CN107087451B - method for improving severe soda saline-alkali soil - Google Patents
method for improving severe soda saline-alkali soil Download PDFInfo
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Abstract
The invention discloses methods for improving severe soda saline-alkali soil, which comprise the following steps of firstly diluting concentrated sulfuric acid with water, then flushing the diluted concentrated sulfuric acid and hydrolyzed polymaleic anhydride into the severe soda saline-alkali soil with water, soaking for 1-120 days, then carrying out pulping treatment on the soaked severe soda saline-alkali soil with a paddy field beater, standing after the treatment is finished, discharging water after water and soil are separated, applying bacterial manure 1-30 days before planting, and respectively flushing sodium dodecyl benzene sulfonate, hydrolyzed polymaleic anhydride and bacterial manure with water when changing fresh water 1-15 days, 16-39 days and 40-90 days after planting.
Description
Technical Field
The invention relates to the field of saline-alkali soil treatment, in particular to methods for improving severe soda saline-alkali soil.
Background
The saline-alkali soil is kinds of soil with accumulated salts, which means that the normal growth of crops is influenced by the salts contained in the soil, according to the incomplete statistics of the textbook organization and the grain and agriculture organization of the united nations, the area of the saline-alkali soil all over the world is 9.5438 hundred million hectares, wherein 9913 million hectares are in China, the formation of alkaline earth and alkalized soil in China is mostly related to the accumulation of carbonate in the soil, so the alkalization degree is generally high, and the plants in a serious saline-alkali earth soil area can not survive or have extremely poor survival condition.
The severe soda saline-alkali soil is mainly distributed in Songyuan and Baicheng in West of Jilin province and Daqing and Qizihaar in Heilongjiang province. The soil is mainly characterized in that the pH value of the soil is high, the pH value is generally above 9, some pH values are even as high as 12, the soil is seriously hardened, the soil is hard like stones during drought, the soil becomes pasty when meeting water, and the grass can hardly grow. The carbonate can seriously damage the granular structure of the soil, so that the soil is extremely hardened, is hard like stones during drought and becomes pasty when meeting water. The paddy rice needs to be soaked in water and then is mechanically pulped, if the severe soda saline-alkali soil is not improved, water and soil are not separated after pulping and are in a thin paste state, the seedlings of the paddy rice are quickly settled after transplanting, the normal transplanting cannot be realized, the agricultural production is severely restricted, and huge economic loss is caused to farmers.
The existing methods for improving the severe soda saline-alkali soil mainly comprise chemical improvement methods such as application of concentrated sulfuric acid, humic acid, citric acid, hydrolyzed polymaleic anhydride, desulfurized gypsum and the like, biological improvement methods such as application of microorganisms and planting of salt-tolerant crops and physical improvement methods such as washing with big water and the like, but the problems of high alkalinity, high salt content and severe soil hardening of the severe soda saline-alkali soil cannot be solved simultaneously by the improvement methods, and the problems of long improvement period, large investment, poor economic benefit, poor improvement on the growth state of plants in the current year and the like exist generally. If the problem that the agricultural planting is affected by high salinity, high alkalinity, severe hardening and the like of soil cannot be solved at the same time, the agricultural planting still cannot be normally carried out.
Disclosure of Invention
The invention aims to solve the problems of long soil improvement time, large investment, low economic return rate and the like in the prior art, and provides methods for improving severe soda saline-alkali soil, which are simple and easy to operate and can restore the soil to a state suitable for normal growth of crops in the current year.
The invention provides methods for improving severe soda saline-alkali soil, which comprise the following steps:
step , diluting concentrated sulfuric acid with water, and then flushing the diluted concentrated sulfuric acid and hydrolyzed polymaleic anhydride with water into the severe soda saline-alkali soil for soaking for 1-120 days;
step two: pulping the soaked severe soda saline-alkali soil by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water-soil separation.
Concentrated sulfuric acid with chemical formula of H2SO4 strong mineral acids with high corrosivity are added into the severe soda saline-alkali soil, so that the alkalinity of the soil can be effectively reduced, and the pH value of the soil is rapidly reduced to a range suitable for plant growth.
The hydrolyzed polymaleic anhydride is low molecular weight polyelectrolytes, is orange viscous liquid, has the relative molecular weight of , is 400-800, is nontoxic, is easy to dissolve in water, has high chemical stability and thermal stability, and has the decomposition temperature of over 330 ℃, the hydrolyzed polymaleic anhydride is added into the severe soda saline-alkali soil to improve the solubility of calcium sulfate and calcium carbonate in the soil through the complexation solubilization of the hydrolyzed polymaleic anhydride, so that the quantity of active calcium ions in the soil is improved, the active calcium ions can replace sodium ions tightly adsorbed with soil colloids, the replaced sodium ions are dissociated in the water and chelated with negative high molecular groups to form water-soluble complexes, and are discharged along with irrigation water or absorbed by plants, and the combination of the calcium ions and the soil colloids is favorable for the formation of soil aggregate structures, so that the soil hardening condition is improved.
The severe soda saline-alkali soil is seriously hardened and almost impermeable, so that diluted concentrated sulfuric acid and hydrolyzed polymaleic anhydride are required to permeate into a deeper ploughing layer along with water through mechanical pulping, and the soil improvement effect is improved.
The invention provides methods for improving severe soda saline-alkali soil, which preferably comprises the following steps:
step four: and (3) applying the bacterial manure into the severe soda saline-alkali soil 1-30 days before planting.
The invention provides methods for improving severe soda saline-alkali soil, which preferably comprises the following steps:
and step five, 1-15 days after planting, the hydrolyzed polymaleic anhydride and bacterial manure are flushed into the severe soda saline-alkali soil along with water at times.
