CN103146390B - Passivating agent for controlling Cd pollution of vegetable field, and use method thereof - Google Patents
Passivating agent for controlling Cd pollution of vegetable field, and use method thereof Download PDFInfo
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- CN103146390B CN103146390B CN201310049789.5A CN201310049789A CN103146390B CN 103146390 B CN103146390 B CN 103146390B CN 201310049789 A CN201310049789 A CN 201310049789A CN 103146390 B CN103146390 B CN 103146390B
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Abstract
The invention discloses a passivating agent for controlling the Cd pollution of a vegetable field, and a use method thereof. The passivating agent comprises 9.3-14.0 parts by mass of decomposed peanut bran, 41.3-53.7 parts by mass of lime, and 36.7-50.0 parts by mass of ammonium humate. The use method of the passivating agent comprises the following steps: grinding the decomposed peanut bran, lime and ammonium humate before planting vegetables, sieving by a 60 mesh sieve, fully and uniformly mixing to obtain the passivating agent, carrying out complete basal application of 150-300kg of the above mixture to each 666.7m<2> of the field, plowing, uniformly raking to uniformly mix the passivating agent with polluted soil, spraying water, balancing for 5-10 days, and sowing or transplanting. The passivating agent has the advantages of wide sources of the above raw materials, simple preparation method, effective reduction of the content of available-state cadmium in soil, prevention of Cd from entering the food chain, improvement of the adverse physical and chemical properties of the soil, and realization of the continuous safe utilization of Cd polluted vegetable fields.
Description
Technical field
The invention belongs to soil improvement and environmental protection technical field, be specifically related to a kind of passivator and the using method thereof that control vegetable plot Cd pollution.
Background technology
Along with the quickening of urbanization and process of industrialization, municipal domestic waste and Industrial " three Waste " discharge increasing, in addition the unreasonable of mud, agricultural chemicals, garbage tankage etc. is used, there is Accumulation of heavy metals in a considerable amount of vegetable field soil, particularly cadmium content is apparently higher than soil background, vegetable field soil cadmium pollution is comparatively general, and is main mainly with mild or moderate pollution.Due to south China Soils In The Region slant acidity, heavy metal-polluted soil activity is higher, and its potential information requirement level is also higher.These soil are often to plant leaf vegetables, leaf vegetables is the vegetables being subject to heavy metal contamination and a large amount of accumulation in vivo most, cause leaf vegetables heavy metals exceeding standard phenomenon serious, the most outstanding with the cadmium phenomenon that exceeds standard, have a strong impact on the safety in production of leaf vegetables and the sustainable safe utilization of vegetable field, and have influence on the stability of agroecosystem, one of Main Bottleneck becoming Regional Economic Sustainable Development, if solved not in time, problem will be on the rise.Therefore, carry out controlling to cadmium pollution vegetable plot and repair, improving ecological environment of soil, prevent soil quality from worsening, could agricultural product security be realized, ensureing human and livestock health.
Through groping for many years, the remediation of heavy metal-contaminated soil formed both at home and abroad is a lot, some technology are as also relatively ripe in phytoremediation technology, but this technology is few at the example of China's successful Application, mainly because phytoremediation technology do not meet the actual national conditions of China.The many farmland pollution degree of China based on mild or moderate pollution, by big area, slight pollution farmland stops farming, carries out long phytoremediation or engineering reparation is obviously unpractical.There are some researches show, use water-soluble, diffustivity and biological effectiveness that passivator can reduce heavy metal pollution of soil thing, thus reduce the ability that they enter plant materials, microbe and water body, alleviate the harm to ecotope.Along with urbanization and developing in depth and breadth of economy and deepening continuously of soil restoring technology research and apply, in-situ passivation recovery technique is with low cost, easy to implement because of it, passivator is utilized to be one of effective way can repairing mild or moderate heavy-metal contaminated soil at present to reduce heavy metal-polluted soil to the migration stain risk of food chain, the pollution of area source lighter to the degree caused by rural activity has obvious advantage, and development in recent years is very fast.
