以川谷优642、蓉优1015和川谷优7329为材料，于2014年进行模拟洪水淹没试验，研究“洪水”淹没时期、留桩高度、促芽肥用量及植物生长调节剂对受淹后头季稻及再生稻产量及产量构成的影响。结果表明：（1）开花时淹没48 h，头季稻结实率和千粒重显著下降，分别降低23.6%和6.5%；开花后2 h和4 h受淹对头季稻结实率和千粒重影响不显著。（2）促芽肥施用量对再生稻产量影响显著，施氮量为105 kg/hm2的处理比施氮量为35 kg/hm2和70 kg/hm2的处理分别增产33.5%和8.3%，较高的有效穗数、每穗粒数和结实率是其增产的主要原因；留桩高度及其与促芽肥施用量互作对产量影响不显著。（3）受淹后叶面喷施“喷长精”和“美洲星”有利于提高有效穗数、每穗粒数和结实率，与喷清水相比，其再生稻产量分别提高15.2%和17.4%；叶面喷施多效唑可显著提高最高分蘖和结实率，但其每穗粒数居劣势，增产效果不明显。

Three experiments with three mid-hybrid rice cultivars （Chuanguyou 642, Rongyou 1015 and Chuanguyou 7329） were conducted in 2014 in Luxian county to determine the effects of submergence time, stubble height, budding-promoting fertilizer and plant growth regulators on yield and yield components of mid-hybrid rice and ratoon rice. The results showed that: 1） Submergence 48 h at flowering stage, grain filling and grain weight of mid-hybrid rice were decreased by 23.6% and 6.5%, respectively, compared to control treatment （no flood stress, CK）, however, the difference was relatively small between 2 h, 4 h after flowering submergence 48 h and CK. 2） The grain yield of ratoon rice significantly increase with budding-promoting fertilizer application. Compare to 35 kg/hm2 and 70 kg/hm2, the grain yield under 105 kg/hm2 increased by 33.5% and 8.3%, respectively, owing to the higher panicles per m2, spikelets per panicle and grain filling. The grain yield of ratoon rice was no significantly affected by stubble height and interaction effects of stubble height by budding-promoting fertilizer. 3） Penchangqing and Meizhouxing improved the panicles per m2, spikelets per panicle and grain filling and increased grain yield of ratoon rice by 15.2% and 17.4%, respectively, compared with water （CK）. The maximum tiller and grain filling of Paclobutrazol was higher but the spikelets per panicle were lower than those of water （CK）, and there was no significant effect on grain yield of ratoon rice.