Rice planting method

Abstract

The invention discloses a rice planting method including the steps of soil preparation, rice seedling transplanting and field management. When the soil preparation is performed before rice transplanting, ferrous sulfate is applied in soil, or / and is sprayed to the overground part of rice 7-15 days after the rice transplanting, the first to tenth day of an elongation stage, the first to seventh day of an flowering stage and the seventh to 21st day after the flowering stage. According to the method, the ferrous sulfate is reasonably applied, so that the accumulation of cadmium in the rice is effectively controlled, cadmium contents in brown rices of the rice Yongyou No. 9 with high accumulation of cadmium and the rice Xiushui 09 with high accumulation of cadmium are respectively reduced by 79 percent and 86 percent maximally, and the cadmium contents in the brown rices respectively are only 0.05 mg per kg and 0.02 mg per kg, and far below 0.2 mg per kg of a national regulation. A good solution is provided for heavy metal pollution of rice, the applying times and amount of the ferrous sulfate are both less, the cost is low, and the operation is convenient.

Description

technical field [0001] The invention belongs to the technical field of rice planting, in particular to a method for planting rice. Background technique [0002] Cadmium is a dangerous environmental pollution element. The world releases about 30,000 tons of cadmium into the environment every year, of which 82% to 94% will enter the soil. In China, only 80 million mu of arable land is polluted by cadmium, and nearly 180 million mu of arable land is polluted by cadmium and arsenic. Long-term intake of rice, vegetables, fruits, water, etc. that are seriously polluted by cadmium will cause symptoms of chronic cadmium poisoning, and even cause cadmium to accumulate in the body, leading to "pain disease". [0003] Rice is the most important grain crop in China. 65% of Chinese people take rice as the absolute staple food. Rice is also the bulk cereal crop that absorbs the most cadmium. The cadmium level in its grain is second only to lettuce. , the available cadmium content in pad...

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned patent alleviates the problem of cadmium accumulation in rice to a certain extent without affecting the normal growth and development of rice, reducing the cadmium content in brown rice to 0.058-0.39mg / kg, and the cadmium content in polished rice to 0.04-0.28mg / kg, but there are still the following problems: (1) the adjustment dosage of the application is large, and it is necessary to apply 15 to 90 kg / ha of manganese in the soil only when the soil is prepared, and the cost is high; (2 ) is applied frequently, and divalent manganese chelate regulators need to be frequently applied during the entire growth period of rice, which is cumbersome to operate and increases labor costs

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