The invention provides methods for improving severe soda saline-alkali soil, which preferably comprises the following steps:
step six: after 16-39 days of planting, flushing the hydrolyzed polymaleic anhydride and bacterial manure into the severe soda saline-alkali soil along with water for the second time;
step seven: and (4) after 40-90 days of planting, flushing the hydrolyzed polymaleic anhydride and bacterial manure into the severe soda saline-alkali soil with water for the third time.
The invention provides methods for improving severe soda saline-alkali soil, which comprises the following steps as a preferable mode:
step , diluting concentrated sulfuric acid with water, then flushing the diluted concentrated sulfuric acid and hydrolyzed polymaleic anhydride with water into the severe soda saline-alkali soil, and soaking for 7-20 days;
step two: pulping the soaked severe soda saline-alkali soil by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying the bacterial manure into the severe soda saline-alkali soil 12 days before planting, and planting 12 days after planting;
step five, 3 days after planting, times of flushing the hydrolyzed polymaleic anhydride and bacterial manure into the severe soda saline-alkali soil with water;
step six: 30 days after planting, the hydrolyzed polymaleic anhydride and bacterial manure are flushed into the severe soda saline-alkali soil along with water for the second time;
step seven: and (5) 60 days after planting, flushing the hydrolyzed polymaleic anhydride and bacterial manure into the severe soda saline-alkali soil with water for the third time.
The invention provides methods for improving severe soda saline-alkali soil, wherein in the step , the mass percent of concentrated sulfuric acid is 98%, and the use amount of the concentrated sulfuric acid is 5-200 kg/mu, and the mass percent of hydrolyzed polymaleic anhydride is 50%, and the use amount of the hydrolyzed polymaleic anhydride is 1-50 kg/mu.
The invention provides methods for improving severe soda saline-alkali soil, wherein as an optimal mode, the mass percentage of the hydrolyzed polymaleic anhydride in the fourth step to the seventh step is 50%, the dosage is 1-5 kg/mu, and the dosage of bacterial manure is 1-10 kg/mu.
The invention provides methods for improving severe soda saline-alkali soil, and as an optimal mode, the bacterial manure consists of bacillus subtilis and paenibacillus mucilaginosus, and the effective viable count is more than or equal to 2.0 hundred million/mL.
The bacillus subtilis is kinds of bacillus, is formed by single cells (0.7-0.8) multiplied by (2-3) microns, is uniformly colored, has no capsule, is provided with periphytic flagella, can move, can be quickly colonized and propagated in rice bodies, can effectively reduce the accumulation of pyricularia oryzae and toxins thereof, and can form competition of nutrition and space sites with other harmful bacteria.
The high-activity bacillus mucilaginosus is rich in effective and active bacillus mucilaginosus, can be propagated and grown in soil, can produce metabolites such as organic acid, capsular polysaccharide and the like, destroys the lattice structure of aluminosilicate, insoluble phosphorus compounds and the like, decomposes and releases soluble phosphorus and potassium elements and medium and trace elements such as calcium, sulfur, magnesium, iron, zinc, molybdenum, manganese and the like, improves the soil fertility, provides absorbable and utilizable nutrient elements for crops, simultaneously produces physiological active substances such as gibberellin, cytokinin, microbial enzymes, bacterial polysaccharide and the like, and promotes the nutrient absorption and growth metabolism of the crops.
The invention provides methods for improving severe soda saline-alkali soil, and as a preferred mode, the step five to the step seven of flushing hydrolyzed polymaleic anhydride and bacterial manure into severe soda saline-alkali soil with water comprises two steps:
step A: the hydrolyzed polymaleic anhydride is flushed into the severe soda saline-alkali soil along with water;
and B: and after half an hour, the bacterial manure is flushed into the severe soda saline-alkali soil along with water.
The addition time of the bacterial manure is half an hour later than that of the hydrolyzed polymaleic anhydride, so that the applicability of the soil can be improved by hydrolyzing the polymaleic anhydride, and the survival rate of the strains can be improved.
The invention provides methods for improving severe soda saline-alkali soil, wherein as a preferable mode, step and step five to step seven further comprise the step of flushing sodium dodecyl benzene sulfonate and hydrolyzed polymaleic anhydride into the severe soda saline-alkali soil with water, wherein the mass percentage of the sodium dodecyl benzene sulfonate is 30 percent, the dosage is 0.5 to 10 kg/mu, the sodium dodecyl benzene sulfonate is white or light yellow powder or flaky solid, and the molecular formula is C18H29NaO3The sodium dodecyl benzene sulfonate as anionic surfactants has good surface activity and strong hydrophilicity, effectively reduces the tension of an oil-water interface, achieves emulsification, can enable hydrolyzed polymaleic anhydride to be better dispersed in water, and better improves the soil hardening condition.
According to the invention, the pH value of the severe soda saline-alkali soil is reduced through strong acidity of concentrated sulfuric acid, the soil is conditioned into subacidity, a large amount of carbonate ions in the soil are removed, the quantity of active calcium ions in the soil is increased through complexation solubilization of hydrolytic maleic anhydride, the condition of a soil plate is preliminarily improved, the soil is adjusted for multiple times through the synergistic effect of sodium dodecyl benzene sulfonate, hydrolytic polymaleic anhydride and bacterial manure, and the flora structure and physicochemical indexes of the soil are further improved in step , so that the severe soda saline-alkali soil can be effectively treated, the operation is simple and easy to implement, the investment is small, and the condition that the soil is suitable for normal growth of crops can be recovered in the current year.
Detailed Description
Example 1
The experiment base of the ecological agriculture science and technology company of the great river of Baicheng Zheng361699, the experiment land is severe soda saline-alkali soil, and rice is planted after improvement. The pH value of the soil is 10.8, the total salt content is 0.6%, and the soil is seriously hardened. The experimental plot was divided evenly into 4 parts, which were labeled as zone a, zone B, zone C, and zone D.
