289results about How to "Reduce cadmium content" patented technology

The present invention relates to a method for controlling heavy metal cadmium content in the rice, belonging to the field of paddy rice planting technology. It is characterized by that in the course of land preparation before rice field seedling transplantation the ferrochelate can be applied into the soil, and said ferrochelate and the soil are uniformly mixed; and in the spike formation stage and filling stage of rice the ferrochelate also can be respectively applied in the rice field. Said method can make cadmium content in the rice be less than 0.2mg/kg.

The invention discloses an application of melatonin in reducing cadmium accumulation in plants. The application includes the following steps: (1) mixing melatonin and additives to form aqueous solution; (2) spraying the aqueous solution on plant leaf surfaces under cadmium stress or filling the aqueous solution in nutrient solution or soil where plants grow. The melatonin can quickly and efficiently reduce cadmium content in plant leaves, change distribution of cadmium ions in plant cells, and relieve damage of cadmium to cells; in addition, the melatonin is simple to prepare and convenient to use, does not cause product and environment pollution, does not generate phytotoxicity easily and has a wide application prospect.

The invention relates to a crop rotation matching and fertilizing method capable of controlling accumulation of rice heavy metal cadmium and belongs to the technical field of rice planting. The crop rotation matching and fertilizing method provided by the invention comprises the steps of 1) selecting cruciferae or leguminous crop with high sulphur content as a previous crop; 2) applying sulphur base fertilizer with sulphur ratio of 0.25-5.0kg/666.7m<2> when the previous crop is planted, or spraying 0.05-1.0% of sulphate for at least 1-3 times in a reproductive stage; 3) taking the previous crop as green manure, smashing or directly turning the previous crop into soil to be mixed with the soil 5-15 days before rice transplantation, and carrying out waterflooding on the transplanted rice seedling; and 4) repeating the steps 1)-3) year over year. The previous crop matching mode adopted in the invention roots in the traditional peasant production mode, sulphur fertilizer is also taken as the traditional farming measure, an operation process is simple, price is low, usage cost is low, the crop rotation matching and fertilizing method provided by the invention is universally applicable to heavily, medially and mildly cadmium-polluted rice field and crop production lands in China, and cadmium content in rice can be obviously reduced.

The invention relates to a mushroom cultivation substrate, which consists of solid materials and water. The mushroom cultivation substrate is characterized in that the solid materials comprise by weight 78-82% of broad-leaf tree sawdust, 14-20% of wheat bran, 0.8-1.2% of sucrose, 0.7-1.2% of gypsum powder, 0.8-1.5% of fused calcium-magnesium phosphate fertilizer, and 0.8-1.5% of a compound fertilizer, and that water in the mushroom cultivation substrate accounts for 58-62% of the total weight of the solid materials. According to the mushroom cultivation substrate, fused calcium-magnesium phosphate fertilizer and the compound fertilizer serving as mushroom heavy metal modifying agents are added in the conventional cultivation substrate of the mushroom, the addition amount of fused calcium-magnesium phosphate fertilizer and the compound fertilizer is within the range of 0.8-1.5%, so that the cadmium content in the mushroom is reduced by 18-39.6%, and the mercury content is reduced by 19.9-29%; moreover, the accumulation function of the heavy metals can be reduced to the largest degree, and the adverse effects on important agronomic characteristics such as mycelium spreading speed, yields and the like are avoided.

The invention discloses an immobilized Bacillus having phosphate dissolving and heavy metal passivation functions and a preparation method and an application thereof, which belong to the technical field of cadmium pollution soil biological restoration. The immobilized Bacillus comprises biological carbon and Bacillus cereus B19, can be used for restoring the soil with severe cadmium pollution, and has better restoration effect. The composite microbe fertilizer contains the immobilized Bacillus, an organic fertilizer and an inorganic nutrient having the phosphate dissolving and heavy metal passivation functions. The composite microbe fertilizer has the advantages that cost is low, soil available nutrient content is increased, yield increase is achieved, the soil with cadmium pollution is effectively repaired, introduction of heavy metal cadmium in human body with crops can be effectively controlled, agricultural product safety is guaranteed; in addition, the composite microbe fertilizer cannot change a farmland utilization mode without secondary pollution, is conveniently used, and is economic and feasible.

