1987年大面积种植单季晚稻以来，影响粮食单位面积产量变化的气象条件与1987年之前有着明显的差异。
Since 1987, late rice is planted in extensive area. The meteorological factors influencing the variation of grain yield per unit area from 1987 on differ obviously with those before 1987.
结果表明 ，千金子在直播田只有一个发生高峰期 ，单季晚稻直播田和连作晚稻直播田发生高峰期在播后 1周 ，早稻直播田发生高峰期在播后 2周。
It showed that Chinese sprangletop germinates to have an emergence peak at 1 week after rice seeded in one season late rice and two season late rice or 2 weeks in early rice.
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