Maize deficiency fertilizer diagnostic fertilization technology

1, nitrogen deficiency

Corn needs more nitrogen than any other element. In the early stage of nitrogen deficiency, the seedlings appear light yellow and lateral fertilization can be used, as well as top-dressing and spraying 1%-1.5% urea solution. When corn grows to knee height, the demand for nitrogen fertilizer increases rapidly. At this time, nitrogen deficiency is easy. Firstly, the lower old leaf turns yellow from the tip of the leaf, then stretches along the veins, the leaf edge is still green, and finally the whole leaf turns yellow and dry. Cause premature aging of plants and spikelets, grain is not full, topdressing urea 10-20 kg can eliminate or reduce.

2. Phosphorus deficiency

Plants are prone to be very small, the early symptoms are purple-red leaves, slow growth, undeveloped roots, and thin stalks in the middle and late stages. The ear is sterile or thin and distorted. Phosphorus fertilizers can be added to phosphorus-deficient soils as base fertilizer and seed fertilizer, and potassium dihydrogen phosphate solution can also be sprayed on the leaves in time.

3, potassium deficiency

In the early stage, the edge of the lower leaf began to turn yellow and brown, and gradually moved toward the midrib of the leaf, and then moved to the upper leaf of the plant. The edge and tip of the leaf were dry and burning. Another symptom of potassium deficiency was dark brown in the inner part of the stem section. When potassium deficiency is severe, the growth stagnates, the internode shortens, the ear develops poorly or shows baldness, and it is prone to lodging. Can be applied to farmyard manure, potassium fertilizer, but also to spray potassium dihydrogen phosphate solution to improve.

4, other nutritional deficiencies

Sulfur deficiency manifests as light green upper leaves, slow growth, and generally occurs in sandy soils and low organic matter. Magnesium deficiency manifests as white strips on the lower part of the corn, with purple-red leaves. In the absence of copper, the upper leaves become dry and distorted. Zinc-deficit leaves appeared parallel to the midrib veins with yellowish lines, shortened internodes, and dwarfed plants. Zinc deficiency could be sprayed with zinc sulfate at a concentration of 0.05%-0.1%. Http://

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