Method for increasing low-temperature resistance of rice seedling stage

Abstract

The invention provides a method for increasing low-temperature resistance of a rice seedling stage and belongs to the technical field of rice planting. The method comprises the following technical steps: 1) irrigating saline water to rice seedlings raised in a seeding tray 2-5 days before the seedlings are transplanted and spraying saline water to rice seedlings raised in fields two days before the seedlings are transplanted; and 2) spraying saline water to the rice seedlings 1-3 days before low temperature comes according to weather forecast. The method for increasing the low temperature resistance of the rice seedling stage, provided by the invention, has the advantages as follows: the design is reasonable; the root activity is enhanced through carrying out sodium chloride pre-treatment on the rice seedlings; the content of partial water in the rice fields is kept; impermeable materials and organic soluble material saccharose are increased; the antioxidase activity is enhanced; the content of scavenge oxygen free radical materials is increased; and the low-temperature resistance of the rice is finally achieved.

Description

technical field [0001] The invention belongs to the technical field of rice planting, and in particular relates to a method for improving low temperature tolerance of rice seedlings. Background technique [0002] Low temperature is one of the important environmental limiting factors affecting plant growth, development and its geographical distribution. As a hygrophyte of subtropical origin, rice will be damaged when the ambient temperature is lower than 10°C due to the lack of adaptability to low temperature, which will seriously affect the normal growth and development of the plant and even cause death. [0003] Paddy rice is one of the main food crops in my country, and it is a major advantage in food production, with a long history of cultivation. Among the four major food crops, rice has the largest cultivation area, the largest total output, and the highest output per unit area. Due to the wide distribution of rice and the large cultivation area, coupled with the grow...

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

2. Cold damage in summer. Northeast China is located on the edge of my country. Due to the high latitude and obvious continental monsoon climate, the weather and climate conditions vary greatly from year to year, and the heat conditions are not very stable. In some years, low temperature weather will be encountered during the rice growth period. , often resulting in a large area of ​​rice yield reduction due to insufficient heat

3. Autumn chilling injury, before and after the cold dew solar term in autumn every year, it is the critical period for late rice heading and flowering in South China and the middle and lower reaches of the Yangtze River. If low temperature damages at this time, it will cause empty shells and grains, resulting in reduced production

Therefore, the loss of water in the aboveground part, and the root system cannot guarantee the supply, is probably one of the important reasons for the low temperature damage of rice seedlings; how to maintain the water in the aboveground part should be one of the ways to regulate the low temperature tolerance of rice seedlings. There are few research reports on this

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