杂交稻制种始穗期不同时刻喷施九二○对结实率的影响广西融水县种子公司韦松杂交稻不育系繁殖和制种技术中，适时适量喷施九二○对穗茎的伸长解除包颈，使之穗粒外露，增加授粉，提高种子产量有着十分重要的作用。在前几年已发现上午喷施九二０的效果好于下午喷施的。为此... Spraying hybrid rice at different times at the beginning of the 1990s on the impact of seed setting rate Guangxi Rongshui County Seed Company hybrid rice sterile line breeding and seed production techniques, timely and appropriate spraying nine two o’clock on the ear Extend the lifting of the neck pack to make the grain exposed, increase pollination and improve seed yield has a very important role. In the past few years, it has been found that the effect of spraying the 92.0 am in the morning is better than that of spraying in the afternoon. to this end...