In production application, different passivator heavy metal fixed effect depends on the type of heavy metal and the selection of modifying agent.In recent years due to heavy metal contamination increased risk that soil faces, the repairing effect of single organic or inorganic passivator is often not ideal enough, there is the problems such as the large or passivator spoiled soil quality of effect instability, amount of application, be difficult to reach the standard of repairing application.Existing research confirms, the multiple passivator of conbined usage, find out a suitable ratio, these passivator of compound use, the ability such as absorption, precipitation, cohesion, complexing of its heavy metal is greater than single organism or inorganics, improve the repairing effect of passivator, and can make up for each other's deficiencies and learn from each other, play the optimum efficiency of composite passivant.As Ca (H
2p0
4)
2coordinate CaCO
3, effect highly significant when heavy metal-passivated, avoids the disadvantageous effect being used alone the remarkable change soil pH that a kind of passivator brings simultaneously.Organic compost coordinates iron sand etc. to show addition when heavy metal-passivated pollutent, effectively can reduce the biological effectiveness of heavy metal, and exceed the independent role of inorganic passivant.Clay mineral Nature comparison is stablized, and compost coordinates clay mineral can ensure the persistence of passivation effect.Therefore, utilize the absorption of inorganic passivant heavy metal, redox, the complexing of antagonism or precipitating action and organic passivates heavy metal and chelation, organic, inorganic passivant reasonable compatibility, be mixed with efficient, low cost, environmental safety and the passivator less to the negative disturbance of soil, realize having complementary functions of inorganic passivant and organic passivates, and reduce sowing amount and the application times of passivator as far as possible, reach safety, efficiently, the object of lasting passivation Cadmium in Soil, realize nutrient supply simultaneously, the safety in production of soil improvement and agricultural-food, for developing the economy, effectively, the heavy-metal contaminated soil passivation recovery technique of safety provides theory and technology support.
Summary of the invention
The object of the present invention is to provide a kind of passivator and the using method thereof that control vegetable plot Cd pollution.
The technical solution used in the present invention is:
Control the passivator that vegetable plot Cd pollutes, comprise the material of following mass parts: the peanut press pulp become thoroughly decomposed 9.3 ~ 14.0 parts, 41.3 ~ 53.7 parts, lime, ammonium humate 36.7 ~ 50.0 parts.
As one of them preferred version, described passivator comprises following mass parts material: the peanut press pulp become thoroughly decomposed 10 parts, 45 ~ 50 parts, lime, ammonium humate 40 ~ 45 parts.
As one of them preferred version, described passivator comprises following mass parts material: the peanut press pulp become thoroughly decomposed 10 parts, 45 parts, lime, ammonium humate 45 parts.
Described peanut press pulp water content 3.0% ~ 6.0% of becoming thoroughly decomposed, containing organic 82.1% ~ 87.6%, nitrogenous 6.1% ~ 8.0%, containing P
2o
51.0% ~ 1.9%, containing K
2o 1.0% ~ 1.55%.
The described peanut press pulp become thoroughly decomposed is obtained by following methods: first that peanut press pulp is broken, per kilogram peanut press pulp adds 2 ~ 4g organic matter decomposing inoculant, then adds the water of 1 ~ 2 times of quality, seals, fully ferment under room temperature after stirring; Cover with after white hypha until peanut press pulp, show that peanut press pulp becomes thoroughly decomposed, it is air-dry, make its moisture content be 3% ~ 6%.
Described organic matter decomposing inoculant is the organic matter decomposing inoculant that Inst. of Soil & Fertilizer, Guangdong Prov. Academy of Agricultural Science produces.
The above passivator obtains as follows: the peanut press pulp become thoroughly decomposed, lime, ammonium humate are ground, sieved, fully mixes and obtain passivator.
The application on Cd pollution vegetable plot repaired by above-described passivator.Concrete operations are: the passivator of 150 ~ 300kg executed by every mu of ground, turn over, trickle, balance 5 ~ 10 days, can carry out sowing or transplanting.
The invention has the beneficial effects as follows:
(1) passivator of the present invention, utilize the given efficacy of various system component, by the synergy of various composition, reach the effect reducing the active and vegetables heavy metal content of Cadmium in Soil, raising crop yield and quality, the reparation of southern mild or moderate or heavy Cd contamination vegetable field soil can be widely used in.
(2) raw material of the present invention is sufficient, technique is simple, easy to operate, easy enforcement, control expense is lower, the passivation effect sustainable half a year to one year of applied once, it is a kind of safe, effective, lasting heavy metal contamination repair materials, vegetable plot can be imposed on by base separately, use after also can puddling with base fertilizer, use manpower and material resources sparingly.
