通过田间小区试验，研究了不同播期和密度对甘育3号产量及其构成因素的影响。结果表明，从播种到出苗以及全生育期天数均随播期的推迟显著减少，表明播期越晚，出苗所需要的时间越短，全生育期缩短；播期与种植密度均对甘育3号成熟期株高以及穗长无显著影响。同一时间播种，随着种植密度的增加，总穗数显著增多，但穗粒数以及千粒重均降低，从而导致减产；种植密度相同时，播期推迟，籽粒产量没有持续增大，而是在3月22日、3月29日出现较大值7 624.5、7 600.5 kg/hm2。

A field trial was conducted to study the effects of sowing date and density on yield and its components of Ganyu 3. The results showed that the number of days from sowing to seedling emergence and full growth of Ganyu 3 decreased significantly with the delay of sowing date， indicating that the later sowing date， the shorter the days needed for seedling emergence and full growth period； sowing date and planting density had no significant effect on plant height and ear length at maturity stage of Ganyu 3. Under the conditions of the same sowing date， with the increase of planting density， the number of panicles increased significantly， but the number of grains per panicle and 1000-grain weight decreased， thus led to reduction of the crop yield. When planting densities were the same， the grain yields did not continue to increase with the delayed sowing dates， and the maximum yields were 7 624.5 kg/hm2 and 7 600.5 kg/hm2 by the sowing dates of March 22 and 29.

S512.1