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.
Zinc deficiency: young leaves in the seedling stage are light yellow and even white seedlings are produced. The middle leaves have obvious green color, and the old leaves are grayish brown. At this time, it can be applied 1.5-2 kg of zinc sulfate or foliar spray with 0.2-0.3% zinc sulfate solution, which can be sprayed 3 times, every interval of 5-6 days.
The leaves of the old molybdenum-deficient leaves are chlorotic and yellow, and the leaves are scorched inward and curled, and the kernels shrink. Foliar spray can be carried out with 0.15-0.2% ammonium molybdate solution.
The leaf veins of the new iron deficiency were chlorotic and yellow, and the veins remained green and showed a stripe shape. The stems and leaf sheaths were purple-red. At this time, 0.2-0.3% ferrous sulfate solution is sprayed on the foliar surface, and it can be sprayed 3 times, every interval of 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 Mn deficiency often start from the new leaves, the young leaves turn yellow, the veins have green spots, the leaves are soft and the roots are slender and white. At this time, 0.2% manganese sulfate solution can be used for foliar spraying 2-3 times, each interval of 7-10 days.
Copper deficiency: The plant grows slowly, is short, and dies after the top dead. 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.
Zinc deficiency: young leaves in the seedling stage are light yellow and even white seedlings are produced. The middle leaves have obvious green color, and the old leaves are grayish brown. At this time, it can be applied 1.5-2 kg of zinc sulfate or foliar spray with 0.2-0.3% zinc sulfate solution, which can be sprayed 3 times, every interval of 5-6 days.
The leaves of the old molybdenum-deficient leaves are chlorotic and yellow, and the leaves are scorched inward and curled, and the kernels shrink. Foliar spray can be carried out with 0.15-0.2% ammonium molybdate solution.
The leaf veins of the new iron deficiency were chlorotic and yellow, and the veins remained green and showed a stripe shape. The stems and leaf sheaths were purple-red. At this time, 0.2-0.3% ferrous sulfate solution is sprayed on the foliar surface, and it can be sprayed 3 times, every interval of 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 Mn deficiency often start from the new leaves, the young leaves turn yellow, the veins have green spots, the leaves are soft and the roots are slender and white. At this time, 0.2% manganese sulfate solution can be used for foliar spraying 2-3 times, each interval of 7-10 days.
Copper deficiency: The plant grows slowly, is short, and dies after the top dead. 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.
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