The experimental area A is improved according to the following steps:
step , diluting 98 mass percent concentrated sulfuric acid with water, and then sequentially flushing the diluted concentrated sulfuric acid and 50 mass percent hydrolyzed polymaleic anhydride with water into the experimental plot area A, wherein the dosages of the concentrated sulfuric acid and the hydrolyzed polymaleic anhydride are 100 kg/mu and 3 kg/mu respectively, and soaking for 15 days;
step two: pulping the soaked area A by using a paddy field pulping machine;
step three: standing after pulping, discharging water after water and soil separation, and then transplanting rice seedlings.
The experimental area B is improved according to the following steps:
step , diluting 98% concentrated sulfuric acid by mass with water, and then flushing the diluted concentrated sulfuric acid into an experimental area B with water, wherein the dosage of the concentrated sulfuric acid is 100 kg/mu, and soaking for 15 days;
step two: pulping the soaked area B by using a paddy field pulping machine;
step three: standing after pulping, discharging water after water and soil separation, and then transplanting rice seedlings.
The experimental plot C is improved according to the following steps:
, flushing 50 percent of hydrolyzed polymaleic anhydride by mass with water into the experimental area C according to the use amount of 3 kg/mu, and soaking for 15 days;
step two: pulping the soaked area C by using a paddy field pulping machine;
step three: standing after pulping, discharging water after water and soil separation, and then transplanting rice seedlings.
The experimental plot D is improved according to the following steps:
step , soaking the region D in clear water for 15 days;
step two: pulping the soaked area D by a paddy field pulping machine;
step three: standing after pulping, discharging water after water and soil separation, and then transplanting rice seedlings.
The other field management modes of the area A, the area B, the area C and the area D of the experimental area are the same.
The results of the rice survey of different areas of the experimental plot are shown in Table 1.
TABLE 1 survey results of rice
As can be seen from the data in Table 1, compared with the rice planted in the severe soda saline-alkali soil improved by other methods, the dead seedling rate of the rice is reduced by at least 92%, the yield is increased by at least 500%, the tillering rate of the rice is increased from 0 to 2.0, the plant height is increased by at least 92%, the thousand seed weight is increased by at least 31%, and the quality of the rice is correspondingly improved; meanwhile, the pH value and the salt content of the soil are obviously reduced, the hardening condition is obviously improved, and the soil is restored to a state suitable for normal growth of crops.
Example 2
The experiment base of the ecological agriculture science and technology company of the great river of Baicheng Zheng361699, the experiment land is severe soda saline-alkali soil, and rice is planted after improvement. The pH value of the soil is 11.5, the total salt content is 0.8%, and the soil is seriously hardened. The experimental plot was divided evenly into 4 parts, which were labeled as zone a, zone B, zone C, and zone D.
The experimental area A is improved according to the following steps:
step , diluting 98 mass percent concentrated sulfuric acid with water, and then sequentially flushing the diluted concentrated sulfuric acid and 50 mass percent hydrolyzed polymaleic anhydride with water into the experimental plot area A, wherein the use amounts of the concentrated sulfuric acid and the hydrolyzed polymaleic anhydride are 150 kg/mu and 15 kg/mu respectively, and soaking for 15 days;
step two: pulping the soaked area A by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: and 3 days before rice transplanting, the bacterial manure is flushed into the area A along with water according to the dosage of 5 kg/mu, and the rice transplanting is carried out after 3 days.
The experimental area B is improved according to the following steps:
step , diluting 98 percent concentrated sulfuric acid by mass with water, then flushing the diluted concentrated sulfuric acid into an experimental area A with water, wherein the dosage of the concentrated sulfuric acid is 150 kg/mu, and soaking for 15 days;
step two: pulping the soaked area B by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: and 3 days before rice transplanting, the bacterial manure is flushed into the area B along with water according to the dosage of 5 kg/mu, and the rice transplanting is carried out after 3 days.
The experimental plot C is improved according to the following steps:
, flushing 50 percent of hydrolyzed polymaleic anhydride in percentage by mass into the experimental area C with water according to the use amount of 15 kg/mu, and soaking for 15 days;
step two: pulping the soaked area C by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: and 3 days before rice transplanting, the bacterial manure is flushed into the area C along with water according to the use amount of 5 kg/mu, and the rice transplanting is carried out after 3 days.
The experimental plot D is improved according to the following steps:
step , soaking the region D in clear water for 15 days;
step two: pulping the soaked area D by a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: and 3 days before rice transplanting, the bacterial manure is flushed into the area D with water according to the use amount of 5 kg/mu, and the rice transplanting is carried out after 3 days.
The other field management modes of the area A, the area B, the area C and the area D of the experimental area are the same.
The results of the rice survey of different areas of the experimental plot are shown in Table 2.
TABLE 2 survey results of rice
As can be seen from the data in Table 2, compared with the rice planted in the severe soda saline-alkali soil improved by other methods, the dead seedling rate of the rice is reduced by at least 98%, the yield is increased by at least 242%, the tillering rate of the rice is increased from 0 to 2.5, the plant height is increased by at least 98%, the thousand seed weight is increased by at least 23%, and the quality of the rice is correspondingly improved; meanwhile, the pH value and the salt content of the soil are obviously reduced, the hardening condition is obviously improved, and the soil is restored to a state suitable for normal growth of crops.
Example 3
The experiment base of the ecological agriculture science and technology company of the great river of Baicheng Zheng361699, the experiment land is severe soda saline-alkali soil, and rice is planted after improvement. The pH value of the soil is 11.3, the total salt content is 0.7%, and the soil is seriously hardened. The experimental plot was divided evenly into 4 parts, which were labeled as zone a, zone B, zone C, and zone D.
