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研究了不同播期对春玉米叶片生长,及氮肥不同施用方法对产量的影响。结果表明,春玉米每展开1片叶所需要的时间受气温的影响很大,气温高时1～2d展开1片,气温低时5～6d甚至7～9d展开1片。春玉米于叶龄指数35～40轻施攻秆肥,于叶龄指数60～70重施攻穗肥,能获得最佳产量。
The effects of different sowing dates on the growth of spring maize leaves and the different application methods of nitrogen fertilizer on the yield were studied. The results showed that the time required for each leaf of a spring maize was greatly influenced by the temperature. When the temperature was high, 1 slice was carried out in 1 ~ 2 days and 1 slice was taken in 5 ~ 6 days or even 7 ~ 9 days when the temperature was low. Spring corn in the leaf age index 35 ~ 40 light straw attack fertilizer, leaf age index 60 ~ 70 heavy attack spike fertilizer, to obtain the best yield.