(3) the present invention effectively make use of this processing of farm products by product of peanut press pulp, is a kind of environmentally friendly passivator hindering control vegetable plot heavy metal contamination, provides a kind of agricultural wastes recycling approach preferably.
Accompanying drawing explanation
Fig. 1 is passivator impact on cadmium adsorption rate under different amounts;
Fig. 2 is contaminated soil 1 pH and DTPA-Cd content situation over time;
Fig. 3 is contaminated soil 2 pH and DTPA-Cd content situation over time.
Embodiment
Peanut press pulp is that the accessory substance after being extracted oil by Semen arachidis hypogaeae forms by adding, and is a kind of high-quality organic fertilizer after fully becoming thoroughly decomposed, and is rich in phosphorus, potassium two kinds of macroelement, and contaminated soil is used, and has fertilizing soil, enhancing crop resists the ability of coercing.
Lime main component is calcium hydroxide, while raising soil pH, significantly can reduce the biological effectiveness of heavy metal, and the calcium carbonate heavy metal formed also has certain passivation.
Ammonium humate is the non-homogeneous aromatic hydroxyl carboxylic salt of a kind of polymer, water-soluble, in alkalescence, pH value is 9.6 ~ 11.0, humic acids content is greater than 45%, containing hydroxyl, carboxyl, methoxyl group, the various active groups such as quinonyl, there is ion-exchange, absorption, complexing, flocculation, dispersion, the several functions such as bonding, soluble state heavy metal content in the soil solution can be reduced, reach passivation heavy metal-polluted soil activity and reduce the effect of heavy metal in the accumulation of plant shoot, and the preserve moisture and fertility ability of soil can be regulated, for plant root growth creates good condition, strengthen the anti-adversity of plant, and then play improvement soil, improve the effect of quality of agricultural product.
Below in conjunction with embodiment, the present invention is further illustrated, but be not limited thereto.
In following examples, raw materials used source is as follows:
The peanut press pulp become thoroughly decomposed: the present embodiment adopts the peanut press pulp of Crop Institute, Guangdong Academy of Agricultural Sciences peanut Comprehensive Experiment factory, prepared by following methods: first peanut press pulp is smashed to pieces, per kilogram peanut press pulp adds 3 g organic matter decomposing inoculants, then 1 kilogram of tap water is taken, trickle is while stir on one side, seal after stirring, being placed in outdoor has sunlight place, fully ferments; Cover with after white hypha until peanut press pulp, show that peanut press pulp becomes thoroughly decomposed, taken out in shady and cool ventilation place air-dry, make its moisture content be 3% ~ 6%, storage, for subsequent use.Its essential nutrient contents is as follows: organic 82.1% ~ 87.6%, nitrogen 6.1% ~ 8.0%, P
2o
51.0% ~ 1.9%, K
2o 1.0% ~ 1.55%, cadmium full dose is 0.076 mg/kg.
Above-mentioned organic matter decomposing inoculant used is the organic matter decomposing inoculant that Inst. of Soil & Fertilizer, Guangdong Prov. Academy of Agricultural Science produces, and product registration card number is: microorganism fertilizer (2010) faces word (1250) number.
Lime: the technical grade white powder white lime that the present embodiment adopts the new Lime Factory in Dan Zhu town, Pingnan County, Guangxi to produce, Ca (OH)
2content >90%; Cadmium full dose is 0.082 mg/kg..
Ammonium humate: the black powdery ammonium humate that the present embodiment adopts Xinjiang Shuanglong Humate and Humic Acid Co., Ltd. to produce, humic acids (butt meter) content >=45.0%, cadmium full dose is 0.065 mg/kg.
embodiment 1 culture experiment
Raw material (kg) is taken: the peanut press pulp 1.0 become thoroughly decomposed, lime 4.5, ammonium humate 4.5 according to following weight.
By milled for above-mentioned raw materials 60 mesh sieves, fully mix and obtain passivator.
passivator is tested the adsorption effect of cadmium:
By different passivator content ratio (0%, 0.5%, 1%, 2.5%, 5%, 7.5%, 10%), take respectively passivator and soil totally 4.000 g in 50ml centrifuge tube, first add containing 0.1 mol/L NaNO
3solution is as supporting electrolyte, pipette 5 mL cadmium storing solutions again, the ultimate density of cadmium in centrifuge tube is made to be 5 mg/L, vibrate 4 h at 25 DEG C on reciprocal shaker, centrifugal after leaving standstill 24 h, filtration, get supernatant liquor and measure cadmium concentration, calculate adsorption rate (content in the amount/solution of adsorption by soil heavy metal).
