播种量对水稻旱直播产量的影响研究

Study on the Effect of Seeding Rate on Yield of Dry Direct-seeding Rice

本研究利用3份水稻材料,分析了其在旱直播条件下的适宜播种量。结果表明:随着播种量的增加,水稻生育期变短,株高逐渐变矮,单株分蘖量减少;JZ-1、JZ-3、JZ-5三份材料理论产量均随播种量的增加呈现抛物线趋势,在播种量200 kg/hm2条件下达到最高值,有效穗数逐渐增加,穗长、穗实粒数与千粒重小幅上升总体呈降低趋势。

Three rice materials were used to analyze the suitable sowing rate of rice under the condition of dry direct-seeding.The results showed that,with the increase of seeding rate,the growth period became shorter,the height became shorter and the valid tillering rate per plant decreased.The theoretical yield of JZ-1,JZ-3,JZ-5 showed a parabola trend with the increase of sowing rate,and reached the highest value under the condition of 200 kg/hm2,the valid panicle number increased gradually,the panicle length,the grain number per panicle and 1000-grain weight increased slightly and decreased as a whole.