Phosphorus deficient maize exhibited poor root development and slow growth at seedling stage. The obvious phosphorus deficiency in the plant was concentrated in the 5-leaf stage, with symptoms such as purple-red leaves, purple tips, and frizzy leaves. Phosphorus deprivation also causes the filaments to pull out slowly, affecting the pollination, and the ear curls, the ear rows do not line up, the grain is not full, baldness appears, and the ripening period is delayed. Therefore, it should be ensured that 25 to 30 kg of superphosphate per acre is used together with nitrogen fertilizer as base fertilizer.
In the absence of zinc and zinc deficiency, the lower half of the young leaves of the corn seedling stage and growth stage are pale yellow or even white. After the leaf grows, yellowish spots or lack of green stripe spots appear between the veins, and even mosaic symptoms can be seen. Severely lack of zinc can be used in the seedbed 2.5 to 3 kg of zinc phosphate per acre. Live maize should use 1 to 1.5 kg of zinc sulfate as base fertilizer. Can also be used to remediate the method of foliar fertilizer, sprayed with 0.1% to 0.2% of zinc sulfate solution sprayed 2 to 3 times, sprayed every 7 to 10 days, each spray fertilizer solution is about 50 kg.
The deficiency of boron in the boron-deficient maize is due to the weakness of young leaves. The thinning of the veins in the upper leaves shows a white, transparent stripe. The growth of plants is thin and short, and the ear is deformed. The grain arrangement is irregular, shrinking, and the top grain is empty. The remedy is to spray 0.2% boric acid or borax 2 or 3 times on a foliar spray. Each time the interval is about 10 days, 50 to 75 kg of fertilizer is sprayed.
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