The wheat seedling stage is deficient in nitrogen, first from the tip of the yellow tip, then gradually expands downward, the seedlings are weak, the leaves are narrow and short, the color is yellow, the roots are less and less; the phosphorus deficiency, the root system is poorly developed, the seedlings are yellow, the tip of the leaves Purple, slow growth; potassium deficiency, slow growth, short stems and leaves, dark green or blue-green leaves, yellow tip and edge, severely dead leaves, poor root growth.
In the absence of nitrogen, the miners should be applied in time for the three-leaf stage of wheat seedlings, and 8 to 10 kilograms of urea should be applied to the acre; phosphorus deficiency can be used to chase 25 kilograms of calcium phosphate or 5 to 10 kilograms of diammonium phosphate, or 0.2% to 0.3%. Foliar spray of potassium dihydrogen phosphate solution; potassium deficiency, can be chased with potassium chloride 8 ~ 10 kg or 0.2% ~ 0.3% potassium dihydrogen phosphate solution foliar spray.
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