Sweet pepper deficiency
Disease symptoms: Nitrogen deficiency: The leaf area is small, the flowering position is increased, the leaves are thin and yellow, and the yellowing phenomenon is expanded from the lower leaf to the upper leaf. Phosphorus deficiency: The initial plant growth was slow, but there was no yellowing. Deficiency of potassium: The leaves are dark green with some necrosis on the leaf margins, browning between veins, and severe yellowing of the lower leaves. Calcium deficiency: Apical leaf growth is poor, leaf tip is yellow, and some leaves show raised ribs. Umbilical rot appeared on the fruit. Calcium deficiency: Mainly manifested in the chlorosis between the old leaves of the lower leaves is the main symptoms. Boron deficiency: The growth and development of the upper part of the plant is stopped. The petiole and vein hardening are easily broken, and the leaves are distorted or the buds fall off. Magnesium deficiency: There is chlorosis between leaves and veins, and often variegated spots on leaves. The leaf margin remains green. Pathogenesis: Phosphorus deficiency: Phosphorus deficiency is prone to occur in soils with acidity and soil compaction. Long-term hypothermia seriously affects the absorption of phosphorus. Therefore, phosphorus production may be low due to low temperature. Potassium deficiency: Low potassium content in the soil or insufficient supply of potassium or use of lime fertilizer affects the absorption of potassium, and potassium deficiency often occurs. Magnesium deficiency: The continued addition of magnesium to eggplant grown on sandy soil is insufficient for the supply of magnesium to the soil, excessive use of potash fertilizer for production, low ground temperature or phosphorus deficiency may cause magnesium deficiency in eggplant. Disease classification: malnutrition Prevention measures: (1) Prevent nitrogen deficiency: 5500 kg of base fertilizer or chicken manure should be applied before planting. (2) To prevent phosphorus deficiency: Before planting 667? Applying organic fertilizer, apply phosphate fertilizer 25-35kg. (3) Preventing potassium deficiency: Apply 15–25 kg of potassium sulfate to the basal fertilizer and spread it evenly on the surface of the soil. (4) Preventing Iron Deficiency: Adjusting the acid soil to neutrality, magnesium hydroxide or lime can be used to gradually adjust and improve the conditions of multiple fertilizers and more moisture. When the soil is too wet, watering is reduced, and the water is drained immediately after the rain. (5) Prevent magnesium deficiency: Pay attention to the improvement of acidic or alkaline soil to neutrality, increase organic fertilizer and pay attention to nitrogen, phosphorus and potassium. In emergency, spray 0.15% magnesium sulfate solution. (6) Prevent manganese deficiency: Apply proper amount of manganese oxide or manganese sulfate to the basal fertilizer. In emergency, spray 0.2% manganese sulfate solution or 0.08% potassium permanganate solution. General description: Symptoms of Nitrogen Deficiency: Leaf area is small, flowering position is increased, leaf blade is thin and yellow, and yellowing phenomenon is expanded from the lower leaf to upper leaf. Phosphorus deficiency: The initial plant growth was slow, but there was no yellowing. Deficiency of potassium: The leaves are dark green with some necrosis on the leaf margins, browning between veins, and severe yellowing of the lower leaves. Calcium deficiency: Apical leaf growth is poor, leaf tip is yellow, and some leaves show raised ribs. Umbilical rot appeared on the fruit. Magnesium deficiency: Mainly manifested in the chlorosis between the old leaves and veins of the lower part is the main symptom. Boron deficiency: The growth and development of the upper part of the plant is stopped. The petiole and vein hardening are easily broken, and the leaves are distorted or the buds fall off. Magnesium deficiency: There is chlorosis between leaves and veins, and often variegated spots on leaves. The leaf margin remains green. Phenomenon deficiency Phosphorus: In the case of soil acidity and soil compaction, phosphorus deficiency disease is prone to occur; long-term hypothermia seriously affects the absorption of phosphorus, so low phosphorus production on the ground will also lead to phosphorus deficiency. Potassium deficiency: Low potassium content in the soil or insufficient supply of potassium or use of lime fertilizer affects the absorption of potassium, and potassium deficiency often occurs. Magnesium deficiency: The continued addition of magnesium to eggplant grown on sandy soil is insufficient for the supply of magnesium to the soil, excessive use of potash fertilizer for production, low ground temperature or phosphorus deficiency may cause magnesium deficiency in eggplant. Non-environmental Pollution Control Law (1) Prevention of Nitrogen Deficiency: Before planting, 5500 kg of base fertilizer or chicken manure should be applied. (2) To prevent phosphorus deficiency: Before planting 667? Applying organic fertilizer, apply phosphate fertilizer 25-35kg. (3) Preventing potassium deficiency: Apply 15–25 kg of potassium sulfate to the basal fertilizer and spread it evenly on the surface of the soil. (4) Preventing Iron Deficiency: Adjusting the acid soil to neutrality, magnesium hydroxide or lime can be used to gradually adjust and improve the conditions of multiple fertilizers and more moisture. When the soil is too wet, watering is reduced, and the water is drained immediately after the rain. (5) Prevent magnesium deficiency: Pay attention to the improvement of acidic or alkaline soil to neutrality, increase organic fertilizer and pay attention to nitrogen, phosphorus and potassium. In emergency, spray 0.15% magnesium sulfate solution. (6) Prevent manganese deficiency: Apply proper amount of manganese oxide or manganese sulfate to the basal fertilizer. In emergency, spray 0.2% manganese sulfate solution or 0.08% potassium permanganate solution.
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