Passivator is to Cd
2+adsorption effect as shown in Figure 1.Along with the increase of passivator consumption, the adsorption rate of cadmium increases gradually.When passivator consumption be soil heavy 2.5% time, in solution, the adsorption rate of cadmium is increased to 70.8% by 26.1%, and now the rate of change of adsorption rate is maximum.Afterwards, passivator consumption increases further, and the advancing the speed of adsorption rate of cadmium is obviously reduced.
passivator is tested the impact of cadmium activity under different incubation time:
The two kinds of cadmiums adopting the method preliminary examinations passivator of the present invention of indoor cultivation different to pollution level pollute the passivation effect of vegetable field soil cadmium activity.Soil physico-chemical property is as shown in table 1.Wherein soil 1 slant acidity, cadmium content is lower, but cadmium activity is higher; Soil 2 is in neutral, and cadmium content is higher, but cadmium activity is relatively low.
Culture experiment arranges four process: (1) contaminated soil 1 contrasts, and does not use passivator of the present invention in soil; (2) passivator of the present invention is used in contaminated soil 1; (3) contaminated soil 2 contrasts, and does not use passivator of the present invention in contaminated soil 2; (4) passivator of the present invention is used in contaminated soil 2.Each process is read again 4 times.
Take contaminated soil 1, contaminated soil 2 that 500g crosses 20 mesh sieves respectively, per kilogram soil applies 6 g mixtures (3 times for field rate).Passivator and soil fully mix in rear loading polypots, and are contrast with what do not apply passivator, add deionized water.Cultivate at Indoor Dry wet alternate, within every 20 days, gather pedotheque and measure itself pH and DTPA-Cd content, sample 10 times altogether, investigate passivator to the passivation timeliness of cadmium.Changing conditions is as shown in Figures 2 and 3 in time for soil pH and DTPA-Cd content.
Culture experiment result shows, using passivator of the present invention has remarkably influenced to soil pH.Compared with not executing the contrast of passivator, use passivator of the present invention and significantly improve soil pH, reduce soil DTPA-Cd content.After two kinds of contaminated soils use passivator of the present invention, soil pH comparatively contrasts respectively and on average improves 1.58 and 0.52 units, and DTPA-Cd content reduces 33.3% and 13.6%.Visible, this passivator all has good passivation effect to Cadmium in Soil, but is better than neutral soil to the passivation effect of acid soil cadmium.In cultivation during 140 days to 200 days, the soil pH using passivator process of the present invention comparatively reduces early stage, soil DTPA-Cd content is in rising trend, but soil pH is still far above the soil pH not using passivator of the present invention, soil DTPA-Cd content is still lower than the soil not using passivator, particularly contaminated soil 1, its soil pH still maintains higher level, and DTPA-Cd content maintains lower level.Show that the passivator passivation time of the present invention is comparatively lasting, at least sustainable half a year.
the potted plant application of embodiment 2
Adopt potted plant method preliminary examinations passivator of the present invention and using method thereof to the passivation effect of southern vegetable field soil cadmium activity.Select the contaminated soil 1 of embodiment 1 as supplying examination soil, its physico-chemical property is as shown in table 1.
Pot experiment arranges 8 process: (1) contrast 1, does not execute passivator of the present invention, plants red three-coloured amaranth; (2) low consumption, 1 g/kg(passivator/soil), plant red three-coloured amaranth; (3) medium consumption, 5 g/kg(passivator/soil), plant red three-coloured amaranth; (4) higher dosage, 10 g/kg(passivator/soil), plant red three-coloured amaranth.(5) contrast 2, do not execute passivator of the present invention, plantation Plantula Brassicae chinensis; (6) low consumption, 1 g/kg(passivator/soil), plantation Plantula Brassicae chinensis; (7) medium consumption, 5 g/kg(passivator/soil), plantation Plantula Brassicae chinensis; (8) higher dosage, 10 g/kg(passivator/soil), plantation Plantula Brassicae chinensis.Because during earth culture, root system of plant nutrition absorption region is little, therefore the passivator of process (1) ~ (8) executes 3 times that design quantity is field test.Red three-coloured amaranth is cadmium high-selenium corn leaf vegetables kind, and Plantula Brassicae chinensis is cadmium low accumulation leaf vegetables kind, and both are obviously different to the uptake and accumulation ability of cadmium.
