为了探索水稻直播中稻+再生稻高产栽培模式,以优质软米稻德优8号为供试品种,在直播中稻+再生稻生产过程中设置了3个播种期和3个播种量水平共9个处理,研究各处理对水稻生育期、农艺性状、经济性状及产量的影响,并分析了各性状之间的相关关系以及播种期与播种量对水稻群体结构的影响.结果表明:头季中稻产量变幅为8572.5～10065.0 kg/hm2,平均产量为9202.5 kg/hm2,播期越早产量越高,且差异极显著,产量与播种量为正相关;再生稻产量变幅为2818.5～4554.0 kg/hm2,平均产量为3333.0 kg/hm2,再生稻产量与播种量呈负相关;两季总产量变幅为11578.5～13917.0 kg/hm2,平均产量为12888.0 kg/hm2,播期越早产量越高,且差异极显著,播种量越小产量越高.因此,3月下旬播种、用种量控制在15 kg/hm2,可提高有效穗、每穗着粒数和实粒数,中稻+再生稻的总产量更高,而且株高较低,可降低倒伏风险.%In order to study the high-yielding cultivation mode of medium rice + ratooning rice, using the soft rice Deyou No.8 as tested varieties, 9 treatments which contained 3 sowing date and 3 sowing level was conducted in the process of the production. It is explored the effects each process on the growth period, agronomic traits, economic traits and the yield, and analysis the correlation of each characters and the effect of sowing time and amount on the population structure of rice. The results showed that the first season rice yield ranged from 8572.5 kg/hm2 to 10065.0 kg/hm2, the average yield was 9202.5 kg/hm2, higher yield come up with earlier sowing time, the yield is positively correlated with the sowing amount, and difference is very significant. Therefore, if sowing in late March and seed quantity control in 15 kg/hm2, the effective panicle, grains per panicle and grain number can increase, the total yield of medium rice +ratooning rice will be higher, and the plant height is low, which can reduce the risk of lodging.
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