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.
1. Zinc deficiency. At the seedling stage, the young leaves were light yellow and even white seedlings were produced. The middle leaves had obvious green stripes, and the old leaves were grayish brown. At this time, it can be applied 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 interval of 5-6 days.
2. Molybdenum deficiency. The leaves of the old leaves are chlorotic and yellow, and the leaves are curled inward and curled, and the kernels shrink. At this time, foliar spraying can be carried out using 0.15%-0.2% ammonium molybdate solution.
3. Iron deficiency. The leaves 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, 0.2%--0.3% of ferrous sulfate solution is sprayed on the leaves, and it can be sprayed 3 times, every interval of 5-7 days.
4. Boron deficiency. Young leaves can not be opened and whitish, gradually withering and dying. There are white stripes between the leaves of the old leaves, and the plants are short and thin. At this time, 85 grams of borax or 50-60 grams of boric acid can be used in acre, and 60 kg of water can be sprayed on the foliar surface, which can be sprayed 3 times, every interval of 5-7 days.
5. Manganese deficiency. Symptoms 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 is 7-10 days.
6. Copper deficiency. The plants grow slowly, are short, and form a cluster after the top dead. The leaves are grayish yellow or reddish 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.
Huaxian County Soil and Fertilizer Station
1. Zinc deficiency. At the seedling stage, the young leaves were light yellow and even white seedlings were produced. The middle leaves had obvious green stripes, and the old leaves were grayish brown. At this time, it can be applied 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 interval of 5-6 days.
2. Molybdenum deficiency. The leaves of the old leaves are chlorotic and yellow, and the leaves are curled inward and curled, and the kernels shrink. At this time, foliar spraying can be carried out using 0.15%-0.2% ammonium molybdate solution.
3. Iron deficiency. The leaves 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, 0.2%--0.3% of ferrous sulfate solution is sprayed on the leaves, and it can be sprayed 3 times, every interval of 5-7 days.
4. Boron deficiency. Young leaves can not be opened and whitish, gradually withering and dying. There are white stripes between the leaves of the old leaves, and the plants are short and thin. At this time, 85 grams of borax or 50-60 grams of boric acid can be used in acre, and 60 kg of water can be sprayed on the foliar surface, which can be sprayed 3 times, every interval of 5-7 days.
5. Manganese deficiency. Symptoms 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 is 7-10 days.
6. Copper deficiency. The plants grow slowly, are short, and form a cluster after the top dead. The leaves are grayish yellow or reddish 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.
Huaxian County Soil and Fertilizer Station
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