CN103589435B - For administering native regulatory agent of farmland soil heavy metals pollution and preparation method thereof - Google Patents
For administering native regulatory agent of farmland soil heavy metals pollution and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of native regulatory agent for administering farmland soil heavy metals pollution and preparation method thereof.Native regulatory agent of the present invention is made up of tea waste and potassium humate.First the present invention gets tea waste and dries for subsequent use.Next is got the material being rich in humic acid and removes foreign material, air-dryly grinds, and crosses 5 mesh sieves for subsequent use.Then the material being rich in humic acid is added KOH, interrupted oscillation, filter-cloth filtering, obtain potassium humate.Finally tea waste and potassium humate are mixed, grind rear mistake 5 mesh sieve, be obtained heavy metals in farmland adjusting control agent.The present invention is made up of tea waste and potassium humate, and the two is all rich in the functional group of absorption, fixing heavy metal, and such as phenolic hydroxyl group, carboxyl etc., effectively can lock the various Active Heavy Metals in agricultural land soil.
Description
Technical field
The present invention relates to a kind of for improveing soil, repair the adjusting control agent and preparation method thereof that heavy metals in farmland pollutes.Being that one is aided with potassium humate by adding the tea such as tealeaves, tea grounds waste in particular, in order to improve soil, administering heavy metal contamination and promoting soil adjusting control agent that increasing crop yield increases income and preparation method thereof.
Background technology
Heavy metal contamination be current area the widest, endanger one of maximum environmental problem.According to statistics, current China heavy-metal contaminated soil is more than 300,000,000 mu, and the grain contamination caused because of arable soil heavy metals exceeding standard is every year up to 1,200 ten thousand tons, and direct economic loss is more than 20,000,000,000 yuan.In soil, poisonous and harmful heavy metallic not only causes assessing index, affects agricultural product security, also by runoff and eluviation polluted surface water and underground water, threatens the drinking water safety of the mankind and healthy further.Only " blood lead exceeds standard " event, just relates to many province ,city and areas such as Shaanxi, Anhui, Henan, Hunan, Fujian, Guangdong, Sichuan, Hunan, Jiangsu, Shandong.Therefore, the reparation of heavy-metal contaminated soil and control cause and pay close attention to widely and study both at home and abroad.
At present, the ultimate principle of remediation of heavy metal-contaminated soil mainly contains solidification and activation, and around these two aspects, scientists proposes physics, chemistry and biological recovery technique.Peripheral doses is one of recovery technique grown up at first, comprise the method for improving the soil, Thermal desorption method, vitrification etc., for polluting the soil remediation successful heavy, area is little, but there is secondary pollution problem, easily cause the structure deteriorate of soil and fertility to decline, the soil larger to contaminated area needs to consume a large amount of manpowers and financial resources.Biological restoration reaches the cleaning action to heavy metal in soil mainly through two kinds of approach: (1) fixes heavy metal by biological action, reduces its movability in edatope and bioavailability; (2) reduction and the cleaning action of heavy metal is reached by bio-absorbable, metabolism.Biological restoration reduced investment, expense be low, be easy to management with operation, do not produce secondary pollution, but repairing efficiency is longer.Chemical redemption is exactly the content applying modifying agent in contaminated soil, increase the soil organism, cation exchange capacity and clay, changes the physico-chemical properties such as pH and Eh, to reduce the biological effectiveness of heavy metal.Chemical fixation relatively economical is easy, but often there is the problem of effect instability or chemical reagent spoiled soil quality.
The various restorative procedures of Integrated comparative heavy-metal contaminated soil find, physical method easily causes Soil structure to destroy, the higher reparation not being suitable for the farmland of low stain degree in big area of cost; It is consuming time oversize that the biological restoration utilizing hyperaccumulative plant to combine microorganism removes heavy metals in farmland, and repair process Planting Crops risk is higher, and China is the country of a cultivated land resource wretched insufficiency, therefore, research and develop a kind of can steady decrease heavy metals in farmland validity and don't affect the normal plantation of farm crop and the heavy metals in farmland native regulatory agent of growth, the soil situation for reply current rigorous seems particularly important.Existing adjusting control agent wide variety, comprises pH adjusting agent, precipitation agent, sorbent material etc., and conventional has lime, zeolite, phosphatic rock, montmorillonite, sulfide and fertilizer etc.To apply for or invention disclosed patent comprises: a kind of adjusting control agent for administering heavy-metal contaminated soil and preparation and application thereof, application number 200710019264.1, publication number CN101003452A; The agent of heavy-metal contaminated soil in-situ immobilization, application number CN200510002116, publication number CN1631561; Hydroxylapatite fixes a method plumbous in heavy metal pollution sediment, application number 200810117375.0, publication number CN101323476A; A preparation method for broad spectrum heavy metal activity deactivator, application number, 201210015667.X; Take humic acid as the method that the microwave exposure gac of additive fixes heavy metal ion, application number 201110194803.1 etc.
