During rice heading, the surface of the leaves is sprayed with ethephon, which can promote the early maturity of rice for 2 to 3 days, and can reduce the empty grain and increase the grain weight. The concentration of sprayed ethephon is generally from 1000 to 1200 ppm. The spraying time can be carried out 3 to 10 days after the rice heading. Can not be too early, so as not to affect the normal flowering of rice, resulting in lowering of the seed setting rate and reducing production; too late, due to the late growth stage of rice itself also produces a certain concentration of ethephon, spraying effect is not satisfactory.
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