Control Measures for White Seedlings in Corn Caused by Zinc Deficiency
Control Measures for White Seedlings in Corn Due to Zinc Deficiency
In corn fields, "white seedlings" often appear at the seedling stage, which is caused by zinc deficiency. Generally starting from the 4-leaf stage, the leaf color at the base of new leaves becomes lighter and turns yellowish-white; at the 5-6 leaf stage, the 1st to 3rd leaves below the heart leaf show stripes alternating between pale yellow and pale green, but the leaf veins remain green, and purple stripes appear at the base; after 10-15 days, the purple gradually turns yellowish-white, the leaf mesophyll becomes thin, presenting "white seedlings". In severe cases, the whole field turns white; zinc-deficient corn plants are short and small, with short internodes, overlapping leaf collars, and slow growth of the heart leaf, appearing flat-topped; in severe cases, the white leaves gradually dry up, and even the whole plant dies.
Control measures: Increase base fertilizer application: mainly use organic fertilizer, supplemented by chemical fertilizer, and fertilize reasonably. Organic fertilizer must be fully decomposed and subjected to harmless treatment. Apply about 2500 kg of high-quality organic fertilizer per mu and about 1.5 kg of zinc sulfate, mix them together with the organic fertilizer, and apply them into the soil as base fertilizer while preparing the land. Seed dressing with zinc fertilizer: mix 20-40 g of zinc sulfate per kg of corn seed. When dressing the seeds, first dissolve the fertilizer with a small amount of water, then spray it on the seeds, mix well, and sow after drying. Scientific topdressing: mainly foliar topdressing, which is a good method for supplementing zinc fertilizer after "white seedlings" are found in corn. The concentration and amount are 40-50 kg per mu of 0.1%-0.2% zinc sulfate solution, starting from the jointing stage of corn, spraying once every 10-15 days, for 2-3 consecutive sprays, with relatively obvious effects.
Control measures: Increase base fertilizer application: mainly use organic fertilizer, supplemented by chemical fertilizer, and fertilize reasonably. Organic fertilizer must be fully decomposed and subjected to harmless treatment. Apply about 2500 kg of high-quality organic fertilizer per mu and about 1.5 kg of zinc sulfate, mix them together with the organic fertilizer, and apply them into the soil as base fertilizer while preparing the land. Seed dressing with zinc fertilizer: mix 20-40 g of zinc sulfate per kg of corn seed. When dressing the seeds, first dissolve the fertilizer with a small amount of water, then spray it on the seeds, mix well, and sow after drying. Scientific topdressing: mainly foliar topdressing, which is a good method for supplementing zinc fertilizer after "white seedlings" are found in corn. The concentration and amount are 40-50 kg per mu of 0.1%-0.2% zinc sulfate solution, starting from the jointing stage of corn, spraying once every 10-15 days, for 2-3 consecutive sprays, with relatively obvious effects.