The invention discloses a fertilizer capable of controlling rice cadmium accumulation and a preparation method of the fertilizer, and belongs to the technical field of fertilizers. The fertilizer is prepared by the following raw materials based in part by weight: 100 parts of organic matter based on 10% of moisture content, 1-50 parts of sulfur source based on sulfur, 0.1-20 parts of strong base, and water which is 20-100% of the total weight of the organic matter, the sulfur source and the strong base. Compared with the prior art, the fertilizer is economic and effective. The fertilizer can be combined with the traditional sulfur fertilizer application technology, so that peasants can accept the fertilizer, and the operation procedures are easier.

The invention discloses a contaminated soil repair method and a repair device. The repair method comprises the steps of (S1) vacuum thermal separation: performing thermal separation on soil in a vacuum environment so as to separate hazardous substances, and purifying the hazardous substances; (S2) chemical washing: chemically washing the soil on which the vacuum thermal separation is performed; (S3) reduction treatment: adding a reducing agent to the soil on which the chemical washing is performed; (S4) repair: applying a soil repair agent to the soil on which the reduction treatment is performed; (S5) stabilizing treatment: applying a heavy metal cadmium stabilizer and a microbial agent to the repaired soil; and (S6) improvement and maintenance: improving and maintaining the stabilized soil. According to the contaminated soil repair method, the contaminated soil can be thoroughly repaired once with low cost and high efficiency.

The present invention discloses a repairing chemical agent for reducing cadmium contamination of crops and a using method. The repairing chemical agent comprises the following raw materials: 5-45 parts by weight of a natural surfactant, 4-15 parts by weight of an oxidant and 10-60 parts by weight of a silicate mineral material. On one hand, the repairing chemical agent disclosed by the present invention, through irrigation and other farming activities, can be adsorbed on the surfaces of soil particles, so that a property of a solid-liquid interface is changed, the adhesion between cadmium ions in soil and the soil is weakened, the separation of heavy metal ions from the soil is promoted, the heavy metal ions generate a complex with active materials, and thus, the absorption of heavy metals by the crops is reduced. On the other hand, the repairing chemical agent reacts with unstable cadmium in the heavy metal contaminated soil, and stable insoluble cadmium salt precipitation is generated, so that the cadmium content in the planted crops is significantly reduced, and the requirements on the quality of safe agricultural products are met.

The invention discloses a paddy rice dedicated cadmium-reducing biological organic fertilizer and a preparation method thereof, and relates to the technical field of agricultural fertilizer; the paddy rice dedicated cadmium-reducing biological organic fertilizer is prepared by mixing granulation of 1-3 parts by weight of urea, 2-6 parts by weight of diammonium phosphate, 1-3 parts by weight of potassium sulfate, 0.5-1.5 parts by weight of a trace element, 30-50 parts by weight of livestock and poultry manure, 20-40 parts by weight of agricultural crop straw, 10-30 parts by weight of humic acid, and 0.5-1.5 parts by weight of biological bacteria. The paddy rice dedicated cadmium-reducing biological organic fertilizer is applied, aims at paddy rice fertilizer-requiring characteristics, has strong specificity and high fertilizer efficiency, and can effectively reduce the cadmium absorption of paddy rice; the paddy rice yield can be increased by 5-10%, and the quality of produced rice can meet requirements of green food. The paddy rice dedicated cadmium-reducing biological organic fertilizer is mainly used for paddy rice, and also can be used for soybean, corn, fruit trees, vegetables and other crops. When application, the paddy rice dedicated cadmium-reducing biological organic fertilizer is mainly used as a base fertilizer for furrow application, and also can be used as a topdressing fertilizer for broadcasting application.

