Method for passivating heavy metal in rice field and increasing nitrogen immobilization amount

A technology for heavy metals and paddy fields, applied in fertilization methods, rice cultivation, agriculture, etc., can solve the problems of passivation of heavy metals, discount of phosphorus solubilization effect, reduction of cadmium bioavailability, complex repair agent components, etc., and achieve good ecological and environmental benefits And economic benefits, easy operation, and the effect of improving soil environmental quality

Active Publication Date: 2020-11-20
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the composition of the restoration agent in this method is complex, and the water content of the soil needs to be maintained at 25-40% to ensure the restoration effect
CN106591277A discloses a preparation and application method of bacillus with both passivation of heavy metals and phosphorus-solubilizing functions, mainly by expanding the cultivation of bacillus cereus, and then adding biochar to its fermentation liquid and continuing to cultivate to obtain immobilized bacillus, Thereby while reducing the bioavailability of cadmium, increase available phosphorus content in soil,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0020] Example 1

[0021] The experiment was carried out in a rice field in Gejiu City, Yunnan Province

[0022] A method for passivating heavy metals in paddy fields and increasing nitrogen fixation, comprising the steps of:

[0023] (1) Select 1 mu of paddy field and apply base fertilizer, the specific dosage is: nitrogen fertilizer 150kg N / ha, phosphorus fertilizer 60kg P / ha, potassium fertilizer 70kg K / ha. Use a rotary tiller to perform rotary tillage on the rice planting area, the depth of the rotary tillage is 10cm, and then irrigate to keep the water depth at 3cm;

[0024] (2) Transplant rice seedlings to the rice planting area, and keep the field surface water depth as 3cm;

[0025] (3) After the rice seedlings turn green, evenly spray microalgae biofertilizer water to the field water, the amount of microalgae biofertilizer water is 20kg / mu, and the microalgae biofertilizer water is composed of microalgae biofertilizer and water at a ratio of 1:10 The mass ratio is ...

Example Embodiment

[0030] Example 2

[0031] The experiment was carried out in a rice field in Gejiu City, Yunnan Province

[0032] A method for passivating heavy metals in paddy fields and increasing nitrogen fixation, comprising the steps of:

[0033] (1) Select 1 mu of paddy field and apply base fertilizer, the specific dosage is: nitrogen fertilizer 180kg N / ha, phosphorus fertilizer 50kg P / ha, potassium fertilizer 65kg K / ha. Use a rotary tiller to carry out rotary tillage in the rice planting area, the depth of the rotary tillage is 10cm, and then irrigate to keep the water depth at 4cm;

[0034] (2) Transplant rice seedlings to the rice planting area, and keep the field surface water depth as 4cm;

[0035] (3) After the rice seedlings turn green, evenly spray microalgae biofertilizer water in the field water, the amount of microalgae biofertilizer water is 25kg / mu, and the microalgae biofertilizer water is composed of microalgae biofertilizer and water at a ratio of 1:10 The mass ratio i...

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Abstract

The invention relates to a method for passivating heavy metal in the rice field and increasing nitrogen immobilization amount. The method comprises steps as follows: a rice planting area is selected,after base fertilizer is applied, rotary tillage and irrigation are performed, and water depth keeps 3-4 cm; rice seedlings are transplanted in the rice planting area, and the water depth of field surface keeps 3-4 cm; after the seedlings revive, microalgae bio-fertilizer water is sprayed, periphytons in the planting area are observed periodically, the microalgae bio-fertilizer water is added according to the growth vigour condition, and the water depth of field surface keeps 1-2 cm; and after rice harvesting is finished, lower straw is retained, and the periphytons and the straw in the rice field are turned into the ground by rotary tillage. According to the method for passivating heavy metal in the rice field and increasing the nitrogen immobilization amount, periphyton community is constructed by application of microalgae bio-fertilizer, soil pH is changed through photosynthesis and growth and metabolism activity of algae, furthermore, a large quantity of extracellular polymeric substances are secreted, and heavy metal adsorption, passivation capacity and biological nitrogen fixation ability of the periphytons are improved. The method has the characteristics of being low in cost, flexible and easy to operate and is one green eco-technological approach.

Description

technical field [0001] The invention belongs to the field of agriculture and environmental protection, relates to the fields of passivation of heavy metals in paddy fields and improvement of fertility, and in particular relates to a method for passivating heavy metals and increasing the nitrogen fixation capacity of paddy soil. Background technique [0002] Heavy metal pollution is one of the main types of soil pollution. In my country and even the world, due to the discharge of industrial and mining wastes and excessive use of pesticides, heavy metals accumulate in the soil around industrial and mining areas and farmland, and soil health quality declines. Therefore, soil heavy metal pollution remediation technology has attracted much attention. Cadmium (Cd) is a heavy metal element with strong biological toxicity. It has strong chemical activity and long-lasting toxicity in the environment. It is easy to endanger human health through the enrichment of the food chain and ind...

Claims

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Application Information

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IPC IPC(8): A01G22/22A01C21/00C05G3/80C05G5/20
CPCA01G22/22A01C21/005C05G3/80C05G5/20C05D9/00C05F11/00
Inventor 刘俊琢吴永红卢少勇
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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