Method for shallow-water, temperature-raising and water-saving irrigation of paddy fields in cold area in early original field period

Abstract

The invention relates to a method for shallow-water, temperature-raising and water-saving irrigation of paddy fields in cold areas in an early original field period, which is applicable to paddy fields in the northeast and north of China. The method is to carry out shallow irrigation at nightfall every day from a seedling stage after the rice seedlings are transplanted to a tillering stage. The key point of the shallow-water and temperature-raising irrigation method lies in the control over the depth of water layers during daytime and at night, namely the water layer is kept as thin as possible during daytime for absorbing solar radiation, raising temperature of the soil and promoting rooting of the rice seedlings and is kept at a proper depth at night to prevent the loss of ground surface heat. Experiments show that: the paddy fields adopting shallow-water and temperature-raising irrigation save about 36.72 to 46.38 percent of water than paddy fields irrigated by the conventional method; and at the same time, the rice adopts shallow-water and temperature-raising irrigation has bigger number of plants per hole, number of ears per hole, number of effective ears per plant and numberof grain per ear than rice adopting conventional irrigation, and thus, the yield of the rice is high. Field experiments show that the shallow-water and temperature-raising irrigation method can increase yield by 8.25 to 13.15 percent compared with the conventional irrigation method.

Description

technical field [0001] The invention belongs to the technical field of agricultural cultivation, and relates to a method for shallow water temperature-increasing and water-saving irrigation in the early Honda stage of rice fields in cold regions. technical background [0002] The main limiting factor for agriculture in high latitudes is thermal conditions. Due to the high geographical latitude, short frost-free period, and generally low annual accumulated temperature, it belongs to the one-crop area of ​​warm and cool crops in terms of agricultural regionalization, which is suitable for the growth of corn, soybeans, spring wheat, rice and other grains that are cropped once a year. Because the frost-free period is relatively short, the growth period of crops is also relatively short, and low temperature chilling damage is prone to occur in spring. In order to ensure sufficient growth time for rice, rice cultivation in high-latitude areas generally adopts the method of raisin...

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Problems solved by technology

[0004] Aiming at the problems of slow soil temperature increase and large surface temperature difference between day and night in spring paddy fields in high latitude areas, the present invention proposes a method for early shallow water temperature-increasing and water-saving irrigation in rice fields in cold regions.

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