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近年来,上海郊区大面积扩种了“原丰早”、“中秆早”早稻中熟品种,增产效果是比较明显的。可是,由于落谷期宁迟勿早,秧令期宁短勿长,成为推广过程中的一个突出问题。因此,培育适令壮秧,进一步挖掘这两个品种的增产潜力,对促进早稻增产具有十分重要的现实意义。据研究,“原丰早”、“中秆早”第四叶到第七叶的出叶速度慢,要5～7天长一片叶,所以秧令弹性较大,一般可掌握在35天左右,即使超过40天,也不会明显超秧令。根
In recent years, a large area of Shanghai suburbs expanded the “original abundance of early”, “middle stalk early” medium maturing varieties of early rice, increasing the yield effect is more obvious. However, due to the late fall rather late, the shorter the seedling period, become a prominent issue in the promotion process. Therefore, to cultivate suitable strong seedlings and further tap the potentials for increasing yield of these two varieties has very important practical significance for promoting the yield increase of early rice. According to the study, “Harvest early”, “middle stalk early,” the fourth leaf to the seventh leaves of the leaves of slow, to 5 to 7 days long leaves, so seedlings so large flexibility, generally can be controlled at about 35 days, Even if more than 40 days, it will not be obvious super seedling orders. root