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Method for promoting soil nitrate reduction by rice root iron plaque

A nitrate and soil technology, which is applied in the field of rice root iron coating to promote soil nitrate reduction, can solve secondary pollution and other problems, and achieve the effect of enhancing microbial nitrate reduction, strong operability, and reducing risks

Active Publication Date: 2019-06-07
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nitrification inhibitors are all chemical substances, which are likely to cause secondary pollution
The technology of using iron film on plant roots to affect nitrate reduction in soil has not been reported yet. To develop an environmentally friendly and operable technology to achieve enhanced nitrate reduction, for the removal of soil nitrate under in situ conditions technology matters

Method used

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  • Method for promoting soil nitrate reduction by rice root iron plaque
  • Method for promoting soil nitrate reduction by rice root iron plaque
  • Method for promoting soil nitrate reduction by rice root iron plaque

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1 A kind of iron film regulates and controls the method for nitrate in soil

[0048] In this study, the soil was collected in the area where nitrogen fertilizer was applied for a long time at the Luancheng Experimental Station of the Chinese Academy of Sciences (37.90°N, 114.67°E, 50m above sea level). The surface soil at 5 different points was collected in the test area. The soil was first air-dried and sieved through a sieve with a pore size of 2mm. The soil has a clay content of 7.3%, a silt content of 79.8% and a sand content of 12.3%. Soil organic matter content is 1.9g kg -1 , pH 7.1, nitrate NO 3 —N is 31.3mg kg -1 and a dissolved organic carbon concentration of 4.1mg kg -1 . Due to the use of fertilizers during the experiment, the concentration of nitrate nitrogen in the soil reached 43-47mgkg -1 . figure 1 It is the figure of the rice blank control (CK) and the rice that has been induced to form iron film (IP).

[0049] (1) The rice seeds of...

Embodiment 2

[0076] Embodiment 2 A kind of method that promotes nitrate reduction in soil

[0077] Transfer rice seedlings in 70mg L -1 The ferrous sulfate solution was induced for 48 hours, and the treated rice seedlings were transplanted into the soil, planted for 4 days, and the soil was flooded with 4 mm of water for 9 days.

Embodiment 3

[0078] Embodiment 3 A kind of method that promotes nitrate reduction in soil

[0079] Transfer rice seedlings in 70mg L -1 The ferrous sulfate solution was induced for 48 hours, and the treated rice seedlings were transplanted into the soil, planted for 5 days, and the soil was flooded with 5 mm of water for 10 days.

[0080] The above results show that by planting rice with iron film induction in the soil, microorganisms related to nitrate reduction and iron redox are enriched in an artificially regulated environment, and the final products are mainly N 2 . These results indicated that iron film regulation treatment is an environmentally friendly technology for nitrate reduction in plant rhizosphere and prevention of nitrate pollution in groundwater.

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Abstract

The invention discloses a method for promoting soil nitrate reduction by a rice root iron plaque. Nitrate reduction can be enhanced by the root iron plaque, the iron oxidation and reduction process iscoupled, and N2 emission is increased. Denitrifying microorganisms in soil and iron oxidation and reduction microorganisms can be enriched, nitrate reduction of crop microorganisms can be enhanced, iron oxidation and reduction are coupled, so that the risk of nitrate leaching loss is reduced, and the method is an environment-friendly method under in-situ conditions and high in practical operability.

Description

technical field [0001] The invention belongs to the technical field of soil improvement, and in particular relates to a method for promoting the reduction of soil nitrate by iron film on rice roots. Background technique [0002] Nitrogen is one of the most important elements lost by leaching in farmland. Nitrogen in soil exists in organic and inorganic forms. Organic nitrogen includes two forms that are easily hydrolyzed and difficult to hydrolyze. Inorganic nitrogen includes free nitrogen, ammonium nitrogen, nitrate nitrogen and nitrite nitrogen. The soil is mostly negatively charged colloids, so it is easy to adsorb a large amount of ammonium nitrogen, but it is difficult to adsorb nitrate nitrogen. Therefore, under the action of rainfall and irrigation, most of the nitrogen in the soil is leached out as soluble nitrate nitrogen. Therefore, under the condition of sufficient water management, controlling the content of nitrate nitrogen in the soil becomes the main factor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01B79/02
Inventor 刘婷余林鹏庞亚星赵雪晴秦树平周顺桂
Owner FUJIAN AGRI & FORESTRY UNIV
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