Control Measures of Zinc Deficiency and White Seedling of Maize

In the corn field, "white seedlings" often appear at the 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 light yellowish white, 5-6 leaf stage, 1-3 leaf under the heart leaf appears light yellow and light green stripes, but the vein is still green, the base appears purple stripes, after 10-15 days, the purple gradually becomes yellowish white, the mesophyll becomes thinner, showing a "white seedling". In severe cases, a piece of white, zinc-deficient corn plants in the whole field are short, internodes are short, leaf pillows overlap, heart leaves grow slowly, look flat-topped, and in severe cases, white leaves gradually dry up, or even the whole plant dies.

Control measures to increase the application of base fertilizer: mainly organic fertilizer, supplemented by chemical fertilizer, reasonable fertilization, organic fertilizer must be mature, harmless treatment. About 2500 kg of high-quality organic fertilizer and 1.5 kg of zinc sulfate were applied per mu, which were mixed with organic fertilizer, combined with soil preparation and applied to the soil as base fertilizer. Seed dressing with zinc fertilizer: every kilogram of corn seeds can be mixed with 20 grams of zinc sulfate, dissolve the fertilizer with a little water, then spray it on the seeds, then mix well, dry and sow the seeds. Scientific topdressing: mainly extra-root topdressing, which is a good way to apply zinc fertilizer after the discovery of corn "white seedlings". The concentration and dosage of zinc sulfate solution with 0.1% zinc sulfate concentration of 0.2% per mu is 40kg / mu. From the time of corn jointing, the zinc sulfate solution is sprayed every 10 to 15 days for 2 times, and the effect is obvious.