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Modified phosphate fertilizer for preventing and controlling heavy metal pollution in farmland and application method thereof

A heavy metal and modification technology, applied in fertilization methods, phosphate fertilizers, applications, etc., can solve the problems of difficulty in popularization and application, high application costs, crop yield reduction, etc. The effect of content increase

Active Publication Date: 2018-11-30
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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  • Modified phosphate fertilizer for preventing and controlling heavy metal pollution in farmland and application method thereof
  • Modified phosphate fertilizer for preventing and controlling heavy metal pollution in farmland and application method thereof
  • Modified phosphate fertilizer for preventing and controlling heavy metal pollution in farmland and application method thereof

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 f...

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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PUM

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Abstract

The invention discloses a modified phosphate fertilizer for preventing and controlling heavy metal pollution in a farmland and an application method thereof. The modified phosphate fertilizer is prepared from modified phosphate rock powder, modified calcium magnesium phosphate fertilizer and calcium superphosphate in a certain proportion. The modified phosphate fertilizer is applied to a tillage layer before crop planting to achieve the purpose of passivating heavy metal cadmium in soil and preventing cadmium from transporting to edible parts of crops. The modified phosphate fertilizer can significantly reduce the cadmium content in the edible parts of rice, vegetables and other crops, significantly reduces the effectiveness of the cadmium in soil, and conforms agricultural products produced in the farmland with mild or moderate heavy metal pollution to food safety standards. At the same time, the modified phosphate fertilizer can provide abundant phosphorus nutrition. After applying the modified phosphate fertilizer, no phosphorus fertilizer is needed. The application amount is 30-150 kg / 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 Applications(China)
IPC IPC(8): C05G3/04C05G3/00A01C21/00C05G3/80
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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