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夏玉米是我国北方的主要秋粮作物,栽培面积大,产量高。但在玉米的栽培实践中,时常在苗期出现脱肥的异常现象,必须及时查明原因,并采取对应的措施。黄叶苗—缺氮。如夏玉米植株绿色变浅,特别是叶子显著变黄,即为缺氮的表现。变黄叶片首先从下部老叶开始,植株矮小,根系不发,生长缓慢,后期穗小粒少,枯死早,产量低。防治黄叶苗在播前就应施
Summer maize is the main autumn crop in northern China, with a large cultivation area and high yield. However, in the practice of corn cultivation, it is often necessary to find out the cause of the abnormal phenomenon of removing fat during the seedling stage and take the corresponding measures. Yellow leaf seedlings - nitrogen deficiency. Such as summer corn plants green shallow, especially yellowing of the leaves significantly, that is, the performance of nitrogen deficiency. Yellowing leaves first start from the lower part of the old leaves, plant dwarf, root system does not fat, slow growth, late ear small grains, dead early, low yield. Yellow leaf seedlings should be applied before sowing