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迟熟中粳淮稻号直播密度试验结果表明:直播稻群体自我调节和产量结构相互协调补偿的能力很强,密度对直播稻产量影响不显著。基本苗4.6～14.3万/667m2,除基本苗5.8万/667m2,产量591.63kg/667m2以外,其他密度单产均达到600kg/667m2以上,基本苗8万/667m2左右产量最高。随着基本苗的增加,有效穗数总的趋势是上升的,每穗总粒数、结实率和千粒重振动式下降,但不同处理间差距很小。基本苗6万/667m2茎秆抗倒伏能力最强,且单位面积稻穗干物重、植株地上部分干物重及经济系数均最高。
The result of direct seeding density experiment of late japonica rice Huai’ao showed that the ability of self-regulation and yield structure compensation of direct seeding rice was strong and the density had no significant effect on the yield of direct seeding rice. Basic seedlings 4.6 ~ 143000 / 667m2, with the exception of the basic seedlings 58000 / 667m2, the yield of 591.63kg / 667m2, the other density of more than 600kg / 667m2, the basic output of about 80,000 / 667m2 about the highest yield. With the increase of basic seedlings, the overall trend of effective panicles increased. The total grains per panicle, seed setting rate and 1000-grain weight vibrations decreased, but the differences among different treatments were small. Basal seedlings 60 000 / 667m2 stalk lodging the strongest, and the dry weight of panicles per unit area, plant parts of the dry matter weight and economic factors were the highest.