Before pot experiment, take raw material (kg) according to following weight: the peanut press pulp 1.0 become thoroughly decomposed, lime 5.0, ammonium humate 4.0, milled 60 mesh sieves, fully mix and obtain passivator.Apply this mixture by different designs consumption per kilogram soil respectively, fill basin after mixture and soil fully being mixed, every basin fills native 5 kg, trickle, balances 7 days, then live red three-coloured amaranth and Plantula Brassicae chinensis seed, every basin final singling 8 strain after emerging.The measure of duration of test cultivation management is consistent with field management, and according to local leaf vegetables fertilizing method, every basin all imposes the azophoska of identical amount.Continuous plantation 3 batches, does not execute passivator for the 2nd, 3 batch, to compare the passivation effect of passivator of the present invention.
To collection period, gather in the crops red three-coloured amaranth and Plantula Brassicae chinensis overground part, measure its fresh weight and Cd content for every batch; And gather pedotheque, in air-dry rear mistake 20 mesh sieve of room temperature, analyze pH and DTPA-Cd content.Test result is as shown in following table 2, table 3.
After using the passivator of the present embodiment, first batch of red three-coloured amaranth and Plantula Brassicae chinensis overground part fresh weight slightly increase, but difference is not remarkable; Use in the process of passivator of the present invention, second batch and the 3rd batch time, two kinds of leaf vegetables the upperground part biomass are all significantly higher than contrast, reach maximum value when medium consumption level.Two kinds of leaf vegetables overground part cadmium content also comparatively contrast significantly reductions, the red three-coloured amaranth overground part cadmium content of medium consumption and high consumption process meets the standard limited value of the Cd<0.2 mg/kg of regulation in national standard " pollutants in food limitation " (GB 2762-2005), Plantula Brassicae chinensis overground part cadmium content is lower than requiring the limit value (0.05 mg/kg) that higher GB 8406.1-2001 " agricultural product security quality pollution-free vegetable safety requirements " specifies, but difference is all not remarkable between the process of high consumption and medium consumption, consider from output and input cost, medium consumption can meet the needs of reparation completely.After using passivator of the present invention, the soil pH of planting red three-coloured amaranth and Plantula Brassicae chinensis all significantly increases, and amplification reaches 0.97 ~ 2.17 unit, and soil DTPA-Cd content comparatively contrasts and reduces 12.9% ~ 44.4%; Particularly in the process of medium consumption and high consumption, soil pH amplification reaches 1.89 ~ 2.17 units, and DTPA-Cd decreases by 40.9% ~ 59.4%.Visible, passivator of the present invention has the passivation effect of highly significant to acid vegetable plot cadmium pollution soil, uses in right amount and can significantly improve soil pH, reduce soil available Cd content, increase three-coloured amaranth and Plantula Brassicae chinensis the upperground part biomass, reduce its absorption to cadmium, and passivation is lasting.
embodiment 3: Field information
Experimental field be in the region that Suburbs of Guangzhou plants leaf vegetables throughout the year, soil physico-chemical property is: soil pH 5.37, organic 28.8 g/kg, full N 1.91 g/kg, alkali-hydrolyzable nitrogen 126 mg/kg, available phosphorus 79 mg/kg, available potassium 112 mg/kg, total cadmium 0.58 mg/kg, DTPA-Cd content 0.33 mg/kg.Three process are established in test: (1) contrasts, and does not use passivator; (2) passivator 100 kg/ mu of the present invention is used; (3) passivator 200 kg/ mu of the present invention is used; (4) passivator 400 kg/ mu of the present invention is used.Each process repeats for 4 times.Every plot area is 10.0 m
2, plantation leaf mustard.
Raw material (kg) is taken: the peanut press pulp 50 become thoroughly decomposed, lime 240, ammonium humate 210 according to following weight.
