetables and leaching loss of soil nitrate nitrogen. The fertilizer additive comprises 3, 4-dimethylpyrazole phosphate and chitin; a fertilizer is an inorganic fertilizer or a mixture of the inorganic fertilizer and an organic fertilizer; the addition amount of the 3, 4-dimethylpyrazole phosphate is 1% of N in the inorganic fertilizer; the addition amount of the chitin is 0.30%-0.62% of N in the inorganic fertilizer; chitosan is taken as the basis. According to the fertilizer additive, the content of the nitrate inthe outdoor vegetables and the leaching loss of the soil nitrate nitrogen can be effectively reduced, the quality of the vegetables is improved, and the environment stress is relieved.

The invention discloses a spring corn fertilization method. The method is as follows: 1) determine the target yield in the target area, and calculate the nitrogen agronomic efficiency of spring corn crops in the target area; estimate the nitrogen fertilizer use amount in the target area according to the nitrogen agronomic efficiency; 2) determine the target according to the nitrogen fertilizer use amount in the target area The amount of organic fertilizer and chemical fertilizer in the area is allocated; 3) According to the allocation result of step 2), determine the type of nitrogen fertilizer and the proportion allocation of base topdressing fertilizer. On the basis of considering soil and meteorological conditions, the present invention takes into account the agronomic effect, yield benefit and environmental benefit, combines the QUEFTS model to simulate crop nutrient absorption parameters, estimates different potential yields, and is equipped with microbial fertilizer/organic fertilizer application and reasonable automatic irrigation This technology not only ensures high yields of spring corn, but also reduces the risk of nutrient leaching, reduces greenhouse gas emissions, improves soil quality, and increases microbial activity.

The invention provides a micro spraying, fertilizing and culturing method of crops. The micro spraying, fertilizing and culturing method of crops comprises the steps of collecting soil nutrient data and meteorological parameters of a target area, and arranging a monitoring sensor in the target area; determining the objective yield of crops and the content of readily available nutrients of soil inthe target area according to the yield in former years; inputting the soil nutrient data and the meteorological parameters collected in S1 and S2 in an SWAT model, performing simulated calculation, and calculating the agronomic N use efficiency of crop planting; and calculating the consumption of a nitrogenous fertilizer in the target area through combination of the agronomic N use efficiency withdata monitored by the monitoring sensor. Through spraying with micro-spraying hoses, a crop model is applied, soil and meteorological conditions are considered, fertilizing is scientific and reasonable, the objective yield is determined, the fertilizing condition is determined according to the meteorological conditions, the optimal topdressing period of a base fertilizer is determined, and through cooperation of slow release of a fertilizer by the micro-spraying hoses, nutrient release is performed according to nutrient absorption by crops.