The experimental area A is improved according to the following steps:
step , diluting 98 mass percent concentrated sulfuric acid with water, then flushing the diluted concentrated sulfuric acid, 50 mass percent hydrolyzed polymaleic anhydride and 30 mass percent sodium dodecyl benzene sulfonate into the experimental area A with water, wherein the dosages of the concentrated sulfuric acid, the hydrolyzed polymaleic anhydride and the sodium dodecyl benzene sulfonate are 100 kg/mu, 30 kg/mu and 10 kg/mu respectively, and soaking for 15 days;
step two: pulping the soaked area A by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying bacterial manure into the area A according to the dosage of 6 kg/mu 12 days before rice transplanting, and transplanting rice 12 days later;
step five, 3 days after rice transplanting, flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area A with water according to the use amounts of 1 kg/mu and 5 kg/mu respectively at times, and flushing bacterial manure into the area A with water according to the use amount of 10 kg/mu after half an hour;
step six: 35 days after rice transplanting, respectively flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area A with water according to the use amounts of 1 kg/mu and 5 kg/mu for the second time, and flushing bacterial manure into the area A with water according to the use amount of 10 kg/mu after half an hour;
step seven: and (3) after 60 days of rice transplanting, respectively flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area A with water according to the use amounts of 1 kg/mu and 5 kg/mu for the third time, and flushing bacterial manure into the area A with water according to the use amount of 10 kg/mu after half an hour.
The experimental area B is improved according to the following steps:
step , diluting 98 percent by mass of concentrated sulfuric acid with water, and then flushing the diluted concentrated sulfuric acid into an experimental area B with water, wherein the dosage of the concentrated sulfuric acid is 100 kg/mu, and soaking for 15 days;
step two: pulping the soaked area B by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying bacterial manure into the area B according to the dosage of 6 kg/mu 12 days before rice transplanting, and transplanting rice 12 days later;
step five, 3 days after rice transplanting, the bacterial manure is flushed into the area B with water according to the dosage of 10 kg/mu at times;
step six: after 35 days of rice transplanting, the bacterial manure is flushed into the area B with water according to the using amount of 10 kg/mu for the second time;
step seven: and (5) after rice is transplanted for 60 days, the bacterial manure is flushed into the area B with water according to the using amount of 10 kg/mu for the third time.
The experimental plot C is improved according to the following steps:
step , washing 50 mass percent of hydrolyzed polymaleic anhydride and 30 mass percent of sodium dodecyl benzene sulfonate into the experimental area C with water, wherein the dosages of the hydrolyzed polymaleic anhydride and the sodium dodecyl benzene sulfonate are respectively 30 kg/mu and 10 kg/mu, and soaking for 15 days;
step two: pulping the soaked area C by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying bacterial manure into the area C according to the dosage of 6 kg/mu 12 days before rice transplanting, and transplanting rice 12 days later;
step five, 3 days after rice transplanting, flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area C with water according to the use amounts of 1 kg/mu and 5 kg/mu respectively at times, and flushing bacterial manure into the area C with water according to the use amount of 10 kg/mu after half an hour;
step six: 35 days after rice transplanting, respectively flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area C with water according to the use amounts of 1 kg/mu and 5 kg/mu for the second time, and flushing bacterial manure into the area C with water according to the use amount of 10 kg/mu after half an hour;
step seven: and (3) after 60 days of rice transplanting, respectively flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area C with water according to the use amounts of 1 kg/mu and 5 kg/mu for the third time, and flushing bacterial manure into the area C with water according to the use amount of 10 kg/mu after half an hour.
The experimental plot D is improved according to the following steps:
step , soaking the region D in clear water for 15 days;
step two: pulping the soaked area D by a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying bacterial manure into the area D according to the dosage of 6 kg/mu 12 days before rice transplanting, and transplanting rice 12 days later;
step five, 3 days after rice transplanting, flushing bacterial manure into the area D with water according to the dosage of 10 kg/mu at times;
step six: after 35 days of rice transplanting, the bacterial manure is flushed into the area D with water according to the using amount of 10 kg/mu for the second time;
step seven: and (5) after rice is transplanted for 60 days, the bacterial manure is flushed into the area D with water according to the using amount of 10 kg/mu for the third time.
The other field management modes of the area A, the area B, the area C and the area D of the experimental area are the same.
The results of the rice survey of different areas of the experimental plot are shown in Table 3.
TABLE 3 survey results of rice
As can be seen from the data in Table 3, compared with the rice planted in the severe soda saline-alkali soil improved by other methods, the rice death rate is reduced by at least 96%, the yield is increased by at least 277%, the tillering rate of the rice is increased from 0 to 2.5, the plant height is increased by at least 105%, the thousand seed weight is increased by at least 36%, and the rice quality is correspondingly improved; meanwhile, the pH value and the salt content of the soil are obviously reduced, the hardening condition is obviously improved, and the soil is restored to a state suitable for normal growth of crops.
Example 4
The Baicheng Zheng361699, county Zhennan sheep farm, the experimental land is severe soda saline-alkali soil, and sunflower is planted after improvement. The pH value of the soil is 9.8, the total salt content is 0.7%, and the soil is seriously hardened. The experimental plot was divided evenly into 4 parts, which were labeled as zone a, zone B, zone C, and zone D.
The experimental area A is improved according to the following steps:
step , diluting 98 mass percent concentrated sulfuric acid with water, and then sequentially flushing the diluted concentrated sulfuric acid and 50 mass percent hydrolyzed polymaleic anhydride with water into the experimental plot area A, wherein the dosages of the concentrated sulfuric acid and the hydrolyzed polymaleic anhydride are respectively 50 kg/mu and 15 kg/mu, and soaking for 7 days;
step two: pulping the soaked area A by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying bacterial manure into the area A5 days before sunflower sowing according to the use amount of 1 kg/mu, and sowing the sunflower 5 days later;
step five: 3 days after the sunflower is sowed, bacterial manure and 50% of hydrolyzed polymaleic anhydride in percentage by mass are applied to the area A, the dosages of the bacterial manure and the hydrolyzed polymaleic anhydride are respectively 1 kg/mu and 5 kg/mu, the hydrolyzed polymaleic anhydride is applied firstly, and the bacterial manure is applied after half an hour.
