适当的早播或晚播可以降低稻米垩白度；
Rice chalkiness degree decreased in timing early or late sowing.
晚播可延长营养生长的时间，增大叶面积指数、延迟现蕾、集中结铃作用明显。
When sowing time was later, the nutrition growth period was prolonged, the leaf area index was increased, and budding stage was prolonged.
结果表明：适时晚播缩短了大豆的营养生长阶段，而对生殖生长阶段的影响较小。
The results showed that; feasible late sowing reduced nutritive growth period and there was little effect on reproductive growth period.
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