China is Chan Cha big country of the world, in a large amount of productions of the deep processed products such as tea drink, instant tea and tea-polyphenol, processing and sales process, and the annual tea waste producing millions of tons.Studies have found that, containing Multiple components such as Mierocrystalline cellulose, hemicellulose, xylogen, tea-polyphenol, protein, amino acid, VITAMIN in the tea such as tealeaves, tea grounds waste, can active adsorption-heavy metal-passivated ion.Wherein tea-polyphenol can account for more than 30% of dry weight of tea leaves, and heavy metal has stronger absorption fixed action, can form complex compound with various heavy and produce precipitation; Mierocrystalline cellulose, hemicellulose and xylogen etc. are rich in carboxyl and hydroxyl, can active adsorption locking heavy metal ion.Existing document and patent in succession report its effect in heavy metal containing wastewater treatment (Yu Mingge etc., tea waste to the biological adsorption progress of heavy metal in solution, Chinese Journal of Applied Ecology, 2010,21(2) 505-513; Process preparation method of tea-leaf power capable and the using method of lead waste water, application number 200910096101.2, publication number CN101507914A).The research of applicant shows, the tea such as tealeaves and tea grounds waste also can be applied in farmland soil heavy metals reparation as one native regulatory agent of good performance.Its applying effectively can reduce the heavy metal content of farm crop overground part or edible part, the health risk after the attenuating mankind eat.
Humic acid be a class aromatic condensed ring extent of polymerization different containing the organic compound of heterocycle, outward appearance is black or yellowish brown.Humic acid is applied in soil can forms organo-mineral colloidal complex with the mineral substance generation aggregation in soil as a kind of hydrophilic organic colloid, this complex body activity is high, the plasma that can bond in soil, makes loosing soil, water moisture self restraint, the physico-chemical property of improvement soil.Containing the various nutritive elements needed for plant-growth in humic acid molecule, in addition, it has stronger exchange, absorption, complex ability to mineral, nutritive element, the element such as the nitrogen N stayed in soil, phosphorus P, potassium K can be held, and these elements of slow releasing are for plant-growth in the process of growth of plant, therefore humic acid has the effect of " class plant hormone ".Generally speaking, humic acid contains multiple functional group as carboxyl, hydroxyl etc., can generate ionic linkage and stay metal to hold, or form title complex with divalence, polyvalent metal with basic metal, alkaline-earth metal, to reduce the transfer ability of metal in soil and plant availability, reduce plant to the absorption of metal.But, also there are some researches show, the humic acid of proton state is manured into soil and may improves heavy metal-polluted soil validity, promote the absorption (Khanetal. of farm crop heavy metal Pb, Cd, HumicAcidsIncreasethePhytoavailabilityofCdandPbtoWheatPl antsCultivatedinFreshlySpiked, ContaminatedSoil, JournalofSoilsandSediments, 2006,6 (4) 236 – 242).Therefore, the present invention adds in alkaline potassium humate to guarantee the solidification effect of heavy metal on the basis of tea waste, promotes the increasing both production and income of farm crop.Potassium humate of the present invention utilizes KOH to extract from the material that sewage treatment plants mud, peat or the compost product etc. that becomes thoroughly decomposed are rich in humic acid to obtain, and achieves the cyclic utilization of waste.With other patents (humic acid organic soil conditioner, organic fertilizer and organic pesticide and production method, application number 201110278602.X; A preparation method for broad spectrum heavy metal activity deactivator, application number, 201210015667.X; Take humic acid as the method that the microwave exposure gac of additive fixes heavy metal ion, application number 201110194803.1) different, the humic acid that the present invention uses is obtained by KOH onestep extraction, and natural in alkalescence, heavy metal passivation effect is better.In sum, the present invention will originate tealeaf, mud, the recycle again of compost product the like waste widely, make heavy metals in farmland adjusting control agent, and its formula composition is all not identical with existing patent of invention with technical thought.This adjusting control agent manufacture craft is simple, non-secondary pollution, heavy metal good fixing effect, can also promote that increasing crop yield increases income simultaneously.
