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A modified phosphate fertilizer for preventing and controlling farmland heavy metal pollution and its application method

A heavy metal and modified technology, applied in fertilization methods, phosphate fertilizers, chemical instruments and methods, etc., can solve the problems of crop yield reduction, difficulty in popularization and application, and large dosage.

Active Publication Date: 2021-08-20
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Yet common passivating agent is main component (CN104560046B, CN102174326B, CN103952156A, CN102174325B) with lime and various inorganic minerals, and the application of some passivating agent can change soil physical and chemical properties (as raising soil pH causes nutrients such as soil phosphorus Ineffectiveness, etc.) lead to crop yield reduction in varying degrees, and the general dosage is relatively large (such as reaching more than 500kg per mu), the application cost is high, and it is difficult to popularize and apply
Previous research results such as CN101891530 involve activated calcium-magnesium phosphate fertilizers, which are processed from calcium-magnesium phosphate fertilizers and organic activators, but do not involve passivation of heavy metals; CN1114578 involves raw material-free acid-efficient phosphate fertilizers, which are added after activation by phosphate rock powder Superphosphate or calcium-magnesium phosphate fertilizers are not involved in the passivation of heavy metals

Method used

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  • A modified phosphate fertilizer for preventing and controlling farmland heavy metal pollution and its application method
  • A modified phosphate fertilizer for preventing and controlling farmland heavy metal pollution and its application method
  • A modified phosphate fertilizer for preventing and controlling farmland heavy metal pollution and its application method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A modified phosphate fertilizer for preventing and controlling farmland heavy metal cadmium pollution, which is made of the mass fractions of the following three raw materials:

[0043]

[0044] A method for preparing a modified phosphate fertilizer for preventing and controlling farmland heavy metal cadmium pollution, the steps of which are:

[0045] A. Choose to contain P 2 o 5 More than 18% phosphate rock powder (passed through 80 mesh sieve) with heavy metal cadmium content (calculated as Cd) less than or equal to 0.5mg / kg, add 10% sodium lignosulfonate, mix well, then add phosphate rock powder and lignin Water with 20% of the total mass of sodium sulfonate, fully milled, and dried until the water content is below 15%, to obtain modified phosphate rock powder;

[0046] B. Choose effective P 2 o 5 Calcium magnesium phosphate fertilizer (through 80 mesh sieve) with more than 12% and heavy metal cadmium content (calculated as Cd) less than or equal to 0.2mg / kg...

Embodiment 2～ example 17

[0050] A kind of modified phosphate fertilizer for prevention and control of farmland heavy metal cadmium pollution, it is made by the mass fraction of raw material shown in following table 1:

[0051] Table 1 Raw material ratio of a modified phosphate fertilizer for preventing and controlling farmland heavy metal cadmium pollution

[0052]

[0053]

[0054] Wherein, the preparation of the modified phosphate rock powder and the modified calcium-magnesium phosphate fertilizer was prepared according to the proportions in Table 2 and Table 3 respectively, referring to the method of Example 1.

[0055] Table 2 Raw material ratio of modified phosphate rock powder

[0056] P1 P2 P3 P4 Phosphate rock powder 97 94 89 85 Sodium lignosulfonate 3 6 11 15

[0057] Raw material ratio of table 3 modified calcium magnesium phosphate fertilizer

[0058] C1 C2 C3 C4 calcium magnesium phosphate fertilizer 97 94 89 85 humic a...

Embodiment 18

[0066] Example 18: Application in paddy fields

[0067] During 2016-2017, a field test on the application effect of the products produced in Example 2, Example 5, and Example 10 was carried out in a heavy metal-contaminated paddy field in Shaoguan, Guangdong. Experimental settings No phosphate fertilizer (CK0), application of calcium magnesium phosphate fertilizer (CK1A-30kg / mu, CK1B-50kg / mu, CK1C-100kg / mu, CK1D-150kg / mu), application of Example 2, Example 5 and Example 10 Modified phosphate fertilizer produced (T2A-30kg / mu, T2B-50kg / mu, T2C-100kg / mu, T2D-150kg / mu; T5A-30kg / mu, T5B-50kg / mu, T5C-100kg / mu, T5D ‐150kg / mu; T10A‐30kg / mu, T10B‐50kg / mu, T10C‐100kg / mu, T10D‐150kg / mu), a total of 17 treatments. The area of ​​each plot is 20.0m 2 (4.0m×5.0m), each treatment was repeated three times, and the rice variety Maba Younian was planted.

[0068] Three days before transplanting, according to the experimental design, the corresponding phosphate fertilizers of each treatment we...

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Abstract

The invention discloses a modified phosphate fertilizer for preventing and controlling heavy metal pollution in farmland and a method for using the modified phosphate fertilizer. Applying the plow layer before planting can achieve the purpose of passivating heavy metal cadmium in the soil and blocking the transfer of cadmium to the edible parts of crops. The invention can significantly reduce the cadmium content in edible parts of crops such as rice and vegetables, significantly reduce the effectiveness of cadmium in soil, and can make agricultural products produced in farmlands with mild or moderate heavy metal pollution meet food safety standards. At the same time, the product of the present invention can provide rich phosphorus nutrition, and it is not necessary to apply phosphorus fertilizer after applying the product, and the application rate is 30-150kg / mu, and the cost is low.

Description

technical field [0001] The invention belongs to the field of agricultural environmental protection, and relates to a chemical repair technology for heavy metal-contaminated soil, in particular to a modified phosphate fertilizer for preventing and controlling heavy metal pollution in farmland and a use method thereof. Background technique [0002] In recent years, the threat of soil heavy metal pollution to food safety has attracted much attention, and how to effectively prevent and control it has become a hot spot of global concern. Especially the heavy metal cadmium has high activity in the soil. Many crops such as rice are cadmium-accumulating staple food crops. Soil cadmium pollution poses a great threat to human health. Restoring cadmium-contaminated soil is of great significance to safeguarding people's health. Among many soil heavy metal remediation technologies, the application of passivators to reduce the bioavailability of heavy metals is a relatively economical and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/02C05G3/80C05G3/00A01C21/00
CPCA01C21/00C05B1/02C05G3/00C05G3/80C05B13/02C05B17/00C05F11/02
Inventor 毛小云邵湘晴陈娴姚欢丽陈润成刘梦楠廖宗文
Owner SOUTH CHINA AGRI UNIV
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