机插密度对连作晚稻“甬优6号”产量的影响

目的]研究机插密度对连作杂交晚稻"甬优6号"产量的影响,明确其合理的群体起点,为连作稻区晚季杂交稻机插技术的推广提供科学依据。方法]根据插秧机设计的行株距规格,设栽插丛数为12万、15万、18万、21万和24万丛/hm25个处理,采用小区重复试验,对产量进行方差分析。结果]随着机插密度的增加,单位面积最高苗数、有效穗增加,穗粒数减少,成穗率降低;机插密度过高或过低均不利于增产增效。结论]"甬优6号"在温州地区作连作晚稻种植,机插密度以21万丛/hm2左右,每丛插2.5～3.5本较适宜。

Effect of Mechanical Transplanting Densities on the Yield of Late Rice "Yongyou NO.6" in Continuous Cropping

Objective ] To study the effect of mechanical transplanting densities on the yield of late rice ＂Yongyou NO. 6＂ in continuous crop- ping to confirm the reasonable population, and to provide the scientific basis for provide the scientific basis for promotion of mechanical trans- planting technology in late hybrid rice at continuous cropping rice planting area. Method ] According to the design of rice transplanter, the transplanted hills per hectare were set at 5 levels（12, 15, 18, 21 and 24 ten thousands） by repeated to do variance analysis of the yield. Result] The result showed that when the mechanical transplanting density increases, the maximum tillers and effective panicles increase, but the number of grains and effective panicle percentage decrease per unit area. It is harmful to inncrease yield, when the density is too high or too low. Conclusion] When taking ＂Yongyou NO. 6＂ as continuous cropping late rice in Wenzhou area, the suitable mechanical transplanting density is 21 x 10^4 hills per hectare, 2.5 -3.5 seedlings per hill.