Before sowing of vegetable, the peanut press pulp become thoroughly decomposed by 50 kg, 240 kg lime, 210 kg ammonium humates pulverize rear mistake 60 mesh sieve respectively, fully mix and obtain passivator, the whole base of passivator is executed, then carry out turning over, harrow even, passivator is mixed with contaminated soil, trickle, balances 5 days and transplants leaf mustard seedling afterwards, continuously plantation 3 batches, 2nd, plant romaine lettuce and Plantula Brassicae chinensis respectively for 3 batches, do not execute passivator.The process of duration of test passivator is applied fertilizer with the control treatment not executing passivator, water, to spray the field management measures such as medicine consistent.
To collection period, gather in the crops leaf vegetables overground part, measure its output and Cd content for every batch; And gather pedotheque, in air-dry rear mistake 20 mesh sieve of room temperature, analyze pH and DTPA-Cd content.Test result is as shown in following table 4, table 5.
The test effect of the present embodiment is as follows:
After utilizing the present embodiment method to test cadmium pollution vegetable field soil, to the test effect of three batches of leaf vegetables and soil respectively as shown in table 4, table 5.For three batches of leaf vegetables, use the process leaf vegetables per mu yield of passivator of the present invention all higher than contrast, when being 200 kg/ mu with consumption, output is the highest, respectively than contrast volume increase 14.1%, 11.3% and 19.6%, three batches of leaf vegetables overground part cadmium contents all do not exceed the standard limited value of the Cd<0.2 mg/kg of regulation in national standard " pollutants in food limitation " (GB 2762-2005), but along with the increase of passivator consumption, three kinds of leaf vegetables overground part cadmium contents are in significantly reducing trend, decrease by 33.3% ~ 73.9%, the limit value that its overground part cadmium content specifies lower than " agricultural product security quality pollution-free vegetable safety requirements " (GB 8406.1-2001) when 200 kg/ mus and 400 kg/ mu process, show that passivator reduces leaf vegetables cadmium content most pronounced effects when 200 ~ 400 kg/ mu consumption.Use with after passivator of the present invention, soil pH and DTPA-Cd content also have significant change, and along with the increase of passivator consumption, soil pH significantly raises, and comparatively contrast increase by 0.83 ~ 1.97 unit; Soil DTPA-Cd content significantly reduces along with the increase of passivator, decreases by 22.2% ~ 56.3%.In addition, every mu of three batches of leaf vegetables output using 200 kg passivator process are apparently higher than 400 kg/ mu passivator process, and the significant difference on both overground part cadmium content not statistically significants, soil DTPA-Cd content is also without significant difference.In general, the process of consumption 200kg/ mu is better than the process of 400 kg/ mus.Therefore, adopt passivator of the present invention to significantly improve soil pH, reduce Cadmium in Soil activity and leaf vegetables overground part cadmium content, and after effect is obvious, has obviously lasting passivation effect for south acidic cadmium polluted vegetable field soil cadmium.
embodiment 4: simultaneous test:
Gather the soil of embodiment 3, pH 5.37, total cadmium 0.58 mg/kg, DTPA-Cd content 0.33 mg/kg.Carry out pot experiment, five process are established in test: (1) contrasts, and does not use passivator; (2) the passivator 3 g/kg(passivator/soil of the embodiment of the present invention 1 is used); (3) the passivator 6 g/kg(passivator/soil of the embodiment of the present invention 1 is used); (4) lime and ammonium humate are joined and are executed: per kilogram soil applies 1.5 g lime and 1.5 g ammonium humates; (5) lime and ammonium humate are joined and are executed: per kilogram soil applies 3 g lime and 3 g ammonium humates.Fill basin after passivator and soil fully being mixed respectively, every basin fills native 5 kg, trickle, balances 5 days, then live white three-coloured amaranth seed, every basin final singling 8 strain after emerging.The measure of duration of test cultivation management is consistent with field management, and according to local leaf vegetables fertilizing method, every basin all imposes the azophoska of identical amount.Continuous plantation 2 batches, does not execute passivator for the 2nd batch, to compare the passivation effect that passivator of the present invention combination is combined with lime+ammonium humate.
To collection period, gather in the crops white three-coloured amaranth overground part, measure its fresh weight and Cd content for every batch; And gather pedotheque, in air-dry rear mistake 20 mesh sieve of room temperature, analyze pH and DTPA-Cd content.Test result is as shown in table 6 below.
