Maize is a crop that needs more fertilizer. It is necessary to correctly grasp the types and quantities of nutrients needed for corn, and timely apply proper amount of nutrients to obtain high yields. Now we will look at the seedling diagnostic fertilization technology as follows:

Nitrogen deficiency corn has 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, spraying 1% to 1.5% urea. 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 to 20 kilograms can eliminate or reduce.

Phosphorus deficiency plants are prone to be very small, the early symptoms are purple-red leaves, slow growth, undeveloped roots, and thin stems 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.

In the initial stage of potassium deficiency, the edge of the lower leaf began to turn yellow and brown, gradually moved to 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 burnt; the other potassium deficiency was changed to the inside of the stem section. Dark brown. 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.

Other nutrient-deficient sulphur deficiency manifests as light green upper leaves and slow growth rates, which generally occur in soils with low sandy land and organic matter content. 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 yellowing lines, shortening between nodes, and dwarfing plants. Zinc deficiency could be sprayed with zinc sulfate at a concentration of 0.05%-0.1%.

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