Soil conditioner for improving fertility of saline-alkali soil

Abstract

The invention relates to the technical field of soil conditioners, and provides a soil conditioner for improving fertility of saline-alkali soil, the soil conditioner comprises the following raw materials by weight: 10-15 parts of an organosilicon fertilizer, 2-5 parts of humic acid, 20-25 parts of modified sepiolite, 5-10 parts of potassium feldspar, 1-2 parts of a dispersant, and 80-90 parts of water, the modified sepiolite is obtained by modifying sepiolite with a modifier, and the modified sepiolite is obtained by modifying sepiolite with a modifier. The modifier is prepared from 3-carboxyl methyl amino methyl-4-hydroxybenzoic acid and / or N-(carboxymethyl) maleamic acid. According to the technical scheme, the problem that the improvement effect of a soil conditioner on saline-alkali soil in the prior art is not ideal is solved.

Description

Technical Field

[0001] The invention relates to the technical field of soil conditioners, and in particular to a soil conditioner for improving the fertility of saline-alkali land. Background Art

[0002] Soil is an important resource for agricultural production. Soil salinization can cause changes in the physical structure of the soil and reduce nutrient elements. Soil salinization is a type of desertification, and the reduction in soil productivity caused by it has become a limiting factor for sustainable agricultural development.

[0003] The management of saline-alkali land mainly adopts water conservancy project improvement, chemical improvement, agricultural technology improvement and other methods. Water conservancy project improvement is not suitable for all types of saline-alkali land, and over-reliance on water conservancy project improvement of saline-alkali land may also lead to the loss of soil nutrients; agricultural technology improvement requires a large amount of capital investment, and the method is complicated to implement, and technical support is required during the process; chemical improvement is to add soil conditioners to improve the fertility of saline-alkali land. The method of adding soil conditioners is highly flexible, simple to implement, and low in cost, but the effect of improving the fertility of saline-alkali land is not good, so it is necessary to develop a soil conditioner that can effectively improve the fertility of saline-alkali land. Summary of the invention

[0004] The present invention provides a soil conditioner for improving the fertility of saline-alkali land, which solves the problem that the soil conditioner in the related art has an unsatisfactory effect on improving saline-alkali land.

[0005] The technical solution of the present invention is as follows: The invention provides a soil conditioner for improving the fertility of saline-alkali land, comprising the following raw materials in parts by weight: 10-15 parts of organosilicon fertilizer, 2-5 parts of humic acid, 20-25 parts of modified sepiolite, 5-10 parts of potassium feldspar, 1-2 parts of dispersant, and 80-90 parts of water, wherein the modified sepiolite is obtained by modifying sepiolite with a modifier, and the modifier comprises 3-carboxymethylaminomethyl-4-hydroxybenzoic acid and / or N-(carboxymethyl)maleamic acid.

[0006] As a further technical solution, it is characterized in that the added amount of the modifier is 3% to 4% of the mass of the sepiolite.

[0007] As a further technical solution, when the modifier is composed of 3-carboxymethylaminomethyl-4-hydroxybenzoic acid and N-(carboxymethyl)maleamic acid, the mass ratio of the 3-carboxymethylaminomethyl-4-hydroxybenzoic acid to N-(carboxymethyl)maleamic acid is 1:2~4.

[0008] In the soil, saline-alkali land and heavy metal pollution often coexist at the same time, and both of them have an impact on the environment and the ecosystem. Therefore, soil conditioners not only need to improve saline-alkali soil but also need to have a treatment effect on heavy metal pollution. Sepiolite not only has the effect of regulating the pH of the soil, but also can adsorb heavy metals. The present invention finds that when the mass ratio of 3-carboxymethylaminomethyl-4-hydroxybenzoic acid and N-(carboxymethyl)maleamic acid is limited to 1:2-4, the adsorption effect of sepiolite on heavy metals can be better improved, so that the soil has a higher water retention capacity, and plants can grow and develop normally.

[0009] As a further technical solution, the mass ratio of the 3-carboxymethylaminomethyl-4-hydroxybenzoic acid to N-(carboxymethyl)maleamic acid is 1:3.

[0010] As a further technical solution, the preparation method of the modified sepiolite is: adding sepiolite and a modifier into a solution for modification to obtain the modified sepiolite.