Summary of the invention
The object of the invention is for overcoming that peripheral doses measure cost is high, spoiled soil structure, causing secondary pollution, biological restoration measure repair time is long, be difficult to repair the shortcomings such as high density pollution soil, there is provided a kind of raw material sources extensively, heavy metal passivation effect stablizes, can also promote that agricultural-food increase income, non-secondary pollution, eco-friendly heavy metals in farmland pollute adjusting control agent formula and preparation method thereof, the in-situ immobilization of the agricultural land soil of heavy metal contamination can be widely used in, improve crop yield, the heavy metal reducing agricultural-food eats risk.
For administering the native regulatory agent that farmland soil heavy metals is polluted in the present invention, be made up of material A and material B, material A and material B mass ratio are 1:0.5 ~ 1.5.
Described material A is tea waste, comprises the secondary tea and tea comprehensive processing that produce in tea place residue, Tea Processing process or the tea grounds drinking rear generation; Wherein tea place residue comprises dry branches and fallen leaves and shell fruit stone; Secondary tea bag draws together thick old stalk leaf and tea ash.
Described material B is potassium humate.
Prepare the method for above-mentioned native regulatory agent, comprise the following steps:
Step (1) is got tea waste and is dried for subsequent use; Described tea waste, comprises the secondary tea and tea comprehensive processing that produce in tea place residue, Tea Processing process or the tea grounds drinking rear generation; Wherein tea place residue comprises dry branches and fallen leaves and shell fruit stone; Secondary tea bag draws together thick old stalk leaf and tea ash.
Step (2) is got the material being rich in humic acid and is removed foreign material, air-dryly grinds, and crosses 5 mesh sieves for subsequent use; The described material originates from life sludge of sewage treatment plant being rich in humic acid, peat or the compost product become thoroughly decomposed.
The material that step (2) obtains by step (3) adds the KOH of 0.5mol/L according to the mass volume ratio of 1:2, interrupted oscillation 4h, filter-cloth filtering, spreads out air-dryly can obtain potassium humate by extracting the basic solution that obtains.
The tea waste that step (1) obtains by step (4) and the potassium humate that step (3) obtains mix according to the ratio of mass ratio 1:0.5 ~ 1.5, grind rear mistake 5 mesh sieve, are obtained heavy metals in farmland adjusting control agent.
In aforesaid method, the main purpose of step (3) obtains the active humus class material that can promote crop growth in material, and alkali lye extracts the passivation fixed effect that the material obtained can ensure heavy metal.
In aforesaid method, the tea waste of step (4) and the ratio of potassium humate, can increase according to the difference of soil physico-chemical property (as soil pH, organic matter, cation exchange capacity) or reduce in the scope that formula proposes.
Beneficial effect of the present invention:
(1) repairing effect is good, applied widely.The present invention is the original position adjusting control agent of heavy metal contamination agricultural land soil.This formula is made up of tea waste and potassium humate, and the two is all rich in the functional group of absorption, fixing heavy metal, and such as phenolic hydroxyl group, carboxyl etc., effectively can lock the various Active Heavy Metals in agricultural land soil.After being administered to soil, promote soil pH on the one hand.Improve the sticking crystallized ability of soil particle heavy metal ion, the risk to underground water and the migration of other surrounding mediums can be reduced; On the other hand, adjusting control agent itself can adsorb with heavy metal, chelating, precipitation, the reaction such as fixing, Heavy Metals is transformed to the not available residual form of plant, and the heavy metal that farm crop can absorb reduces greatly; 3rd, containing a large amount of calcium, manganese, zinc, selenium and other trace elements in the useless tea such as tealeaves gurry, can produce antagonistic effect with contents of many kinds of heavy metal ion, resistance control heavy metal enters in farming object by approach such as calcium channels, and crop heavy metal content reduces greatly.By the combined action of above three approach, this adjusting control agent can stablize guarantee agricultural product security.
