In the corn field, white seedlings often appear at seedling stage, which is caused by zinc deficiency. Generally from the 4 leaf stage, the leaf color at the base of the new leaf becomes pale yellowish-white. At the 5-6 leaf stage, yellowish and light green stripes appear on the lower 1-3 leaves of the heart, but the veins are still green and the purple stripes appear at the base. After 10-15 days, the purple color gradually turns yellow-white, and the leaves become thin. , was "white seedlings." When serious, the whole field is white. Zinc-deficient corn plants are dwarf, with short internodes, overlapping leaf pillows, slow-growing hearts, and a flat top. In severe cases, white leaves gradually dry out, and the entire plant dies.
Prevention
Rational fertilization organic fertilizer must be decomposed and harmless. About 2,500 kilograms of high-quality organic fertilizer is applied per 667 square meters, and about 1.5 kilograms of zinc sulfate is mixed with organic fertilizer, combined with soil preparation, and applied to the soil.
The top-dressing fertilizer for science is mainly the top-dressing fertilizer. This is a good way to supplement zinc fertilizer after discovering the “white seedlings†of corn. Concentration and dosage is 40-50 kg of zinc sulfate solution sprayed with a concentration of 0.1%-0.2% per 667 square meters, starting from the time of corn jointing, spraying once every 10-15 days, even spraying 2-3 times, the effect More obvious.
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