[0011] As a further technical solution, the preparation method of the modified sepiolite is: add sepiolite and 3-carboxymethylaminomethyl-4-hydroxybenzoic acid to a solvent for a first modification, and then add N-(carboxymethyl)maleamic acid for a second modification to obtain the modified sepiolite.

[0012] As a further technical solution, the solvent is anhydrous ethanol.

[0013] As a further technical solution, the particle size of the sepiolite is 200-600 mesh.

[0014] As a further technical solution, the particle size of the potassium feldspar is 200~600 mesh.

[0015] As a further technical solution, the dispersant is one or both of fatty alcohol polyoxyethylene ether and fatty acid polyethylene glycol ester.

[0016] As a further technical solution, the organosilicon fertilizer contains N, P 2 O 5 , K 2 O, Si, Ca.

[0017] The invention also provides a method for preparing a soil conditioner for improving the fertility of saline-alkali land. The soil conditioner is obtained by uniformly mixing the raw materials.

[0018] The working principle and beneficial effects of the present invention are: The soil conditioner in the present invention comprises organosilicon fertilizer and humic acid. Humic acid can adjust soil pH, improve soil physical and chemical properties with high dispersion and poor structure, promote the formation of soil aggregates, promote the growth and development of plant roots, and reduce soil salt content. The soil conditioner also contains N, P, K, S and trace elements, and can improve soil structure and increase soil fertility together with organosilicon fertilizer. Sepiolite has good dispersibility, can adjust soil pH, and has certain adsorption performance for heavy metals. After the sepiolite is modified by 3-carboxymethylaminomethyl-4-hydroxybenzoic acid and / or N-(carboxymethyl)maleamic acid, the adsorption of heavy metals by the sepiolite can be further improved. At the same time, the soil has high soil water retention and improves soil activity, thereby solving the problem that the soil conditioner has an unsatisfactory improvement effect on saline-alkali land. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] In the following embodiments and comparative examples: The effective substances in organic silicon fertilizer are: N 20%, P 2 O 5 10%, K 2 O 20%, Si 3%, Ca 0.5%; Humic acid: item number 001, manufacturer: Jinan Yunze Chemical Co., Ltd.

[0021] Example 1 A method for preparing a soil conditioner for improving the fertility of saline-alkali land comprises the following steps: A soil conditioner is obtained by uniformly mixing 10 parts of organosilicon fertilizer, 2 parts of humic acid, 20 parts of modified sepiolite, 5 parts of potassium feldspar (particle size 200 meshes), 1 part of fatty alcohol polyoxyethylene ether and 80 parts of water.

[0022] The preparation method of the modified sepiolite comprises the following steps: 1.2 g of 3-carboxymethylaminomethyl-4-hydroxybenzoic acid was added to 300 mL of anhydrous ethanol, and then 40 g of sepiolite (particle size 200 mesh) was added and mixed evenly. The mixture was modified at 55° C. for 2 h and dried to obtain modified sepiolite.

[0023] Example 2 A method for preparing a soil conditioner for improving the fertility of saline-alkali land comprises the following steps: A soil conditioner is obtained by uniformly mixing 12 parts of organosilicon fertilizer, 4 parts of humic acid, 22 parts of modified sepiolite, 7 parts of potassium feldspar (particle size 400 mesh), 1.5 parts of fatty alcohol polyoxyethylene ether and 85 parts of water.

[0024] The preparation method of the modified sepiolite comprises the following steps: 1.4 g of 3-carboxymethylaminomethyl-4-hydroxybenzoic acid was added to 300 mL of anhydrous ethanol, and then 40 g of sepiolite (particle size 400 mesh) was added and mixed evenly. The mixture was modified at 50° C. for 3 h and dried to obtain modified sepiolite.

[0025] Example 3 A method for preparing a soil conditioner for improving the fertility of saline-alkali land comprises the following steps: A soil conditioner is obtained by uniformly mixing 15 parts of organosilicon fertilizer, 5 parts of humic acid, 25 parts of modified sepiolite, 10 parts of potassium feldspar (particle size 600 mesh), 2 parts of fatty alcohol polyoxyethylene ether and 90 parts of water.

[0026] The preparation method of the modified sepiolite comprises the following steps: 1.6 g of 3-carboxymethylaminomethyl-4-hydroxybenzoic acid was added to 300 mL of anhydrous ethanol, and then 40 g of sepiolite (particle size 600 mesh) was added and mixed evenly. The mixture was modified at 60° C. for 1 h and dried to obtain modified sepiolite.