(2) material source is wide, and production cost is low.Of the present invention two large main matrix are tea waste and potassium humate, be natural materials, to draw materials cheapness, material can obtain this adjusting control agent merely through simple processing, not only can the agricultural land soil of repairing heavy metal pollution, and realize changing waste into resources, meet the call of national recycling economy and energy-saving and emission-reduction.
(3) crop growing state is good, and agricultural output is high.Owing to containing the required material of a large amount of crop growth such as protein, amino acid, VITAMIN, major element and trace element in tea waste, and humic acid can play the function of " plant growth hormones ", the two associating can promote the growth of farm crop and the raising of agricultural output greatly, and increasing crop yield the effect of increasing income is obvious.
Accompanying drawing explanation
Fig. 1 be use that adjusting control agent changes heavy metal-polluted soil Lead speciation affect schematic diagram;
Fig. 2 uses adjusting control agent to affect schematic diagram to soil heavy metal cadmium metamorphosis;
Fig. 3 uses adjusting control agent to affect schematic diagram to potted plant tea tree different tissues fresh weight;
Fig. 4 uses adjusting control agent to affect schematic diagram to potted plant tea tree different tissues lead content;
Fig. 5 uses adjusting control agent to affect schematic diagram to potted plant tea tree different tissues lead content;
Fig. 6 uses adjusting control agent to affect schematic diagram to potted plant tea tree different tissues lead content;
Fig. 7 uses adjusting control agent to affect schematic diagram (experimental plot) to romaine lettuce overground part fresh weight.
Fig. 8 be use that adjusting control agent is plumbous on romaine lettuce overground part, cadmium content affect schematic diagram (experimental plot).
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described:
Embodiment 1
The present invention is a kind of adjusting control agent of heavy metal contamination agricultural land soil, and its effective constituent is tea waste and potassium humate, and concrete preparation process is as follows:
(1) tea place residue (as dry branches and fallen leaves, shell fruit stone etc.) is got; The secondary tea (thick old stalk leaf and tea ash etc., account for into 10% of ultimate production of sampling tea) produced in Tea Processing process; The tea waste such as tea comprehensive processing or the tea grounds drinking rear generation, dries for subsequent use;
(2) get the material that sewage treatment plants mud, peat or the compost product etc. that becomes thoroughly decomposed are rich in humic acid, remove the foreign material such as gravel, grass roots, air-dryly to grind, cross 5 mesh sieves (size of mesh 4mm) for subsequent use;
(3) material step (2) obtained adds the KOH of 0.5mol/L according to the mass volume ratio of 1:2, interrupted oscillation 4h, filter-cloth filtering, spreads out air-dryly can obtain potassium humate by extracting the basic solution that obtains;
(4) material of step (1) and (3) is mixed according to the ratio of mass ratio 1:1.5, grind rear mistake 5 mesh sieve, be obtained heavy metals in farmland adjusting control agent.
Because the ratio in the potassium humate of alkalescence in this adjusting control agent is higher, be therefore applicable to the agricultural land soil of southern china acidity, when using at the scene, add adjusting control agent according to the ratio of soil dry weight 0.05% ~ 0.5%.Namely mixing of turning over can be used for Planting Crops.
Embodiment 2
The present invention is a kind of adjusting control agent of heavy metal contamination agricultural land soil, and its effective constituent is tea waste and potassium humate, and concrete preparation process is as follows:
(1) tea place residue (as dry branches and fallen leaves, shell fruit stone etc.) is got; The secondary tea (thick old stalk leaf and tea ash etc., account for into 10% of ultimate production of sampling tea) produced in Tea Processing process; The tea waste such as tea comprehensive processing or the tea grounds drinking rear generation, dries for subsequent use;
(2) get the material that sewage treatment plants mud, peat or the compost product etc. that becomes thoroughly decomposed are rich in humic acid, remove the foreign material such as gravel, grass roots, air-dryly to grind, cross 5 mesh sieves (size of mesh 4mm) for subsequent use;
(3) material step (2) obtained adds the KOH of 0.5mol/L according to the mass volume ratio of 1:2, interrupted oscillation 4h, filter-cloth filtering, spreads out air-dryly can obtain potassium humate by extracting the basic solution that obtains;
(4) material of step (1) and (3) is mixed according to the ratio of mass ratio 1:0.5, grind rear mistake 5 mesh sieve, be obtained heavy metals in farmland adjusting control agent.
