A method to reduce methane emissions from rice fields by altering the rhizosphere oxygen environment

An oxygen environment, paddy field technology, applied in land preparation methods, fertilization methods, agricultural gas emission reduction, etc., can solve complex problems

Active Publication Date: 2020-10-20
碳寻(上海)环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the actual operation of this irrigation mode that adjusts the oxygen environment of the rhizosphere by "using water with oxygen" is relatively complicated, and is often restricted by subjective and objective factors such as labor factors and poor drainage and irrigation.

Method used

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  • A method to reduce methane emissions from rice fields by altering the rhizosphere oxygen environment
  • A method to reduce methane emissions from rice fields by altering the rhizosphere oxygen environment
  • A method to reduce methane emissions from rice fields by altering the rhizosphere oxygen environment

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Embodiment 1

[0020] This embodiment provides a method for reducing methane emissions from paddy fields by changing the rhizosphere oxygen environment, comprising the following steps:

[0021] 1) Seedling field stage: firstly, treat the rice seeds: before soaking the seeds, choose a sunny day to dry the seeds for 1~2 days; Rinse with clean water until the soaking spirit on the surface of the rice seeds is washed clean; then accelerate germination until the root grows one grain and the bud grows half a grain, sow conventional rice at a seeding rate of 7-8kg per mu of seedling field;

[0022] 2) Fertilization: Before transplanting the rice seedlings, the paddy fields were finished, and the base fertilizer was applied, including 12 kg of nitrogen fertilizer (N) and 7.5 kg of phosphorus fertilizer (P 2 o 5 ) and 7.5 kg of potassium fertilizer (K 2 O);

[0023] 3) Rice seedling transplanting: when the rice seedlings are 20-25 days old, transplant the conventional rice seedlings cultivated in ...

Embodiment 2

[0027] This embodiment provides a method for reducing methane emissions from paddy fields by changing the rhizosphere oxygen environment, comprising the following steps:

[0028] 1) Seedling field stage: firstly, treat the rice seeds: before soaking the seeds, choose a sunny day to dry the seeds for 1~2 days; Rinse with clean water until the soaking spirit on the surface of the rice seeds is washed clean; then germinate until the root grows one grain and the bud grows half a grain, sow hybrid rice at a seeding rate of 15-18kg per mu of seedling field

[0029] 2) Fertilization: Before transplanting rice seedlings, the paddy fields were finished, and base fertilizer was applied, including 7.5 kg of nitrogen fertilizer (N), 7.5 kg of phosphorus fertilizer (P 2 o 5 ) and 7.5 kg of potassium fertilizer (K 2 O);

[0030] 3) Transplanting of rice seedlings: transplanting the hybrid rice seedlings cultivated in step 1) in the form of wide rows and narrow spacing when the rice seedl...

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Abstract

The invention belongs to the technical field of rice cultivation, in particular to a method for reducing methane emission in a rice field by altering rhizosphere oxygen environment. The method includes the following steps: (1) during rice seedling stage, conducting seeds soaking, sowing and seedlings growing; (2) applying a fertilizer; (3) transplanting rice seedlings: transplanting the cultivated rice seedlings in step(1) by a wide-row and narrow-distance form; (4) performing oxygen-adding treatment: performing long submerging and oxygen-adding treatment, remaining a 3-5 cm water layer during a rice growing period, totally applying 14.5 kg / mu of calcium peroxide to conduct oxygen adding during a tillering stage and a booting stage; or performing dry and wet irrigation treatment, firstly, irrigating till the rice field water layer is 3-5 cm, then naturally drying; again irrigating till the rice field water layer is 3-5 cm, then naturally drying; repeating the circle. By different oxygen-adding modes, the method has influences on the oxygen environment of field soil and the indexes of soil redox potential, microbial activity and soil respiration intensity, so that the method influences methane production and emission in the rice field and finally achieves the aim that methane emission in the rice field is reduced.

Description

technical field [0001] The invention belongs to the technical field of rice cultivation, and in particular relates to a method for reducing methane emission from paddy fields by changing the rhizosphere oxygen environment. Background technique [0002] Global climate change has become an important issue of common concern to mankind. Methane is an important greenhouse gas, which contributes 15% to global warming. At present, the concentration of methane in the global atmosphere has reached 1.75×10 -3 ml / l, and is increasing at a rate of 0.8% per year. In order to maintain the atmospheric methane concentration at the current level, the IPCC estimates that the annual release of methane into the atmosphere should be reduced by 15% to 20%. my country's rice planting area ranks second in the world, and its output ranks first in the world. The annual methane emission from paddy fields reaches 9.67-12.66 Tg. According to the estimate of the International Rice Research Institute,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A01G22/22A01C1/00A01C21/00A01B79/02
CPCA01B79/02A01C1/00A01C21/005A01G22/22Y02P60/22
Inventor 徐春梅陈丽萍王丹英陈松褚光章秀福
Owner 碳寻(上海)环境科技有限公司
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