[0027] Example 4 The only difference between this embodiment and embodiment 1 is that 3-carboxymethylaminomethyl-4-hydroxybenzoic acid is replaced by an equal amount of N-(carboxymethyl)maleamic acid.

[0028] Example 5 The present embodiment is different from the embodiment 1 only in that 3-carboxymethylaminomethyl-4-hydroxybenzoic acid is replaced with 3-carboxymethylaminomethyl-4-hydroxybenzoic acid and N-(carboxymethyl)maleamic acid in a mass ratio of 1:1.

[0029] Example 6 The difference between this embodiment and embodiment 1 is that the preparation method of the modified sepiolite is as follows: 0.6 g of 3-carboxymethylaminomethyl-4-hydroxybenzoic acid is added to 300 mL of anhydrous ethanol, and then 40 g of sepiolite (particle size 200 mesh) is added and mixed evenly, and after modification at 55° C. for 1 hour, 0.6 g of N-(carboxymethyl)maleamic acid is added, and after modification at 55° C. for 1 hour, the modified sepiolite is obtained.

[0030] Example 7 The difference between this embodiment and embodiment 1 is only the preparation method of the modified sepiolite. The preparation method of the modified sepiolite in this embodiment is as follows: 0.6 g of N-(carboxymethyl)maleamic acid is added to 300 mL of anhydrous ethanol, and then 40 g of sepiolite (particle size 200 mesh) is added and mixed evenly, and after modification at 55° C. for 1 hour, 0.6 g of 3-carboxymethylaminomethyl-4-hydroxybenzoic acid is added, and after modification at 55° C. for 1 hour, the modified sepiolite is obtained.

[0031] Example 8 The only difference between this embodiment and embodiment 6 is that the amount of 3-carboxymethylaminomethyl-4-hydroxybenzoic acid is 0.8 g and the amount of N-(carboxymethyl)maleamic acid is 0.4 g.

[0032] Example 9 The only difference between this embodiment and embodiment 6 is that the amount of 3-carboxymethylaminomethyl-4-hydroxybenzoic acid is 0.4 g and the amount of N-(carboxymethyl)maleamic acid is 0.8 g.

[0033] Example 10 The only difference between this embodiment and embodiment 6 is that the amount of 3-carboxymethylaminomethyl-4-hydroxybenzoic acid is 0.3 g and the amount of N-(carboxymethyl)maleamic acid is 0.9 g.

[0034] Embodiment 11 The only difference between this embodiment and embodiment 6 is that the amount of 3-carboxymethylaminomethyl-4-hydroxybenzoic acid is 0.24 g and the amount of N-(carboxymethyl)maleamic acid is 0.96 g.

[0035] Comparative Example 1 A method for preparing a soil conditioner for improving the fertility of saline-alkali land comprises the following steps: A soil conditioner is obtained by uniformly mixing 15 parts of organosilicon fertilizer, 5 parts of humic acid, 20 parts of sepiolite (particle size 200 mesh), 5 parts of potassium feldspar (particle size 200 mesh), 1 part of fatty alcohol polyoxyethylene ether and 80 parts of water.

[0036] Test example The performance of the soil conditioner in Examples 1 to 11 and Comparative Example 1 was measured (1) Determination method of heavy metal removal rate: weigh 100g of saline-alkali soil into a 1L beaker, add 500mL of deionized water and 5g of soil conditioner (minus the water in the soil conditioner), stir and treat for 7 days, and then magnetically separate the conditioner. The contaminated soil before and after treatment is dried at 100℃, digested, fixed, and filtered. The heavy metal content of the saline-alkali soil before and after treatment is determined by an atomic absorption spectrophotometer, and the heavy metal removal rate is calculated. The calculation formula is as follows; Removal rate = (H0-H1) / H0×100%; Where: H0 is the content of heavy metals in the soil before treatment; H1 is the content of heavy metals in the soil after treatment.

[0037] (2) Method for determining soil water holding capacity: Apply soil conditioner to saline-alkali soil (application rate is 2 kg / mu), take samples after 60 days to test soil water holding capacity, and use water as a blank control; The measurement results are shown in Table 1.

