Method of cultivating rice rich in selenium

Abstract

The invention discloses a method of cultivating rice rich in selenium. According to the method, nutrient solution is sprayed at the end of the tillering stage of the rice until the surface of foliage is evenly covered. The nutrient solution is obtained by the following steps: (1) preparation of raw materials: 100 parts of pure water, 1.5 to 2.5 parts of L-selenomethionine, and 0.5 to 1.0 part of hydroxyethyl cellulose; (2) the raw materials prepared in step (1) are mixed and placed in a high-pressure tank, which is pressurized to 4kg / cm2, the pressure is distributed evenly, maintained for 2 to 3 minutes, and then restored to atmospheric pressure in 1 to 3 seconds, and therefore the slurry is obtained. At the temperature of 25 DEG C, by volume percentage of 5 to 10%, liquid strain seeds of maturely-cultivated bacillus subtilis are inoculated into the slurry, which is then placed into a fermentation tank. Sterile air is introduced into the fermentation tank in which the slurry is stirred and fermented. After completion of the fermentation, temperature of the slurry is quickly raised to 70 DEG C and maintained for 0.5 to 1.0 hour for the purpose of inactivation. The nutrient solution is obtained.

Description

technical field [0001] The invention relates to the technical field of rice planting, in particular to a method for cultivating selenium-enriched rice. Background technique [0002] Paddy rice, originating in China, the fruit of paddy rice is paddy rice, claims rice or rice after shelling, is one of main food crops in the world. Rice was grown in the Yangtze River Basin in China 7,000 years ago. China's rice sowing area accounts for 1 / 4 of the country's grain crops, while the output accounts for more than half. According to different methods, rice can be divided into indica rice and japonica rice, early rice and middle and late rice, glutinous rice and non-glutinous rice. The fruit of rice is paddy, and paddy (grain) is called rice, fragrant rice, and rice after shelling. Nearly half of the world's population feeds on rice. The cultivation history has been 14000-18000 years. As an important food crop, it can be used for starch production, wine making and vinegar product...

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned prior art all uses inorganic selenium (selenate or selenite) as the selenium source of fertilizer, and the residual amount of inorganic selenium is large, and inorganic selenium has obvious poisonous effect to body, and safety is lower; The method of spraying inorganic selenium has the advantage that crops absorb quickly, but its disadvantages are also obvious. First, foliar spraying requires a relatively high content of selenium fertilizer, such as CN1382374A, selenic acid or selenous acid in selenium-enriched plant nutrition regulator The content of salt is 4-25%, high concentration of selenium fertilizer increases the cost of fertilizer