Find with the implementation result of passivator of the present invention by comparing lime-ammonium humate combination, both all add two batches of white three-coloured amaranth overground part fresh weights, significantly reduce two batches of romaine lettuce overground part Cd content, comparatively lime and ammonium humate combined treatment have obvious reduction wherein to use the process white three-coloured amaranth overground part Cd content of the embodiment of the present invention 1 passivator.Although it is not remarkable that the effect of increasing production of passivator of the present invention and lime-ammonium humate combine difference, but under same amount level, the reduction Be very effective of its dialogue three-coloured amaranth overground part Cd content is better than lime-ammonium humate combination, shows that the Cd effect of falling of passivator of the present invention is better than lime and ammonium humate and joins and execute.
Two kinds of passivator add two batches of soil pHs all to some extent, reduce soil DTPA-Cd content, but under same amount level, passivator of the present invention is slightly poorer than lime-ammonium humate combination to the lifting effect of soil pH and to the passivation effect of soil Cd activity.But passivator of the present invention is better than lime-ammonium humate combination to the successful reducing white three-coloured amaranth overground part Cd content, and the mechanism that Cd falls in both possibilities is not quite similar.Soil pH more can be made to a certain extent to maintain higher level although lime-ammonium humate combines passivator comparatively of the present invention, soil DTPA-Cd content is also lower than passivator process of the present invention, but from the angle of food safety, passivator of the present invention more effectively can reduce white three-coloured amaranth overground part Cd content, and then reduces its food chain risk.
Above embodiment is only introduces preferred case of the present invention, to those skilled in the art, not deviating from any apparent changes and improvements of carrying out in the scope of spirit of the present invention, all should be regarded as a part of the present invention.
Claims (8)
1. control the passivator that vegetable plot Cd pollutes, it is characterized in that, comprise the material of following mass parts: the peanut press pulp become thoroughly decomposed 9.3 ~ 14.0 parts, 41.3 ~ 53.7 parts, lime, ammonium humate 36.7 ~ 50.0 parts.
2. passivator according to claim 1, is characterized in that, comprises following mass parts material: the peanut press pulp become thoroughly decomposed 10 parts, 45 ~ 50 parts, lime, ammonium humate 40 ~ 45 parts.
3. passivator according to claim 1, is characterized in that, comprises following mass parts material: the peanut press pulp become thoroughly decomposed 10 parts, 45 parts, lime, ammonium humate 45 parts.
4. the passivator according to any one of claims 1 to 3, is characterized in that, described in the peanut press pulp water content 3.0% ~ 6.0% of becoming thoroughly decomposed, containing organic 82.1% ~ 87.6%, nitrogenous 6.1% ~ 8.0%, containing P
2o
51.0% ~ 1.9%, containing K
2o 1.0% ~ 1.55%.
5. the passivator according to any one of claims 1 to 3, it is characterized in that, the described peanut press pulp become thoroughly decomposed is obtained by following methods: first that peanut press pulp is broken, per kilogram peanut press pulp adds 2 ~ 4g organic matter decomposing inoculant, then the water of 1 ~ 2 times of quality is added, seal after stirring, fully ferment under room temperature; Cover with after white hypha until peanut press pulp, it is air-dry, make its moisture content be 3% ~ 6%.
6. the preparation method of passivator described in any one of claims 1 to 3, comprises and the peanut press pulp become thoroughly decomposed, lime, ammonium humate is ground, sieved, fully mix and obtain passivator.
7. the application on Cd pollution vegetable plot repaired by the passivator described in any one of Claims 1 to 5.
8. application according to claim 7, is characterized in that, concrete operations are: the passivator of 150 ~ 300kg executed by every mu of ground, turns over, trickle, balance 5 ~ 10 days, can carry out sowing or transplanting.
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| CN106242895A (en) * | 2016-08-03 | 2016-12-21 | 玉泉 | A kind of fertilizer reducing Cadmium Content of Rice |
| CN106929030A (en) * | 2017-03-22 | 2017-07-07 | 广东工业大学 | A kind of soil passivation modifying agent and preparation method and application |
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| CN102220136B (en) * | 2011-03-30 | 2013-03-20 | 中国科学院亚热带农业生态研究所 | Soil heavy metal composite passivator with humic acid minerals and preparation method thereof |
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2013
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