1. Nitrogen deficiency: When the vegetable seedlings lack nitrogen deficiency, the seedlings grow weak, the stems are short and thin, the leaves are small, the two cotyledons first turn yellow, and continue to develop upwards. Finally, the whole plant is yellow or brown, and when it is severe, it is dead; root vegetables Does not inflate; the ball is not easy to stand or bad. Remedial measures: 7.5 to 10 kg of urea per acre, or use human excrement plus an appropriate amount of urea to water, or spray 0.5-1% urea solution on the foliage.
2. Phosphorus deficiency: The plants are short, the leaves are small, the leaves are dark green, the lower leaves become purple or reddish brown; the lateral roots are poorly grown, the roots of the roots are not swollen; the fruit vegetables delay or the fruit maturity is delayed. Remedy: Use 0.5 kg of calcium phosphate per acre for 24 hours with water, add 50 kg of water after filtration, and spray the leaves with 0.5 kg of urea, and spray twice. Or acre with potassium dihydrogen phosphate 100-150 grams plus 50 kg of water spray.
3. Potassium deficiency: The symptoms of potassium deficiency in seedlings at seedling stage are not obvious. At the seedling stage, symptoms appear on the leaves of the old age. The tip and leaf margin of the old leaves turn yellow or turn brown, and there are spots of tissue necrosis along the veins. The plants have poor cold resistance and drought resistance, and are easy to fall. Leafy vegetables show symptoms at the beginning of growth; root vegetables show symptoms when they are inflated; ball-like plants show symptoms at the beginning of the ball, and the leaves shrink and the hands feel hard; the fruits and vegetables are not in the early stage of growth. Deficiency of performance, when the fruit is swollen, symptoms appear on the old leaves. Remedy: 5-8 kg of potassium chloride or 75-100 kg of grass ash per mu can also be sprayed with 1% potassium chloride solution or 3-5% grass ash.
2. Phosphorus deficiency: The plants are short, the leaves are small, the leaves are dark green, the lower leaves become purple or reddish brown; the lateral roots are poorly grown, the roots of the roots are not swollen; the fruit vegetables delay or the fruit maturity is delayed. Remedy: Use 0.5 kg of calcium phosphate per acre for 24 hours with water, add 50 kg of water after filtration, and spray the leaves with 0.5 kg of urea, and spray twice. Or acre with potassium dihydrogen phosphate 100-150 grams plus 50 kg of water spray.
3. Potassium deficiency: The symptoms of potassium deficiency in seedlings at seedling stage are not obvious. At the seedling stage, symptoms appear on the leaves of the old age. The tip and leaf margin of the old leaves turn yellow or turn brown, and there are spots of tissue necrosis along the veins. The plants have poor cold resistance and drought resistance, and are easy to fall. Leafy vegetables show symptoms at the beginning of growth; root vegetables show symptoms when they are inflated; ball-like plants show symptoms at the beginning of the ball, and the leaves shrink and the hands feel hard; the fruits and vegetables are not in the early stage of growth. Deficiency of performance, when the fruit is swollen, symptoms appear on the old leaves. Remedy: 5-8 kg of potassium chloride or 75-100 kg of grass ash per mu can also be sprayed with 1% potassium chloride solution or 3-5% grass ash.
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