Because in this adjusting control agent, the ratio of tea waste is higher, the ratio of the potassium humate of alkalescence is lower, is therefore comparatively applicable to neutrality and basic farmland soil, when using at the scene, adds adjusting control agent according to the ratio of soil dry weight 0.05% ~ 0.5%.Namely mixing of turning over can be used for Planting Crops.
Embodiment 3
Adjusting control agent is on the impact of Pb in Soil, Cd fractionation
Fuyang City of Zhejiang Province somewhere agricultural soil, pH5.2, organic content 1.6%, soil acidity is comparatively large, and nutrient is held and stayed ability lower, and the movability of heavy metal in soil is higher, and bioavailability is larger.Get this soil appropriate, air-dry rear levigate, cross 2mm sieve for subsequent use.Add the adjusting control agent mixing obtained in the embodiment of the present invention 1 respectively by 0.05%, 0.10% and 0.20% of pedotheque dry weight, each process 3 repetition, is placed in phytotron and cultivates.Regularly water maintenance ground moistening, the chemical form of sampling analysis Pb in Soil, cadmium after 1 month.The BCR tri-step extraction method that morphological analysis adopts the European Union Bureau of Standards to propose.The form of heavy metal in soil is divided into water-soluble state, exchangeable species and carbonate combined (B1) by the method; Iron-manganese oxide combined (B2); Organism and sulfide combined (B3); Residual form (B4).In four kinds of heavy metals formation in soils, movability and bioavailability reduce gradually with the increase of numbering.Use adjusting control agent to the regulating effect of heavy metal-polluted soil as depicted in figs. 1 and 2.The form of plumbous, cadmium is all from the higher form of movability, validity to the heavy metal movability such as organism, sulfide and residual form and the lower form transformation of validity.Wherein, compared with not using the soil of adjusting control agent, the per-cent that the B1 form using the agricultural land soil lead of 0.20% adjusting control agent accounts for total amount is reduced to 1.0% from 9.0%, and residual form is elevated to 46% from 24%; The per-cent that the B1 form of cadmium accounts for total amount is reduced to 7% from 32%, and residual form is elevated to 31% from 8%.As can be seen here, use the content that this adjusting control agent significantly can reduce available heavy metal, promote that it transforms to residual form, thus play the effect of passivation, fixing farmland soil heavy metals.
Embodiment 4
Adjusting control agent is on the impact of tea tree biomass and Metal uptake
First, get tea place, somewhere, Zhejiang Province cleaning soil (pH=4.5, organic content 1.4%) and prepare heavy-metal contaminated soil.The Pitch-based sphere of exogenous heavy metal is respectively: Pb-400mgkg
-1, Cd-5mgkg
-1, Cu-600mgkg
-1, be placed in room temperature environment aging one month.Get this soil appropriate, air-dry rear levigate, cross 2mm sieve for subsequent use.Be the adjusting control agent of 0,0.05%, 0.10% and 0.20% respectively to adding mass ratio in soil and mix, be loaded in plastic tank after the aging week, every barreled soil 3kg, growing way raw tea cutting strain second 4 in consistent 2 years, each process 3 repetition, regularly water maintenance ground moistening, is placed in phytotron and cultivates.The fresh weight of sampling analysis Tea root, stem, leaf and heavy metal content (micro-wave digestion, aas determination) after 3 months.Each process tea tree organizes fresh weight as shown in Figure 3, and heavy metal content as shown in figures 4-6.Along with the increase of adjusting control agent adding proportion, the fresh weight of Tea root, stem, leaf increases thereupon, and the content of lead, cadmium, copper decreases.Compared with not adding the process of adjusting control agent, the adjusting control agent adding 0.2% can make tealeaves fresh weight increase by 68.7%, and plumbi content of tea is from 16.4mgkg
-1drop to 2.9mgkg
-1, tealeaves cadmium content is from 2.5mgkg
-1drop to 0.2mgkg
-1, tealeaves copper content is from 34.0mgkg
-1drop to 10.0mgkg
-1.As can be seen here, this adjusting control agent can promote that increasing crop yield increases income, and significantly suppresses the absorption of farm crop heavy metal simultaneously, reduces the content of edible portion heavy metal.