The invention discloses application of monopotassium phosphate to reduce rice cadmium accumulation. The application disclosed by the invention is as follows: monopotassium phosphate is applied to soil in the event of preparing a land before transplanting rice; or/and monopotassium phosphate is sprayed to the upper parts of rice after transplanting rice till maturing. According to the invention, novel application of monopotassium phosphate is provided; monopotassium phosphate is capable of effectively controlling cadmium accumulation in rice; monopotassium phosphate is capable of respectively reducing cadmium contents in rice cadmium high-accumulation rice Yongyou 9 and rice cadmium high-accumulation rice Xiushui 09 brown rice to be above 80% and 85% maximally; the cadmium contents in brown rice are only 0.04 mg/kg and 0.02 mg/kg and are far below nationally regulated 0.2 mg/kg; a good solving way is provided for rice heavy metal pollution; furthermore, both the application number and the application amount of monopotassium phosphate are very low; the application disclosed by the invention is low in cost and convenient for operation.

The invention discloses a production method for cadmium-polluted rice land governing and rice cadmium reduction. The production method comprises the following steps: a, preparing biomass charcoal by late rice straw to return to field and prepare milk vetch green manure in winter; b, overturning and pressing milk vetch green manure along with spraying lime; c, regulating and controlling water fertilizer of early season rice; d, preparing biomass charcoal by straw in early season to return to field; e, regulating and controlling water fertilizer of late rice. The production method improves soil fertility, reduces the effectiveness of cadmium polluted soil, combines the water fertilizer regulation and management, and effectively stops and controls the cadmium transfer towards the rice planting body, in particular to rice; the production method provides a low-price and practicable environmental protection regulating technology for the green repair of soil heavy metal cadmium pollution and rice cadmium reduction on the polluted rice land, and provides technical support to the polluted rice field governing and rice cadmium reduction in the southern China.

The invention belongs to the technical field of agriculture, in particular to a cultivation method for reducing cadmium content in peanut seed kernels. By applying fertilizer mu by mu and dressing seeds with rare earth, the cultivation method reduces the cadmium content in the peanut seed kernels and guarantees peanut quality as well as the health of eaters.

The invention discloses a method for mid-season rice-wheat rotation in cadmium mild contamination soil and belongs to the technical field of contamination soil environment management. The method includes: (1), in 5-8d before crop transplanting, applying a soil cadmium passivation conditioner on the cadmium mild contamination soil, and well mixing with plough layer soil; (2), transplanting mid-season rice Yongyou 7850, waterflooding in the whole growth period, spraying a zinc reinforced cadmium blocking and controlling agent to leaves in the tillering period, the booting period and the groutingand fruiting period respectively, and draining field water in one week before harvesting mid-season rice; (3), fully moving out straw after the mid-season rice is harvested, directly sowing wheat Ningmai 13, cultivating to harvesting, and removing wheat straw completely. According to the mid-season rice-wheat rotation mode in the method, repair of the cadmium mild contamination soil is completedwhen agricultural production is completely normal, and the method is free of economic benefit loss and easy for farmers to accept; harvested straw is moved out of farmland, so that no secondary pollution is caused.

The invention provides a remediation method for heavy metal cadmium-contaminated farmland. The method comprises the steps as follows: water is added to the farmland, so that the farmland is soaked inthe water; a ferric salt solution is added to the treated heavy metal-contaminated farmland, and the farmland is ploughed, broken and then flattened; the surface of soil is covered with a fiber film;and the steps are repeated as a cycle. The distance between the soaking water surface and the surface of the farmland during still standing ranges from 0.5 cm to 1.5 cm, the farmland is ploughed and broken for 1-3 times, the concentration of the ferric salt solution is 0.5-1.5 mg/L, ferric salt is ferric chloride or ferric sulfate, the fiber film is a polypropylene fiber film containing activatedcarbon, modified diatomite and modified kaolin, the fiber film covering time ranges from 3 days to 5 days, and the circulating times ranges from 3 times to 5 times. The remediation method has the obvious treatment effect, the content of cadmium in the heavy metal-contaminated farmland can be effectively reduced, used reagents and materials such as the ferric chloride, the polypropylene fiber filmand the like are low in price and easy to obtain, the treatment cost is reduced, the treatment efficiency is high, and the farmland remediation speed is high.

