播期对“四特”晚籼稻生长发育、产量及温光资源利用的影响

Effects of sowing date on growth,yield and utilization of temperature and light resources of“Si Te”late Indica rice

为探究播期对“四特”晚籼稻生长发育、产量及温光资源利用的影响,确定“四特”晚籼稻的适宜直播日期,设置5个播期,以4个“四特”晚籼稻试验材料进行田间试验。结果表明,“四特”晚籼稻产量随着播期的推迟呈下降趋势,其主要原因是每穗总粒数随播期的推迟显著降低;除7月10日播种外,其他播期条件下均能安全齐穗;全生育期积温和日照时数及利用率均以6月20日播种最高,6月30日或7月5日播种最低。综合考虑播期对产量、温光资源利用、安全齐穗成熟等因素的影响,6月20日是“四特”晚籼稻直播的最佳播期,但考虑到腾茬、农事操作等因素,最迟直播播期为7月5日。

In order to investigate the effects of sowing date on growth and development,yield and utilization of temperature and light resources,determine appropriate direct seeding date of“Si Te”late Indica rice,a field experiment was carried out with 5 sowing dates and 4“Si Te”late Indica rice materials.The results showed that the yield of“Si Te”late Indica rice was decreased with sowing date de⁃lay,and the main reason was that the total grain number per panicle decreased significantly with sowing date delay.Unless sowed on July 10,full heading could be safely achieved under other sowing dates.Temperature and light resources utilization rate of whole growth period were the highest on sowing date of June 20,and the lowest on June 30 or July 5.In consideration of yield,temperature and light resource utilization,security full heading and mature,June 20 is the best sowing date of“Si Te”late Indica rice,but consid⁃ering crop arrangement and farming operation,the latest sowing date is July 5 of“Si Te”late Indica rice.