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一、我省连晚品种存在问题 我省在地理上处温带到亚热带之间,为水稻生产上一熟到二熟的过渡地区。由于早春和晚秋南北气流的交绥,使得这个期间的气候变化复杂,影响水稻安全生育,特别是连作晚稻生产大受威胁。从武汉市1907～1958年有记录的42年日平均温度资料看,如果以22°→15℃为二晚抽穗至成熟的影迟安全界限,则应为9月25日～11月5日之间的40天左右(籼稻还应适当挪前)。在这个范围之内,现有的一般晚稻品种利用培育老壮秧
First, the province even the late varieties of problems My province is located in the geographical temperature between the subtropics, for the production of rice on a ripe to second-cooked transitional areas. Due to the intersection of the north and south airstreams in early spring and late autumn, the climate change during this period has been complicated and affected the safe breeding of rice. In particular, the production of late rice is seriously threatened. According to the recorded daily average temperature data of 42 years from 1907 to 1958 in Wuhan, if the safety margin of heading to maturity at 22 ° → 15 ℃ for two nights is reached, it should be from September 25 to November 5 Between about 40 days (indica should also be appropriate before moving). Within this range, the existing general late rice varieties are used to cultivate old strong seedlings