The experimental area B is improved according to the following steps:
step , diluting 98 percent by mass of concentrated sulfuric acid with water, and then flushing the diluted concentrated sulfuric acid with water into an experimental area B, wherein the dosage of the concentrated sulfuric acid is 50 kg/mu, and soaking for 7 days;
step two: pulping the soaked area B by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying bacterial manure into the area B according to the dosage of 1 kg/mu 5 days before sunflower sowing, and sowing the sunflower 5 days later;
step five: and 3 days after the sunflower is sowed, applying bacterial manure into the B according to the dosage of 1 kg/mu.
The experimental plot C is improved according to the following steps:
, flushing 50 percent of hydrolyzed polymaleic anhydride in percentage by mass into the experimental area C with water according to the use amount of 15 kg/mu, and soaking for 7 days;
step two: pulping the soaked area C by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying bacterial manure into the area C5 days before sunflower sowing according to the use amount of 1 kg/mu, and sowing the sunflower 5 days later;
step five: and 3 days after the sunflower is sown, applying bacterial manure and 50 mass percent of hydrolyzed polymaleic anhydride into the area C, wherein the use amounts of the bacterial manure and the hydrolyzed polymaleic anhydride are 1 kg/mu and 5 kg/mu respectively, the hydrolyzed polymaleic anhydride is applied firstly, and the bacterial manure is applied after half an hour.
The experimental plot D is improved according to the following steps:
step , soaking the experimental plot D in clear water for 7 days;
step two: pulping the soaked area D by a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying bacterial manure into the area D according to the dosage of 1 kg/mu 5 days before sunflower sowing, and sowing the sunflower 5 days later;
step five: and 3 days after the sunflower is sowed, applying bacterial manure into the area D according to the dosage of 1 kg/mu.
The other field management modes of the area A, the area B, the area C and the area D of the experimental area are the same.
The results of the sunflower survey of the different experimental areas are shown in table 4.
TABLE 4 sunflower survey results
As can be seen from the data in Table 4, compared with the sunflower planted in the severe soda saline-alkali soil improved by the method, the yield of the sunflower is increased by at least 67 percent and can reach the level of medium yield, the thousand-grain weight of the sunflower is increased by at least 38 percent, and the quality of the sunflower is correspondingly improved; meanwhile, the pH value and the salt content of the soil are obviously reduced, the hardening condition is obviously improved, and the soil is restored to a state suitable for normal growth of crops.
Example 5
The Baicheng Zheng361699, county Zhennan sheep farm, the experimental land is severe soda saline-alkali soil, and sunflower is planted after improvement. The pH value of the soil is 10.1, the total salt content is 0.7%, and the soil is seriously hardened. The experimental plot was divided evenly into 4 parts, which were labeled as zone a, zone B, zone C, and zone D.
The experimental area A is improved according to the following steps:
step , diluting 98 mass percent concentrated sulfuric acid with water, then flushing the diluted concentrated sulfuric acid, 50 mass percent hydrolyzed polymaleic anhydride and 30 mass percent sodium dodecyl benzene sulfonate into the experimental area A with water, wherein the dosages of the concentrated sulfuric acid, the hydrolyzed polymaleic anhydride and the sodium dodecyl benzene sulfonate are 5 kg/mu, 1 kg/mu and 0.5 kg/mu respectively, and soaking for 1 day;
step two: pulping the soaked area A by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: 1 day before sunflower sowing, applying bacterial manure into the area A according to the using amount of 1 kg/mu, and sowing the sunflower 1 day later;
step five, 1 day after the sunflower is sowed, flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area A with water according to the use amounts of 1 kg/mu and 0.5 kg/mu respectively at times, and flushing bacterial manure into the area A with water according to the use amount of 1 kg/mu after half an hour;
step six: 16 days after the sunflower is sowed, respectively flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area A with water according to the using amounts of 1 kg/mu and 0.5 kg/mu for the second time, and flushing bacterial manure into the area A with water according to the using amount of 1 kg/mu after half an hour;
step seven: and (3) after the sunflowers are sown for 40 days, flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area A with water according to the use amounts of 1 kg/mu and 0.5 kg/mu for the third time, and flushing bacterial manure into the area A with water according to the use amount of 1 kg/mu after half an hour.
The experimental area B is improved according to the following steps:
step , diluting 98 percent by mass of concentrated sulfuric acid with water, and then flushing the diluted concentrated sulfuric acid with water into an experimental area B, wherein the dosage of the concentrated sulfuric acid is 5 kg/mu, and soaking for 1 day;
step two: pulping the soaked area B by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: 1 day before sunflower sowing, applying bacterial manure into the area B according to the dosage of 1 kg/mu, and sowing the sunflower 1 day later;
step five, 1 day after the sunflower is sowed, the bacterial manure is flushed into the area B with water according to the dosage of 1 kg/mu at the th time;
step six: 16 days after the sunflower is sowed, the bacterial manure is flushed into the area B with water according to the use amount of 1 kg/mu for the second time;
step seven: and (4) after the sunflowers are sowed for 40 days, and the bacterial manure is flushed into the area B along with water according to the use amount of 1 kg/mu for the third time.
