播期对三江平原主栽水稻品种生育期和产量的影响

Effects of Sowing Date on Growth Duration and Yield of Main Planted Rice Varieties in Sanjiang Plain

通过播期试验对三江平原5个主栽水稻品种的主要生育时期、生育期、产量及其构成因子进行分析,结果表明,播期推迟,品种生育期均明显缩短,且主要体现在出苗-拔节阶段生育天数的减少,拔节-抽穗、抽穗-成熟阶段变化不显著;播期推迟,出苗到抽穗天数减少,这与日均温度升高、日均光照时数减少有关;晚熟品种早播有利于获得高产;中早熟品种可以适当推迟播期,以求达到更高产量。

The main growth stages,growth duration,yield and yield components of the five main planted rice varieties in Sanjiang plain were analyzed by sowing date test.The results showed that when the sowing date was delayed,the growth duration of varieties reduced significantly,and mainly reflected in the reduction of the growth days from seeding to jointing,there were no significant changes from jointing to heading and heading to maturity;the days from seeding to heading was reduced,which was related to the increase of the average daily temperature and the decrease of the average daily light hours.The later-maturing varieties were conducive to high yield by early seeding;the medium-maturing varieties and early-maturing varieties could reach higher yield by properly delaying the sowing date.