Method for irrigating rice by appropriately utilizing rainwater

Abstract

The invention relates to a method for irrigating rice, which is a comprehensive technology for the water and fertilizer regulation of a rice field wetland system in rainy areas in the southern of China. Based on the agricultural irrigation and rainfall coordination idea, field water and fertilizer conversion and utilization are used as a system to be considered, rice is subjected to appropriate drought stress before irrigation under the condition that the yield of crops is not reduced, the rice is subjected to appropriate waterlogging stress when suffering from large rainfall, and the droughtstress and the waterlogging stress alternately happen, thus, the water and fertilizer contents of a rice field are scientifically adjusted, multiple arms of ensuring that the yield of regional rice is not reduced, increasing the utilization ratio of rainwater, reducing the water consumption for irrigation, reducing flood disasters, reducing water lifting energy consumption of a pump station, increasing the utilization efficiency of fertilizer and improving the regional water environment are achieved; and the comprehensive benefit of the rice field wetland system is exerted to the maximum extent.

Description

technical field [0001] The invention relates to a rice irrigation method. Background technique [0002] At present, rice water-saving irrigation technologies can be divided into the following 4 categories, most of which are summaries of production experience, resulting in inconsistent technical indicators of rice water-saving irrigation. The main difference is the control of the upper and lower limits of field moisture. [0003] (1) "Shallow, wet, and sun" mode: This mode is the most widely used in my country, mainly including rice thin dew irrigation popularized in Zhejiang, "thin, shallow, wet, sun" irrigation widely promoted in Guangxi Zhuang Autonomous Region, northern China Promoted "shallow wet" irrigation, etc. Its main principle is to keep the field surface in a state of shallow water and wet alternately for a long time according to the water demand characteristics and requirements of each growth stage of rice, and dry the field in time to create a good environment f...

AI Technical Summary

Problems solved by technology

[0008] ①Existing technology pays too much attention to irrigation and fails to deal with the relationship between rainwater utilization and irrigation

[0009] The origin of agricultural irrigation is the irrigation after the "rainfall" is insufficient, that is, the irrigation is carried out according to the needs of the crops after the rainfall is fully utilized. Not enough attention has been paid to the relationship between rainfall utilization, especially how to make full use of rainfall, and the trade-off relationship between irrigation and rainfall has also been considered, but it is far from enough

This is especially important for rice irrigation in rainy areas in the south. Practice has proved that in the high rainfall areas along the southeast coast, under the condition of rational use of rainfall, rice is seldom irrigated in wet years, but the amount of water irrigated by existing water-saving irrigation technologies is still relatively large

[0010] ② Field water control indicators are mostly based on experience, not scientific, and are still related to the traditional irrigation concept, that is, focusing on irrigation. The core of water saving work is still focused on reducing leakage

[0013] ③ Neglecting the consideration of paddy field wetland functions, and lacking consideration of rice water-saving irrigation technology issues from the perspective of regional-scale water circulation and water environment

There are a large number of paddy field wetlands distributed in southern my country, which can hold up rainwater, especially torrential rain and typhoon, thereby reducing flood peaks and delaying the formation of floods, which has an obvious disaster reduction effect. There are few related studies so far.

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