A key cultivation method for improving rice heat tolerance and its application in improving rice heat tolerance

Abstract

The invention discloses a key cultivation method for improving the heat resistance of rice and its application in improving the heat resistance of rice; the cultivation method includes four aspects: variety selection, reasonable close planting, water management and application of plant growth regulators; Among them, heat-resistant and high-yielding rice varieties are the key to the success of the technology. Combined with the characteristics of varieties, reasonable close planting and spatial layout, the population structure can be adjusted to reduce the population canopy temperature; Water management improves water use efficiency, prevents diseases and insect pests caused by high canopy humidity, and reduces canopy temperature; in addition, timely foliar spraying of plant growth regulators can reduce the impact of high temperature on rice pollen grain fertility, pollen germination, and pollen tubes. Elongation and / or damage to grain filling promotes the transshipment of assimilates; the cultivation method of the present invention coordinates elements such as varieties and techniques, solves the problem of rice yield reduction caused by high temperature weather, and ensures high and stable rice yields.

Description

technical field [0001] The invention relates to the field of rice cultivation, in particular to a key cultivation method for improving the heat resistance of rice and the application of the method in improving the heat resistance of rice. Background technique [0002] The reproductive growth period of rice is sensitive to high temperature. The high temperature weather with the highest temperature above 38°C for 2-3 hours on the day of flowering will affect the formation of spikelet fertility; when the high temperature weather with the highest temperature exceeding 38°C lasts for 5-7 days, rice The output will drop by about 10%; if the highest temperature exceeds 40 ℃ and the high temperature lasts for more than 15 days, it will lead to a reduction of 20-30% or even no harvest. Therefore, preventing or reducing the loss of rice heat damage is one of the important measures to ensure food security in my country. [0003] The current countermeasures to deal with the formation o...

AI Technical Summary

Problems solved by technology

Although it can reduce high temperature heat damage to a certain extent, it is still difficult to meet the needs of production under the background of global warming

Because some varieties are more resistant to high temperature in the flowering period, but some varieties are relatively insensitive to high temperature in the filling period, which is difficult for varieties

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