桂中地区不同播期晚稻气象条件及产量特征OA

By analyzing growth stages,meteorological factor variations,and yield structure characteristics of late rice under four differ-ent sowing periods in central Guangxi,effects of varying meteorological conditions on growth and development and yield formation of late rice were revealed.Results has indicated that number of days for each growth stage varies significantly across different sowing peri-ods,with the largest variation observed during tillering-jointing stage(17～23 days).Total number of days for entire growth period followed order:sowing period 4(122 days)>sowing period 3(121 days)>sowing period 1(120 days)>sowing period 2(116 days).Regarding meteorological conditions,the highest accumulated temperature during entire growth period was observed in sowing period 1(3 033.9 ℃),the highest precipitation was in sowing period 1(562.3 mm),and the longest sunshine duration was in sow-ing period 4(736.6 h).Yield performance was optimal for sowing period 2(5 581.65 kg/hm2),exceeding the lowest yield of sow-ing period 4(3 129.45 kg/hm2)by 2 452.20 kg/hm2.Actual yield exhibited a significant quadratic parabolic relationship between accu-mulated temperature and precipitation,with accumulated temperature playing a decisive role throughout entire growth period.These findings has provided a scientific basis for optimizing sowing periods and improving efficiency of climate resource utilization.