Embodiment 5
Land for growing field crops regulation and control test
In order to investigate the action effect of adjusting control agent under field conditions further, carried out field regulation and control test in Zhejiang University experimental plot, test farm crop are romaine lettuce.The test plot soil pH chosen about 5.3, total Pb-230mgkg
-1, total Cd-1.1mgkg
-1.Wherein lead content meets national second grade soil ambient quality standard, and cadmium content exceedes country's three grades of standard of soil environment qualities.Because soil pH is lower, the bioavailability of heavy metal is higher, and therefore the farm crop such as planting vegetable exist certain risk.When test is carried out, first experimental plot is smooth, topsoil gong is routed up air-dry, smash, be then divided into 3 blocks (each 3 × 3m), be that namely 0(contrasts respectively to adding mass ratio in each block soil), the adjusting control agent of 0.20% and 0.50%, isolation transitional zone is set between block.Water after fully mixing maintenance ground moistening, plants romaine lettuce after the aging week, and each process arranges 3 repetitions.Plant fresh weight and the heavy metal content of sampling analysis romaine lettuce overground part after 3 months.As shown in Figure 7, the content of lead, cadmium heavy metal as shown in Figure 8 for the fresh weight of different treatment romaine lettuce overground part.Control group romaine lettuce lead content is 0.64mgkg
-1, exceed the plumbous limit standard 0.30mgkg to leaf vegetables in pollutants in food limit standard (GB2762-2005)
-1; Cadmium content is 0.29mgkg
-1, also exceed the cadmium limit standard 0.20mgkg to leaf vegetables in pollutants in food limit standard (GB2762-2005)
-1.Along with native regulatory agent applies the increase of ratio, lead, the cadmium content of romaine lettuce overground part significantly reduce.Adjusting control agent adding proportion is the romaine lettuce of the plot results of 0.50%, and lead, the cadmium content of its overground part are respectively 0.12mgkg
-1and 0.05mgkg
-1, be better than national agricultural product security quality pollution-free vegetable safety requirements (GB18406.1-2001).In addition, the output of romaine lettuce overground part also applies the increase of ratio along with adjusting control agent and increases, and compared with not adding the control group of native regulatory agent, adjusting control agent adding proportion is the romaine lettuce of the plot results of 0.20% and 0.50%, and its output adds 58.9% and 91.5% respectively.As can be seen here, this adjusting control agent significantly can suppress the absorption of farm crop heavy metal, and reduce the content of edible portion heavy metal, promote the increasing both production and income of farm crop, experimental result is satisfactory simultaneously, demonstrates suitability of the present invention and validity further.
Claims (1)
1., for administering the preparation method of the native regulatory agent that farmland soil heavy metals is polluted, this native regulatory agent is made up of material A and material B, and material A and material B mass ratio are 1:0.5 ~ 1.5;
Described material A is tea waste, comprises the secondary tea and tea comprehensive processing that produce in tea place residue, Tea Processing process or the tea grounds drinking rear generation; Wherein tea place residue comprises dry branches and fallen leaves and shell fruit stone; Secondary tea bag draws together thick old stalk leaf and tea ash;
Described material B is potassium humate; It is characterized in that the method comprises the following steps:
Step (1) is got tea waste and is dried for subsequent use; Described tea waste, comprises the secondary tea and tea comprehensive processing that produce in tea place residue, Tea Processing process or the tea grounds drinking rear generation; Wherein tea place residue comprises dry branches and fallen leaves and shell fruit stone; Secondary tea bag draws together thick old stalk leaf and tea ash;
Step (2) is got the material being rich in humic acid and is removed foreign material, air-dryly grinds, and crosses 5 mesh sieves for subsequent use; The described material originates from life sludge of sewage treatment plant being rich in humic acid, peat or the compost product become thoroughly decomposed;
The material that step (2) obtains by step (3) adds the KOH of 0.5mol/L according to the mass volume ratio of 1:2, interrupted oscillation 4h, filter-cloth filtering, spreads out air-dryly can obtain potassium humate by extracting the basic solution that obtains;
The tea waste that step (1) obtains by step (4) and the potassium humate that step (3) obtains mix according to the ratio of mass ratio 1:0.5 ~ 1.5, grind rear mistake 5 mesh sieve, are obtained heavy metals in farmland adjusting control agent.
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