播种期对3个再生稻品种产量及产量构成因子的影响

Effects of Sowing Date on Yield and Yield Components of Three Varieties of Ratooning Rice

以丰两优香1号、德优8258和新两优223为试验材料,探究湖北省再生稻适宜的播种期和影响再生季稻产量的主要产量构成因子。结果表明播种期对头季稻产量影响较小,对再生季稻产量影响显著。其中,3月24日播种的丰两优香1号和新两优223,再生季稻产量最高,分别为6 391.70和5 843.91kg/hm^2;3月30日播种的德优8258再生季稻产量最高,为5 723.93kg/hm^2。再生季稻产量随再生芽数、有效穗数和结实率的增加而显著增加。研究表明在湖北省,丰两优香1号和新两优223可在3月24日播种,德优8258可在3月30日播种。

In order to study the optimizing sowing date of ratooning rice and the main yield components factor which affects the grain yield in Hubei province, a field experiment was conducted in Shakou town, Honghu city, Hubei province from March to November in 2015 with widely used ratooning rice cultivars of Fengliang Youxiang 1, Deyou 8258 and Xinliangyou 223. Four sowing dates as March 18, March 24, March 30 and April 5 were used for all three ratooning rice cultivars. Results showed that the different sowing date had small effect on the main crop yield, but it could significantly affect the yield of ratooning crop（P〈0.05）. Both the Fengliang Youxiang 1 and Xinliangyou 223, which were sowed on March 24, had the highest yield of ratooning crop than the rest of sowing dates with the yield of 6 391.7kg/hm^2 and 5 843.91kg/hm^2, respectively. And the highest yield of ratooning crop of Deyou 8258 was observed in the sowing date of March 30 with the yield of 5 723.93kg/hm^2. In the study, the yield of ratooning crop was significantly increased with the increasing of regeneration bud, effective panicle number and seed setting rate（P〈0.05）. Therefore, the recommendation of optimizing sowing date for both Fengliang Youxiang 1 and Xinliangyou 223 could be March 24 and for Deyou 8258 it could be March 30 in Hubei province.