【摘要】 分析桂中地区4个播期晚稻生育期进程、期间气象因子变化及产量结构特征，揭示不同气象条件对晚稻生长发育和产量形成的影响。结果表明，不同播期各生长阶段天数存在明显差异，其中分蘖-拔节期差异最大（17～23 d），全生育期天数表现为播期4(122 d)>播期3(121 d)>播期1(120 d)>播期2(116 d)；气象条件方面，全生育期积温以播期1最高（3 033.9°C），降水量以播期1最高（562.3 mm），日照时数以播期4最长（736.6 h）；产量表现以播期2最优（5 581.65 kg/hm~2），较最低产量的播期4(3 129.45 kg/hm~2)增产2 452.20 kg/hm~2。实际产量与积温、降水量呈明显二次抛物线关系，积温在整个生育期起决定性作用；研究结果可为适宜播期安排、提高气候资源利用效率提供科学依据。更多还原

【Abstract】 By analyzing growth stages,meteorological factor variations,and yield structure characteristics of late rice under four different 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 periods,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(116days).Regarding meteorological conditions,the highest accumulated temperature during entire growth period was observed in sowing period 1(3 033.9 °C),the highest precipitation was in sowing period 1(562.3 mm),and the longest sunshine duration was in sowing period 4(736.6 h).Yield performance was optimal for sowing period 2(5 581.65 kg/hm~2),exceeding the lowest yield of sowing period 4(3 129.45 kg/hm~2)by 2 452.20 kg/hm~2.Actual yield exhibited a significant quadratic parabolic relationship between accumulated 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.更多还原