The experimental plot C is improved according to the following steps:
step , washing 50 mass percent of hydrolyzed polymaleic anhydride and 30 mass percent of sodium dodecyl benzene sulfonate into the experimental area C with water, wherein the dosages of the hydrolyzed polymaleic anhydride and the sodium dodecyl benzene sulfonate are 1 kg/mu and 0.5 kg/mu respectively, and soaking for 1 day;
step two: pulping the soaked area C by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: 1 day before sunflower sowing, applying bacterial manure into the area C according to the dosage of 1 kg/mu, and sowing the sunflower 1 day later;
step five, 1 day after the sunflower is sowed, flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area C with water according to the use amounts of 1 kg/mu and 0.5 kg/mu respectively at times, and flushing bacterial manure into the area C with water according to the use amount of 1 kg/mu after half an hour;
step six: 16 days after the sunflower is sowed, respectively flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area C with water according to the use amounts of 1 kg/mu and 0.5 kg/mu for the second time, and flushing bacterial manure into the area C with water according to the use amount of 1 kg/mu after half an hour;
step seven: and (3) after the sunflowers are sown for 40 days, flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area C with water according to the use amounts of 1 kg/mu and 0.5 kg/mu for the third time, and flushing bacterial manure into the area C with water according to the use amount of 1 kg/mu after half an hour.
The experimental plot D is improved according to the following steps:
step , soaking the region D in clear water for 1 day;
step two: pulping the soaked area D by a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: 1 day before sunflower sowing, applying bacterial manure into the area D according to the dosage of 1 kg/mu, and transplanting rice after 1 day;
step five, 1 day after the sunflower is sowed, the bacterial manure is flushed into the area D with water according to the dosage of 1 kg/mu at the th time;
step six: 16 days after the sunflower is sowed, the bacterial manure is flushed into the area D with water according to the use amount of 1 kg/mu for the second time;
step seven: and (4) after the sunflowers are sowed for 40 days, the bacterial manure is flushed into the area D with water according to the use amount of 1 kg/mu for the third time.
The other field management modes of the area A, the area B, the area C and the area D of the experimental area are the same.
The results of the sunflower survey of the different experimental areas are shown in table 5.
TABLE 5 sunflower survey results
As can be seen from the data in Table 5, compared with the sunflower planted in the severe soda saline-alkali soil improved by the method, the yield of the sunflower is increased by at least 65 percent and can reach the level of medium yield, the thousand-grain weight of the sunflower is increased by at least 33 percent, and the quality of the sunflower is correspondingly improved; meanwhile, the pH value and the salt content of the soil are obviously reduced, the hardening condition is obviously improved, and the soil is restored to a state suitable for normal growth of crops.
Example 6
Baicheng Zhenchang 361699, county, the experimental land is severe soda saline-alkali soil, and sorghum is planted after improvement. The pH value of the soil is 10.0, the total salt content is 0.5%, and the hardening is serious. The experimental plot was divided evenly into 4 parts, which were labeled as zone a, zone B, zone C, and zone D.
The experimental area A is improved according to the following steps:
step , diluting 98 mass percent concentrated sulfuric acid with water, then flushing the diluted concentrated sulfuric acid, 50 mass percent hydrolyzed polymaleic anhydride and 30 mass percent sodium dodecyl benzene sulfonate into the experimental area A with water, wherein the dosages of the concentrated sulfuric acid, the hydrolyzed polymaleic anhydride and the sodium dodecyl benzene sulfonate are respectively 30 kg/mu, 15 kg/mu and 10 kg/mu, and soaking for 20 days;
step two: pulping the soaked area A by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying bacterial manure into the area A according to the using amount of 6 kg/mu 3 days before sorghum seeding, and seeding the sorghum after 3 days;
step five, after sorghum is sowed for 4 days, times of flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area A with water according to the use amounts of 1 kg/mu and 5 kg/mu respectively, and flushing bacterial manure into the area A with water according to the use amount of 10 kg/mu after half an hour;
step six: 35 days after the sorghum is sowed, respectively flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area A with water according to the use amounts of 1 kg/mu and 5 kg/mu for the second time, and flushing bacterial manure into the area A with water according to the use amount of 10 kg/mu after half an hour;
step seven: and (3) after the sorghum is sowed for 60 days, flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area A with water according to the use amounts of 1 kg/mu and 5 kg/mu for the third time, and flushing bacterial manure into the area A with water according to the use amount of 10 kg/mu after half an hour.
The experimental area B is improved according to the following steps:
step , diluting 98% concentrated sulfuric acid by mass with water, and then flushing the diluted concentrated sulfuric acid into the experimental area A with water, wherein the dosage of the concentrated sulfuric acid is 30 kg/mu respectively, and soaking for 20 days;
step two: pulping the soaked area B by using a paddy field pulping machine;
step three: standing after pulping, discharging water after water and soil separation, and sowing the sorghum.
The experimental plot C is improved according to the following steps:
, flushing 50 percent of hydrolyzed polymaleic anhydride by mass into the experimental area C with water according to the use amount of 15 kg/mu, and soaking for 20 days;
step two: pulping the soaked area C by using a paddy field pulping machine;
step three: standing after pulping, discharging water after water and soil separation, and sowing sorghum;
fourthly, 4 days after the sorghum is sowed, times of flushing the hydrolyzed polymaleic anhydride with the mass percent of 50 percent into the area C along with water according to the dosage of 5 kg/mu;
step five: after the sorghum is sowed for 35 days, the hydrolyzed polymaleic anhydride with the mass percentage of 50 percent is flushed into the area C with water according to the use amount of 5 kg/mu for the second time;
step six: and (3) after the sorghum is sowed for 60 days, flushing 50% of hydrolyzed polymaleic anhydride in percentage by mass into the area C with water according to the dosage of 5 kg/mu for the third time.
The experimental plot D is improved according to the following steps:
step , simultaneously flushing 50 percent of hydrolyzed polymaleic anhydride and 30 percent of sodium dodecyl benzene sulfonate into an experimental area D, respectively using 15 kg/mu and 10 kg/mu of hydrolyzed polymaleic anhydride and sodium dodecyl benzene sulfonate, and soaking for 20 days;
step two: pulping the soaked area D by a paddy field pulping machine;
step three: standing after pulping, discharging water after water and soil separation, and sowing sorghum;
fourthly, 4 days after the sorghum is sowed, flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area D with water at the same time according to the use amount of 1 kg/mu and 5 kg/mu at times;
step five: after the sorghum is sowed for 35 days, 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride are respectively flushed into the area D with water according to the use amounts of 1 kg/mu and 5 kg/mu for the second time;
step six: and after the sorghum is sowed for 60 days, 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride are flushed into the area D with water at the same time according to the use amounts of 1 kg/mu and 5 kg/mu for the third time.