[0038] Table 1 Performance test results of soil conditioners in Examples 1 to 11, Comparative Example 1, and blank control

[0039] Compared with Example 1, the sepiolite in Comparative Example 1 was not modified. As a result, the soil water holding capacity and heavy metal removal rate in Example 1 were higher than those in Example 1, indicating that modifying the sepiolite with 3-carboxymethylaminomethyl-4-hydroxybenzoic acid can increase the water holding capacity of the soil and reduce the heavy metal content.

[0040] Compared with Example 1, Example 4 uses N-(carboxymethyl)maleamic acid to modify the sepiolite, and the soil moisture content in Example 4 is higher than that in Example 1 and Example 4. Example 5 uses 3-carboxymethylaminomethyl-4-hydroxybenzoic acid and N-(carboxymethyl)maleamic acid to modify the sepiolite together. As a result, the soil moisture content and heavy metal removal rate in Example 5 are higher than those in Example 1 and Example 4, indicating that the use of 3-carboxymethylaminomethyl-4-hydroxybenzoic acid and N-(carboxymethyl)maleamic acid to modify the sepiolite together can further increase the soil moisture content and reduce the heavy metal content.

[0041] The soil moisture content and heavy metal removal rate in Example 6 are higher than those in Example 5 and Example 7, indicating that modification with 3-carboxymethylaminomethyl-4-hydroxybenzoic acid and then with N-(carboxymethyl)maleamic acid can further increase the soil moisture content and reduce the heavy metal content.

[0042] The soil moisture content and heavy metal removal rate in Examples 9 to 11 are higher than those in Examples 8 and 6, indicating that when the mass ratio of 3-carboxymethylaminomethyl-4-hydroxybenzoic acid to N-(carboxymethyl)maleamic acid is 1:2 to 4, the soil moisture content can be further increased and the heavy metal content in the soil can be reduced.

[0043] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A soil conditioner for improving the fertility of saline-alkali land, It is characterized in that The raw materials include the following components in parts by weight: 10-15 parts of organosilicon fertilizer, 2-5 parts of humic acid, 20-25 parts of modified sepiolite, 5-10 parts of potassium feldspar, 1-2 parts of dispersant, and 80-90 parts of water. The modified sepiolite is obtained by modifying sepiolite with a modifier, and the modifier includes 3-carboxymethylaminomethyl-4-hydroxybenzoic acid and / or N-(carboxymethyl)maleamic acid.

2. A soil conditioner for improving fertility of saline-alkali land according to claim 1, It is characterized in that The amount of the modifier added is 3% to 4% of the mass of the sepiolite.

3. A soil conditioner for improving fertility of saline-alkali land according to claim 1, It is characterized in that When the modifier consists of 3-carboxymethylaminomethyl-4-hydroxybenzoic acid and N-(carboxymethyl)maleamic acid, the mass ratio of the 3-carboxymethylaminomethyl-4-hydroxybenzoic acid to the N-(carboxymethyl)maleamic acid is 1:2-4.

4. A soil conditioner for improving fertility of saline-alkali land according to claim 1, It is characterized in that The preparation method of the modified sepiolite is as follows: sepiolite and a modifier are added into a solution for modification to obtain the modified sepiolite.

5. A soil conditioner for improving fertility of saline-alkali land according to claim 4, It is characterized in that The preparation method of the modified sepiolite is as follows: sepiolite and 3-carboxymethylaminomethyl-4-hydroxybenzoic acid are added to a solvent for a first modification, and then N-(carboxymethyl)maleamic acid is added for a second modification to obtain the modified sepiolite.

6. A soil conditioner for improving fertility of saline-alkali land according to claim 1, It is characterized in that The particle size of the sepiolite is 200-600 meshes.

7. A soil conditioner for improving fertility of saline-alkali land according to claim 1, It is characterized in that The particle size of the potassium feldspar is 200-600 meshes.

8. A soil conditioner for improving fertility of saline-alkali land according to claim 1, It is characterized in that The dispersant is one or both of fatty alcohol polyoxyethylene ether and fatty acid polyethylene glycol ester.

9. A soil conditioner for improving fertility of saline-alkali land according to claim 1, It is characterized in that The organosilicon fertilizer contains N, P 2 O 5 , K 2 O, Si, Ca.

10. The method for preparing a soil conditioner for improving fertility of saline-alkali land according to claim 1, It is characterized in that After the raw materials are mixed evenly, a soil conditioner is obtained.

Images