以杂交中籼迟熟组合宜香优300和川谷优642为材料，在海南陵水旱季大田条件下，研究了分蘖期干旱处理对中籼迟熟杂交稻产量的影响及其缓解技术。结果表明，干旱会造成水稻减产，主要原因是有效穗数和穗粒数显著降低；干旱期间平均田间持水量可作为预测产量损失度的依据；分蘖期干旱处理下，稻谷产量随着施氮量和移栽密度的增加而增加，适当提高本田施氮水平和移栽密度，可显著降低分蘖期干旱的产量损失度。

The effects of drought in tillering stage on yield and its mitigation techniques were studied in the field in dry-season conditions of Lingshui County of Hainan Province，the medium indica hybrid rice combination Yixiangyou 300 and Chuanguyou 642 as materials. The results showed that the effective panicles and spikelets per panicle were significantly reduced by drought in tillering stage, which were the main factors of yield lost. The average soil moisture content during the drought stage can be used as the basis for predicting the yield loss. The yield increased with the increase of nitrogen rate and transplanting density. The yield loss degree of drought in tillering stage could significantly reduce by appropriate nitrogen rate and transplanting density.