The other field management modes of the area A, the area B, the area C and the area D of the experimental area are the same.
The results of the regional sorghum survey for the different experimental areas are shown in table 6.
TABLE 6 sorghum survey results
As can be seen from the data in Table 6, compared with the sorghum planted in the severe soda saline-alkali soil improved by the method, the yield of the sorghum is increased by at least 74%, the yield can reach the level of medium yield, the thousand-grain weight of the sorghum is increased by at least 25%, and the quality of the sorghum is correspondingly improved; meanwhile, the pH value and the salt content of the soil are obviously reduced, the hardening condition is obviously improved, and the soil is restored to a state suitable for normal growth of crops.
Example 7
Baicheng Zhenchang 361699, county, the experimental land is severe soda saline-alkali soil, and sorghum is planted after improvement. The pH value of the soil is 10.5, the total salt content is 0.6%, and the soil is seriously hardened. The experimental plot was divided evenly into 4 parts, which were labeled as zone a, zone B, zone C, and zone D.
The experimental area A is improved according to the following steps:
step , diluting 98 mass percent concentrated sulfuric acid with water, then flushing the diluted concentrated sulfuric acid, 50 mass percent hydrolyzed polymaleic anhydride and 30 mass percent sodium dodecyl benzene sulfonate into the experimental area A with water, wherein the dosages of the concentrated sulfuric acid, the hydrolyzed polymaleic anhydride and the sodium dodecyl benzene sulfonate are 200 kg/mu, 50 kg/mu and 10 kg/mu respectively, and soaking for 120 days;
step two: pulping the soaked area A by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying bacterial manure into the area A according to the dosage of 10 kg/mu 30 days before sorghum seeding, and seeding the sorghum 30 days later;
step five, after sorghum is sowed for 15 days, times of flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area A with water according to the use amounts of 10 kg/mu and 5 kg/mu respectively, and flushing bacterial manure into the area A with water according to the use amount of 10 kg/mu after half an hour;
step six: after sorghum is sowed 39 days, 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride are respectively flushed into the area A with water according to the use amount of 10 kg/mu and 5 kg/mu for the second time, and bacterial manure is flushed into the area A with water according to the use amount of 10 kg/mu after half an hour;
step seven: and (3) after the sorghum is sowed for 90 days, flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area A with water according to the use amounts of 10 kg/mu and 5 kg/mu for the third time, and flushing bacterial manure into the area A with water according to the use amount of 10 kg/mu after half an hour.
The experimental area B is improved according to the following steps:
step , diluting 98 percent by mass of concentrated sulfuric acid with water, and then flushing the diluted concentrated sulfuric acid with water into an experimental area B, wherein the dosage of the concentrated sulfuric acid is 200 kg/mu, and soaking for 120 days;
step two: pulping the soaked area B by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying bacterial manure into the area B according to the dosage of 10 kg/mu 30 days before sorghum seeding, and seeding the sorghum 30 days later;
step five, after the sorghum is sowed for 15 days, the bacterial manure is flushed into the area B with water according to the dosage of 10 kg/mu at the th time;
step six: after sorghum is sowed for 39 days, the bacterial manure is flushed into the area B with water according to the using amount of 10 kg/mu for the second time;
step seven: and (3) after the sorghum is sowed for 90 days, and the bacterial manure is flushed into the area B with water according to the using amount of 10 kg/mu for the third time.
The experimental plot C is improved according to the following steps:
step , washing 50 mass percent of hydrolyzed polymaleic anhydride and 30 mass percent of sodium dodecyl benzene sulfonate into the experimental plot area C with water, wherein the dosages of the hydrolyzed polymaleic anhydride and the sodium dodecyl benzene sulfonate are respectively 50 kg/mu and 10 kg/mu, and soaking for 120 days;
step two: pulping the soaked area C by using a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying bacterial manure into the area C according to the dosage of 10 kg/mu 30 days before sorghum seeding, and seeding the sorghum 30 days later;
step five, after sorghum is sowed for 15 days, times of flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area C with water according to the use amounts of 10 kg/mu and 5 kg/mu respectively, and flushing bacterial manure into the area C with water according to the use amount of 10 kg/mu after half an hour;
step six: after sorghum is sowed 39 days, 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride are respectively flushed into the area C with water according to the use amounts of 10 kg/mu and 5 kg/mu for the second time, and bacterial manure is flushed into the area C with water according to the use amount of 10 kg/mu after half an hour;
step seven: and (3) after the sorghum is sowed for 90 days, flushing 30 mass percent of sodium dodecyl benzene sulfonate and 50 mass percent of hydrolyzed polymaleic anhydride into the area C with water according to the use amounts of 10 kg/mu and 5 kg/mu for the third time, and flushing bacterial manure into the area C with water according to the use amount of 10 kg/mu after half an hour.
The experimental plot D is improved according to the following steps:
step , soaking the region D in clear water for 120 days;
step two: pulping the soaked area D by a paddy field pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying bacterial manure into the area D according to the dosage of 10 kg/mu 30 days before sorghum seeding, and seeding the sorghum 30 days later;
step five, after the sorghum is sowed for 15 days, the bacterial manure is flushed into the area D with water according to the dosage of 10 kg/mu at the th time;
step six: after sorghum is sowed for 39 days, the bacterial manure is flushed into the area D with water according to the using amount of 10 kg/mu for the second time;
step seven: and (3) after the sorghum is sowed for 90 days, and the bacterial manure is flushed into the area D with water according to the using amount of 10 kg/mu for the third time.
