Phosphorus deficiency. The lack of phosphorus in summer maize shows 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 25-30 kg of superphosphate per acre is used together with nitrogen fertilizer as base fertilizer.
Zinc deficiency. In the absence of zinc, the lower half of the young leaves of the summer maize seedling and growing seasons appear pale yellow or white, and after the leaves grow into, yellowish spots or chlorotic streak spots appear between the veins, and even mosaic symptoms can be seen. Severe zinc deficiency can be used in the seedbed 2.5-4 kg of zinc phosphate per acre. Live maize should be applied with 1-1.5 kg of zinc sulfate as base fertilizer. Can also be used to remediate the method of foliar fertilizer, sprayed with 0.1% -0.2% of zinc sulfate solution 2-3 times, spraying every 7-10 days, each time about 50 kg of fertilizer solution.
Boron deficiency. Symptoms of boron deficiency in summer maize are that the young leaves are not able to develop. The thinning of the veins in the upper leaves is white and transparent. 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% of boric acid or borax on the leaves 2-3 times, about 10 days apart and 50-75 kg each time.
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