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Zinc deficiency The young leaves of the seedlings are light yellow and light white, and the central leaves have obvious green color, and the old leaves are grayish brown. At this time, it can be applied with 1.5-2.0 kg of zinc sulfate or foliar spray with 0.2-0.3% zinc sulfate solution, which can be sprayed 3 times, every 5-6 days.
Molybdenum deficiency The leaf veins of the old leaves are chlorotic and yellow, the leaves are scorched and curled inward, and the kernels shrink. At this time, foliar spray can be performed with 0.15%-0.2% ammonium molybdate solution.
Iron deficiency The leaf veins of the new leaves are green and yellow, the veins remain green and are obviously striped, and the stems and sheaths are purple-red. At this time, spray with 0.2-0.3% ferrous sulfate solution, spray 3 times, each interval 5-7 days.
Boron deficiency Young leaves can not be opened and white, gradually withered and dead, white streaks between the old leaves and veins, the plants are short and thin. At this time, 85 g of borax or 50-60 g of boric acid can be sprayed with 60 kg of water for foliar spraying, which can be sprayed 3 times, each interval of 5-7 days.
The symptoms of manganese deficiency often start from the new leaves, the young leaves turn yellow, there are green spots between the veins, the leaves are soft and the roots are slender and white. At this time, the 0.2% manganese sulfate solution can be used for foliar spraying 2-3 times, each interval of 7-10 days.
Copper-deficient plants grow slowly and are short, and they form clumps after the top forging, and the leaves are grayish yellow or red and yellow with white spots, and the ear development is poor. It can be applied to 1 kg of copper sulfate or foliar spray with 0.2% copper sulfate solution.
In the process of growth and development, the lack of trace elements in corn will show various symptoms. Identifying corn deficiency and scientific application of micro-fertilizer for remediation is an important technology in corn cultivation.
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