Paddy low-temperature cold disaster risk evaluation method

Abstract

The invention relates to disaster preventing technology of crops, and particularly to a Yunnan paddy low-temperature cold disaster risk evaluation method. According to the method of the invention, three risk factors of heading-and-flowering-period low-temperature danger, exposure performance and disaster resistance of the paddy at different places in Yunnan are integrated. Inverse distance weightinterpolation technology, a spatial lattice point model, a natural break point grading method and a picture drawing function are utilized for performing risk analysis and evaluation. The method has animportant guidance meaning for paddy production. Management personnel of agricultural-related department can aim at the paddy low-temperature cold disaster risk conditions at different places for planning and guiding paddy production. In an area with relatively high altitude, invasion of cold air easily occurs and a low temperature frequently occurs; many cold accumulated temperature and low heatlevel exist; the area belongs to a paddy summer low-temperature cold disaster high-risk area; planting of short-grain nonglutinous rice is required and a planting height is properly limited. Different types of excellent paddy seeds with different ripeness are selected from realizing reasonable layout. The paddy seeds in different types are sown in appropriate sowing periods, thereby ensuring a fact that each key developing period is in a local optimal weather period. Furthermore through properly advancing a daddy sowing planting period, the later heading-and-flowering-period low temperature is prevented, thereby drawing-on advantages and avoiding disadvantages. A risk evaluation result has an important guiding meaning to paddy production.

Description

technical field [0001] The invention relates to crop disaster prevention technology, in particular to a risk assessment method for low-temperature chilling damage of rice. Background technique [0002] Rice occupies an important position in the agricultural economy and is the main food crop planted in Yunnan. The planting area is more than 16 million mu, and the total rice output accounts for 40-50% of the total grain output. Stable and increased rice production is the fundamental guarantee for food security, economic prosperity, and rural stability. Low-temperature chilling injury of rice has a serious impact on its growth, development and yield. Establishing a risk assessment method for rice low-temperature chilling injury can provide a technical basis for effective defense against low-temperature chilling injury. Contents of the invention [0003] Aiming at the problem that there is no risk assessment method for low-temperature chilling injury of rice in Yunnan, the pr...

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Problems solved by technology

[0003] Aiming at the problem that there is no risk assessment method for low-temperature chilling injury of rice in Yunnan, the present invention proposes a risk assessment method for low-temperature chilling injury of rice

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