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一、缺氮症状及矫正措施症状:玉米需氮量大,苗期缺氮时植株生长缓慢、矮瘦,叶色黄绿,抽雄迟;生长盛期缺氮,老叶从叶尖沿着中脉向叶片基部枯黄,枯黄部分呈“V”形,叶缘仍保持绿色而略卷曲,最后呈焦枯状而死亡。在缺氮条件下,下部老叶中的蛋白质分解后转移到生长旺盛的部分。就单株玉米来看,缺氮症状首先表现为老叶先发黄,而后逐渐向嫩叶扩展。矫正措施:提倡施用种肥,或5叶期前追施提苗肥;大喇叭口期追肥后,注意适时适量地追施攻粒肥。
First, the nitrogen deficiency symptoms and corrective measures Symptoms: corn nitrogen demand, seedling nitrogen deficiency plants grow slowly, thin, yellow and green leaves, tasseled late; growth period of nitrogen deficiency, old leaves from the tip along the midrib Yellowish to the base of the leaves, yellowish part of the “V” shape, the leaf margin remains green and slightly curly, finally dead coke-like. In the absence of nitrogen, the protein in the lower leaves is decomposed and then transferred to the more vigorous parts. Corn on a single point of view, the first symptoms of nitrogen deficiency showed the first yellow leaf, and then gradually to the expansion of young leaves. Corrective measures: to promote the use of fertilizer, or topdressing 5-leaf period to mention Miaofei; big trumpet period of top dressing, pay attention to timely manner appropriate topdressing granulation fertilizer.