Planting corn on calcareous soil is prone to white mosaic disease because the calcareous soil is mostly alkaline and zinc is difficult to dissolve in the soil. Plots rich in phosphorus or heavily applied to phosphate fertilizers may also cause zinc deficiency due to the weaker absorption of zinc by corn.
In general, the effective zinc content of the subsoil in most soils is low. Therefore, when leveling the land or building terraces, if the topsoil is not well restored, zinc deficiency is also likely to occur.
In addition, white wheat seedlings often occur when corn is grown in old wheat fields.
As a preventive measure, the most effective way is to supplement zinc. On the one hand, the application of base fertilizer. Mainly organic fertilizer, supplemented by chemical fertilizer, reasonable fertilization, organic fertilizer must be decomposed, and harmless treatment. About 2,500 kg of high-quality organic fertilizer and 1.5 kg of zinc sulphate per mu are mixed with organic fertilizer and applied to the soil in combination with soil preparation. On the other hand, scientific topdressing, mainly root dressing, is a good way to find zinc fertilizer after applying white corn seedlings. Spray 40-50 kg of zinc sulfate solution per acre at a concentration of 0.1% to 0.2%. From the time of jointing of the corn, spray once every 10 to 15 days, and spray 2 to 3 times.
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