Rice seedling anti-low temperature regulator and its preparation method and application

Abstract

The invention discloses an anti-low temperature regulator for rice seedlings. The anti-low temperature regulator for rice seedlings is prepared from a uniconazole solution of which the mass concentration is 19-21mg / L, a KH2PO4 solution of which the mass concentration is 5-7g / L, a salicylic acid solution of which the mass concentration is 99-101mg / L and an abscisic acid solution of which the mass concentration is 9-11mg / L, wherein the volume ratio of the uniconazole solution to the KH2PO4 solution to the salicylic acid solution to the abscisic acid solution is (1-3):(2-4):(0.5-1.5):(0.5-1.5). Practice shows that in combination with a corresponding regulation method, the anti-low temperature regulator for rice seedlings can obviously relieve the low-temperature cold damage of rice in the seedling stage and increase the survival rate of rice seedlings at low temperature.

Description

technical field [0001] The invention belongs to the technical field of agricultural production, and in particular relates to a low-temperature resistance regulator for rice seedlings and a preparation method and application thereof. Background technique [0002] Rice is the main food crop, and the sown area of ​​rice in the world is about 140 million hectares 2 , of which 15 million hm 2 The above rice cropping area is threatened by low temperature. Rice chilling injury has become a worldwide problem, and the annual loss of rice due to low temperature reaches 3 billion to 5 billion kg. Rice is also one of the main food crops in my country. It is planted in a wide area, from 53°27' to 18°90' north latitude. Its sown area, total output and unit yield all rank first among food crops, occupying a very large share in the national economy. Important position. However, almost all areas where rice is produced are subject to varying degrees of chilling damage. The main types of r...

AI Technical Summary

Problems solved by technology

March and April are the seasons for sowing early rice seedlings in the middle and lower reaches of the Yangtze River. At this time, the alternating cold and warm air is frequent, and low temperature and rainy weather often occur, causing early rice seedlings to rot

Fertilizer and water regulation is to reduce the low-temperature chilling damage of rice through reasonable fertilization and water irrigation technology. Among them, irrigation is a more effective way. Generally, the method of night irrigation and daily drainage is adopted. Irrigation and heat preservation in the evening increase a lot of workload for large-scale rice cultivation. It is unrealistic in the northern regions of my country where water resources are becoming increasingly severe, as well as in some southern arid regions or some regions that are seasonally short of water. At the same time, night irrigation and daily drainage are likely to reduce the soil fertility of paddy fields and are not conducive to the growth of rice. Its use value is very limited.

The use of mulching film is beneficial to the short-term low temperature defense of seedlings, but it cannot resist low temperature poisoning in the long run. For example, for early rice direct seeding, or when the low temperature comes during the tillering and filling period, it is not realistic to cover a large area with film. At the same time, mulching film will seriously affect rice. Photosynthesis, seriously damages rice growth and affects rice yield

Foliar spraying of auxin can improve the low temperature tolerance of rice, but there is a problem of high cost. For example, ABA is currently the single anti-cold agent with the best cold resistance effect, but the cost is too high. In addition, auxin may regulate other aspects of rice. aspects of physiological growth, such as inhibiting cell division, promoting premature puberty, etc.

Therefore, up to now, there is no universal, effective and applicable method for reducing the low temperature and chilling damage of rice seedlings.

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