The other field management modes of the area A, the area B, the area C and the area D of the experimental area are the same.
The results of the regional sorghum survey for the different experimental areas are shown in table 7.
TABLE 7 sorghum survey results
As can be seen from the data in table 7, compared with the sorghum planted in the severe soda saline-alkali soil improved by the method, the yield of the sorghum is increased by at least 54%, the yield can reach the level of medium yield, the thousand-grain weight of the sorghum is increased by at least 24%, and the quality of the sorghum is correspondingly improved; meanwhile, the pH value and the salt content of the soil are obviously reduced, the hardening condition is obviously improved, and the soil is restored to a state suitable for normal growth of crops.
And (4) experimental conclusion: according to the experimental data of the embodiments 1-7, the method provided by the invention can be used for improving the severe soda saline-alkali soil, so that the pH value and the salt content of the soil can be effectively reduced, the hardening condition is obviously improved, and the soil is more suitable for plant growth; the improvement method is simple and easy to implement, good in effect and quick in effect, and the soil can be restored to a state suitable for normal growth of crops in the current year.
The foregoing description is intended to be illustrative rather than limiting, and it will be appreciated by those skilled in the art that various modifications, changes, and equivalents may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (7)
1, A method for improving severe soda saline-alkali soil, which is characterized by comprising the following steps:
step , diluting concentrated sulfuric acid with water, and then flushing the diluted concentrated sulfuric acid and hydrolyzed polymaleic anhydride with water into the severe soda saline-alkali soil for 1-120 days;
step two: pulping the soaked severe soda saline-alkali soil by using a pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying bacterial manure to severe soda saline-alkali soil 1-30 days before planting;
step five, 1-15 days after planting, the hydrolyzed polymaleic anhydride and bacterial manure are flushed into the severe soda saline-alkali soil along with water at times;
step six: after 16-39 days of planting, flushing the hydrolyzed polymaleic anhydride and bacterial manure into the severe soda saline-alkali soil along with water for the second time;
step seven: and (4) after 40-90 days of planting, flushing the hydrolyzed polymaleic anhydride and bacterial manure into the severe soda saline-alkali soil with water for the third time.
2. method for improving severe soda saline-alkali soil according to claim 1, characterized in that the method comprises the following steps:
step , diluting concentrated sulfuric acid with water, then flushing the diluted concentrated sulfuric acid and hydrolyzed polymaleic anhydride with water into the severe soda saline-alkali soil, and soaking for 7-20 days;
step two: pulping the soaked severe soda saline-alkali soil by using a pulping machine;
step three: standing after pulping, and discharging water after water and soil separation;
step four: applying the bacterial manure into the severe soda saline-alkali soil 12 days before planting, and planting 12 days after planting;
step five, 3 days after planting, times of flushing the hydrolyzed polymaleic anhydride and bacterial manure into the severe soda saline-alkali soil with water;
step six: 30 days after planting, the hydrolyzed polymaleic anhydride and bacterial manure are flushed into the severe soda saline-alkali soil along with water for the second time;
step seven: and (5) 60 days after planting, flushing the hydrolyzed polymaleic anhydride and bacterial manure into the severe soda saline-alkali soil with water for the third time.
3. The method for improving severe soda saline-alkali soil according to any one of claims 1 to 2 and , wherein the mass percentage of the concentrated sulfuric acid in the step is 98% and the dosage is 5-200 kg/mu, and the mass percentage of the hydrolyzed polymaleic anhydride is 50% and the dosage is 1-50 kg/mu.
4. The methods for improving severe soda saline-alkali soil according to any one of claims 1 to 2 to , wherein the mass percent of the hydrolyzed polymaleic anhydride in the fourth step to the seventh step is 50%, the dosage of the hydrolyzed polymaleic anhydride is 1 to 5 kg/mu, and the dosage of the bacterial manure is 1 to 10 kg/mu.
5. The method for improving severe soda saline-alkali soil according to claim 4, wherein the bacterial manure consists of Bacillus subtilis and Paenibacillus mucilaginosus, and the effective viable count is more than or equal to 2.0 hundred million/mL.
6. The method for improving severe soda saline-alkali soil according to any one of claims 1 to 2 to , wherein the step five to the step seven of flushing the hydrolyzed polymaleic anhydride and bacterial manure into the severe soda saline-alkali soil with water comprises two steps:
step A: the hydrolyzed polymaleic anhydride is flushed into the severe soda saline-alkali soil along with water;
and B: and after half an hour, the bacterial manure is flushed into the severe soda saline-alkali soil along with water.
7. The method for improving the severe soda saline-alkali soil according to claim 6, wherein the step and the step five to the step seven further comprise that sodium dodecyl benzene sulfonate and the hydrolyzed polymaleic anhydride are simultaneously flushed into the severe soda saline-alkali soil along with water, and the mass percentage of the sodium dodecyl benzene sulfonate is 30 percent and the dosage is 0.5 to 10 kg/mu.
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| CN103109615A (en) * | 2013-03-05 | 2013-05-22 | 北京天食和谷农业科技有限公司 | Improvement method for saline-alkali soil |
| CN105144893A (en) * | 2015-09-30 | 2015-12-16 | 中国科学院东北地理与农业生态研究所 | Irrigation and drainage method for improving soda alkali-saline paddy field in field steeping period |
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| CN1424379A (en) * | 2001-12-12 | 2003-06-18 | 刘广飞 | Saline-alkali soil improver |
| CN102585068A (en) * | 2011-01-18 | 2012-07-18 | 孟永 | Preparation method of hydrolyzed polymaleic anhydride |
| CN103069944A (en) * | 2013-01-04 | 2013-05-01 | 中国科学院东北地理与农业生态研究所 | Method for quickly modifying severe soda alkali-saline soil |
| CN103109615A (en) * | 2013-03-05 | 2013-05-22 | 北京天食和谷农业科技有限公司 | Improvement method for saline-alkali soil |
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