播期和栽插密度对协优084主要农艺性状及产量的影响

目的]寻求最适宜的杂交籼稻协优084播期和栽插密度。方法]在大田小区试验中,设4个播期:5月1日5、月11日5、月21日、5月31日,设5个密度:12万、18万2、4万3、0万和36万穴/hm2,研究不同的播期和栽插密度对协优084主要农艺性状及产量的影响。结果]随栽插密度的增加,协优084的基本苗、最高苗和有效穗呈上升趋势。协优084随栽插播期的推迟,其穗长呈下降趋势,每穗总粒数、每穗实粒数、结实率、单位面积的总颖花量和产量呈先增加后降低的趋势;随栽插密度的增加,其结实率、千粒重变化不明显,穗长、每穗总粒数和每穗实粒数呈下降趋势。结论]协优084在长江中下游地区的适宜播期为5月上中旬,中上等肥力水平下的适宜栽插密度为30万穴/hm2。

Effects of Sowing Date and Planting Density on Main Agronomic Characters and Yields of Xieyou 084

Objective] The study was to seek the most suitable sowing date and planting density of indica hybrid rice Xieyou 84.Method] 4 sowing dates of 1st, 11th,21st and 31st on May and 5 densities such as 120 000,180 000,240 000,300 000,and 360 000 aperture /hm2 were set up in field plot test.The effects of different sowing date and different planting density on main agronomic characters and yields of Xieyou 84 were studied.Result] The basic seedlings,the highest seedling and effective panicle of Xieyou 84 showed a rising trend along with the increasing of planting density.The ear length showed decreasing trend,the grain number per panicle,filled grain number per panicle,seed setting rate,total number of glumous flower and yields per unit area was first increased and then decreased trend with the delaying of sowing date of xieyou 84.The change of seed setting rate and 1 000-seed weight were not obvious,and the ear length,grain number per panicle and filled grain number per panicle had a decreasing trend with the increasing of planting density.Conclusion] The suitable sowing date of Xieyou 84 was early and middle in May in middle-lower Yangtze area,and its suitable planting density was 300 000 aperture/hm2 in the field with high and middle fertility.