播种期和留桩高度对再生稻产量及产量构成因素的影响

为探明洞庭湖平原区不同播种期和留桩高度条件下再生稻产量及产量构成因素的变化特征,明确该区域适宜的播种期和留桩高度,以黄华占为材料,开展了不同播种期和留桩高度对再生稻产量及产量构成因素影响的研究。结果表明:以4月15日播种的再生稻产量最高,达3 486.8 kg/hm~2;留桩高度为30 cm的再生稻产量最高,为3 474.5 kg/hm~2;4月15日播种、且留桩高度为30 cm的两季水稻产量最高,为13 933.5kg/hm~2。由此可见,在洞庭湖平原区采用直播方式作再生稻,以4月15日左右播种、留桩高度30~40 cm,能获得较高的两季水稻产量。

Effects of Sowing Dates and Stubble Height of Retaining Piles on Grain Yield and Yield Components of Ratooning Rice

In order to find out the changing characteristics of grain yield and yield components of ratooning rice under different sowing dates and stubble height in Dongting Lake plain area, and to determine the suitable sowing time and the stubble height, using Huanghuazhan as material to study the effects of different sowing dates and stubble height on the yield and yield components of retooning rice. The results showed that the highest grain yield of retooningrice was reaching 3486.8 kg/hm2 when the sowing date was in April 15th;and the highest grain yield of retooning rice was 3474.5 kg/hm2 when the stubble height was 30 cm. The highest double cropping grain yield of retooning rice was 13933.5 kg/hm2 when the sowing date was in April 15th and the stubble heightwas 30 cm.It can be seen that in the plain area of Dongting Lake, the direct seeding method was used for the retooning rice and it can be obtained two seasons high yield rice by stubble height was 30~40 cm and sowing around April 15th.