The invention provides a compound mixed biological bacterial fertilizer for restoring cadmium contaminated soil; the compound mixed biological bacterial fertilizer includes NPK nutritious components and agricultural rare earth nitrate, a catalyst waste agent, a microbial agent, a humic acid mineral powder, sepiolite, plant ash, kaolin and zeolite with proper proportion; after the compound mixed biological bacterial fertilizer is applied to the cadmium contaminated soil, under the synergy of all the components, the contaminated soil is effectively restored while cadmium in the soil is effectively passivated and immobilized, the cadmium activity in the soil is decreased significantly, and the absorption of crops on cadmium is facilitated to be reduced, so as to make the cadmium content in the crops decreased significantly; the compound improver has relatively good stability and environmental friendly characteristic, does not produce secondary pollution, and is low in cost and prone to large-area promotion; when the compound mixed biological bacterial fertilizer is applied to the cadmium contaminated soil, the application amount is only 10-200 kg/hm<2>, the cadmium content in the crops can be significantly reduced, and the crops are allowed to meet national edible safety standards.

The invention belongs to the technical field of agricultural fertilizer application, and discloses a leaf surface fertilizer for reducing the cadmium content in rice and a preparing method of the leafsurface fertilizer. The leaf surface fertilizer for reducing the cadmium content in rice is composed of KH2PO4 with the concentration of 0.02-0.04 mol/L, zinc chloride with the concentration of 0.02-0.03 mol/L, manganese sulfate with the concentration of 0.1-0.2 mol/L and malic acid with the concentration of 0.2-0.3 mol/L. The preparing method includes the steps of weighing 0.0323 mol of KH2PO4,0.0266 mol of zinc chloride, 0.175 mol of manganese sulfate and 0.2669 mol of malic acid, adding 1 L of distilled water, and conducting vibrating and dissolving. According to the leaf surface fertilizer, by spraying a small-molecular acid type component (malic acid) on rice leaves, the endocrine metabolism adjusting and control approach of rice plants is adjusted and controlled, the plants are induced to secrete plant chelating elements capable of preventing heavy metal cadmium ion from being conveyed to grain, and the effect of the cadmium content in rice is reduced.

The invention discloses a method for improving copper slag level in zinc hydrometallurgy process. The method is characterized in that a process of washing copper slag with water in a traditional technology is removed and replaced by the process of pickling the copper slag twice, wherein the process of pickling the copper slag twice comprises the steps of leaching copper-cadmium slag through strong acid at high temperature, slurrying the copper slag for the first time, pickling the copper slag for the first time, slurrying the copper slag for the second time, and pickling the copper slag for the second time. The method is simple and clear in process; when in the actual production, the technological conditions, such as adding sulfuric acid and water, and controlling the temperature, the acidity and the solid-to-liquid ratio, are required; the operation is simple, and the production cost is low. With the adoption of the method, water-soluble zinc and water-soluble cadmium in the copper slag can be recovered, and meanwhile, the purpose of recovering insoluble zinc and insoluble cadmium in the copper slag can be achieved, so that the copper in the copper slag can be further enriched, and as a result, the obtained copper slag is high in level; the copper content in the copper slag can be increased from 45% to be more than 65%, the zinc content in the copper slag can be decreased from 12% to be less than 7%, and the cadmium content in the copper slag can be decreased from 8% to be less than 3.5%; the whole process basically realizes a real sense of clean production; the method is environmentally friendly, and high in economic benefit.

The invention provides a method for evidently lowering the cadmium accumulation of Raphanus sativus and promoting the growth of the Raphanus sativus. The method includes: when Raphanus sativus seedlings grow two true leaves, using melatonin with the concentration being 50-200 micromol*L<-1> to perform leaf surface spraying until leaf surfaces can drip water. The method has the advantages that cadmium content in the Raphanus sativus can be lowered evidently, the photosynthetic pigment content, antioxidant enzyme activity and biomass of the Raphanus sativus can be increased evidently, and the inhibition effect of cadmium on the growth of the Raphanus sativus can be relieved effectively.

The invention relates to a phosphate for lowering the content of cadmium in plants planted in acidic cadmium-containing soil and/or improving the yield of the plants planted in the acidic cadmium-containing soil, and mainly provides an application method and the like of the phosphate for lowering the content of cadmium in the plants planted in the acidic cadmium-containing soil and/or improving the yield of the plants planted in the acidic cadmium-containing soil.