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A kind of organic nitrogen fertilizer that passivates soil cadmium activity and using method thereof

An organic and soil technology, applied in the field of soil fertilizer, can solve the problems of easy damage to the soil microbial environment, can not be used as fertilizer, can not be used as soil fertilizer, etc., to solve environmental pollution, good resource utilization of food waste, and sufficient raw materials cheap effect

Active Publication Date: 2021-02-02
JIANGNAN UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

The above-mentioned published patents use plant straw or livestock and poultry manure. These two raw materials may contain cadmium themselves, which not only cannot reduce but also increase soil cadmium content.
At the same time, the existing public organic fertilizers that passivate soil cadmium only reduce the use of chemical fertilizers, and cannot replace chemical fertilizers. There are also passivators dedicated to removing soil cadmium, which still cannot be used as chemical fertilizers.
[0005] Furthermore, in the prior art, microorganisms or microbial fermentation liquids are used as passivators to remove cadmium in the soil, but this method is easy to destroy the soil microbial environment and then destroy the balance of the soil itself, and the cost of raw materials is high. Poor applicability and cannot be used as soil fertilizer

Method used

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  • A kind of organic nitrogen fertilizer that passivates soil cadmium activity and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Use neutral protease to partially hydrolyze the protein of rice dregs to obtain a compound with a nitrogen solubility index of 30% and a nitrogen content of 13%. The pH of the compound is 7.45. After spray drying, the powder is passed through a 100-mesh sieve to obtain a passivated soil with cadmium activity functional organic nitrogen fertilizer. The cadmium content of the potting experiment soil was 3mg / kg, and the potting area was 0.144㎡. The application amount of functional nitrogen fertilizer is converted according to the application amount of inorganic nitrogen for rice growth (N, 10kg / mu), that is, the application amount of 77kg / mu, 16.6g / pot. Apply three times, apply 60% one week before transplanting the seedlings, turn the soil, rake evenly, and irrigate, and the water submerges the soil to a height of 3-5cm; apply 25% at the tillering stage; apply 15% at the heading stage, irrigate, and submerge the soil at a height of 3-5cm , rice yield per pot and brown ric...

Embodiment 2

[0033] Use neutral protease to partially hydrolyze the protein of rice dregs to obtain a compound with a nitrogen solubility index of 10% and a nitrogen content of 13%. The pH of the compound is 6.01. After spray drying, the powder is passed through a 100-mesh sieve to obtain a passivated soil with cadmium activity functional organic nitrogen fertilizer. The cadmium content of the potting experiment soil was 3mg / kg, and the potting area was 0.144㎡. The application amount of functional nitrogen fertilizer is converted according to the application amount of inorganic nitrogen for rice growth (N, 10kg / mu), that is, the application amount of 77kg / mu, 16.6g / pot. Apply three times, apply 60% one week before transplanting the seedlings, turn the soil, rake evenly, and irrigate, and the water submerges the soil to a height of 3-5cm; apply 25% at the tillering stage; apply 15% at the heading stage, irrigate, and submerge the soil at a height of 3-5cm , rice yield per pot and brown ric...

Embodiment 3

[0035]The protein of rice dregs is partially hydrolyzed with neutral protease to obtain a compound with a nitrogen solubility index of 30% and a nitrogen content of 9%. The compound has a pH of 7.35 and is passed through a 100-mesh sieve to obtain a functional organic nitrogen fertilizer that inactivates soil cadmium activity. The cadmium content of the potting experiment soil was 3mg / kg, and the potting area was 0.144㎡. The application amount of functional nitrogen fertilizer is converted according to the application amount of inorganic nitrogen for rice growth (N, 10kg / mu), that is, the application amount is 111kg / mu, 24g / pot. Apply three times, apply 60% one week before transplanting the seedlings, turn the soil, rake evenly, and irrigate, and the water submerges the soil to a height of 3-5cm; apply 25% at the tillering stage; apply 15% at the heading stage, irrigate, and submerge the soil at a height of 3-5cm , rice yield per pot and brown rice cadmium content in pot exper...

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Abstract

The invention discloses an organic nitrogen fertilizer for passivating soil cadmium activity and a method for using the same. The organic nitrogen fertilizer of the invention uses rice dregs as a raw material, and is obtained through enzymatic hydrolysis and drying. It has a good effect of catalyzing soil cadmium, reduces the absorption characteristics of rice to cadmium, solves the problem of heavy metal cadmium pollution of rice and environmental pollution caused by long-term use of chemical fertilizers, and can also be used as organic nitrogen fertilizer, which can replace inorganic nitrogen fertilizer application, and is an environmentally friendly fertilizer. .

Description

technical field [0001] The invention relates to the technical field of soil fertilizers, in particular to an organic nitrogen fertilizer for passivating soil cadmium activity and its application method. Background technique [0002] At present, my country's total cultivated land area is about 120 million hm 2 , of which the cultivated land polluted by cadmium is about 20,000 hm 2 , and there is a gradually increasing trend. Compared with other crops, rice is more likely to accumulate cadmium. Rice is one of the most important food crops in the world. Nearly half of the world's population uses rice as a staple food. Therefore, it has also become the largest source of cadmium absorption for humans. After a long period of time, cadmium accumulates in the human body and gradually produces toxic effects. [0003] In recent years, there are three main methods of repairing cadmium pollution: 1) The physical methods of soil replacement and leaching. Secondary pollution; 2) Phyto...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05F5/00A01C21/00
CPCA01C21/005C05F5/002C05F17/20Y02A40/20
Inventor 陈正行尹仁文李娟王韧于秋生
Owner JIANGNAN UNIV
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