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 between the 1st and 3rd leaves of the heart, but the veins are still green and the purple stripes appear at the base. After 10 to 15 days, the purple color gradually turns yellow-white, and the leaves lose weight. , 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.
Control measures: 1 increase base fertilizer. Mainly organic fertilizer, supplemented by chemical fertilizers, rational fertilization, organic fertilizers must be decomposed and harmless. About 2,500 kilograms of high-quality organic fertilizer is applied per acre, about 1.5 kilograms of zinc sulfate, mixed with organic fertilizer, combined with soil preparation, and applied to the soil as base fertilizer. 2 zinc fertilizer dressing. It can mix 20-40 g of zinc sulfate per kilogram of corn seed. When dressing, first dissolve the fertilizer with a little water, spray it on the seed, mix well, and dry it and sow. 3 scientific fertilizer. Mainly outside the root dressing, this is the discovery of corn "white seedlings", make a good application of zinc fertilizer. Concentration and dosage is sprayed with 0.1 to 0.2% zinc sulfate solution per acre 40 to 50 kg, starting from the time of corn jointing, spraying once every 10 to 15 days, even spraying 2 to 3 times, the effect is more obvious .
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