In the corn field, “white seedlings†often appear in the seedling stage. What is the cause of this?
Corn white seedlings are caused by zinc deficiency. Generally, from the 4-leaf stage, the leaf color of the base of the new leaves becomes yellowish white. In the 5~6 leaf stage, the yellowish and pale green stripes appeared in the 1~3 leaves under the heart leaf, but the veins were still green, and purple stripes appeared at the base. After 10~15 days, the purple gradually turned yellowish white, and the mesophyll became thinner. It is "white seedling". In severe cases, the whole field is white. The zinc-deficient corn plants are short, the internodes are short, the leaf pillows overlap, the heart leaves grow slowly, and the flat tops appear. In severe cases, the white leaves gradually dry up and even the whole plant dies.
Control technology
Adding base fertilizer : mainly organic fertilizer, supplemented by chemical fertilizer, reasonable fertilization, organic fertilizer must be decomposed, and harmless treatment. Apply about 2,500 kilograms of high-quality organic fertilizer per acre, about 1.5 kilograms of zinc sulfate, mix with organic fertilizer, combine with the soil, and apply it to the soil as a base fertilizer. Zinc fertilizer seed dressing: You can mix 20~40g of zinc sulfate per kg of corn seeds. When mixing seeds, dissolve the fertilizer with a little water, spray it on the seeds, then mix well, dry and then sow.
Scientific topdressing: Mainly root dressing, this is a good way to apply zinc fertilizer after the discovery of corn "white seedlings". The concentration and dosage are 40~50 kg of zinc sulfate solution with a concentration of 0.1%~0.2% per acre. It is sprayed once every 10~15 days from the jointing of corn, and even sprayed 2~3 times. The effect is obvious. .
Therefore, in the process of planting crops, fertilization is also a matter of study, must be scientifically fertilized, the amount of fertilizer should be appropriate, not too much, not too little. This will allow the crop to grow well.
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