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2, phosphorus deficiency symptoms of corn, phosphorus deficiency in the seedling stage, even if the supply of sufficient phosphorus in the later period is difficult to make up for the early adverse effects. Phosphorus deficiency at seedling stage, poor development of maize roots, slow growth, leaves purple-red after 5 leaves, purple tip, and curled leaves.
3. Potassium deficiency in corn When the corn is deficient in potassium, the roots are poorly developed, the plants grow slowly, the leaves are light green and have yellow stripes. In severe cases, the leaf margins and leaf tips are purple, then the dryness is burning, and the middle part of the leaves is still Keeping green, the leaves are gradually changing. The symptoms of potassium deficiency are first expressed on the lower old leaves.
4, zinc deficiency symptoms of severe zinc deficiency in the emergence of white seedlings. White seedlings were present in the 3-5 leaf stage, and the young leaves were light yellow or white, especially at 2/3 of the base of the leaves. In the middle and late stages, the internodes were shortened, the plants were shrunk, and the roots were black. Growth is hindered, and no result is that the ear or ear is severely bald, and even dry and die.
5. Iron deficiency symptoms When the corn is iron-deficient, the upper leaves are chlorotic and yellow, followed by the middle and lower parts. The leaves show yellow-green interlaced stripes. When severe, the leaves are yellow and the leaves turn white.
Huaxian County Fertilizer Station Zhao Dongli 
1. Symptoms of nitrogen deficiency in corn The deficiency of nitrogen in corn is first manifested by the fact that the old leaves first become yellow and then gradually expand to the young leaves. Nitrogen deficiency at seedling stage, slow growth of corn, short stature, yellow-green leaf color, and late male. Nitrogen deficiency during the growth phase, the leaf symptoms are more obvious.
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