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低温对双季晚稻孕穗和开花期的危害都会影响产量,避过低温的途径是将安全保证率提高到95％,齐穗期提早到9月5日前。只有中籼型品种可以在此时期内齐穗。在安全期内齐穗的杂交晚稻,年度间产量的绝对值及稳产性均较常规晚粳为高。其产量潜力远大于常规晚粳。保证杂晚齐穗期避过低温危害夺取高产、稳产的关键技术是提早播种期,延长秧龄,育成壮而不老的多蘖壮秧和氮肥一次基施。
The effects of low temperature on the booting season and flowering stage of double cropping late rice all affect the yield. The way to avoid the low temperature is to increase the safety guarantee rate to 95% and the heading date to earlier than September 5. Only medium-indica cultivars can be panicles within this period. During the safety period of heading hybrid late rice, the annual output of the absolute value and the stability of the late japonica rice were higher than conventional. Its yield potential is far greater than conventional late Japonica. To ensure that the hybrid at full heading to avoid the dangers of low temperature to seize high yield, steady production of key technologies is early sowing, prolongation of seedling age, fertility and not old and more tiller seedling and nitrogen fertilization facilities.