Common Greenhouse Vegetable Nutrient Deficiencies and Their Remedies
For friends who grow greenhouse vegetables, sometimes the nutrient deficiency of vegetables is taken lightly. Here I would like to remind everyone that because of the continuous planting of vegetables in the greenhouse, the soil nutrient elements will be reduced or even unable to meet the needs of vegetable growth and development, affecting the yield and quality of vegetables, resulting in vegetable nutrient deficiency, which may directly affect the greenhouse. The overall economic benefits of planting. The symptoms and remedial measures of common shed vegetable nutrient deficiency are introduced as follows:
1. Nitrogen deficiency
The symptoms are short plants, pale or red leaves, and some of the leaves turn yellow; the stem color also usually changes, develops rapidly, and turns brown after drying, with short and thin stems. Remedial measures: When nitrogen deficiency is found, fast-acting nitrogen fertilizers such as ammonium sulfate and urea should be applied in time, but ammonium bicarbonate is generally not used in greenhouses.
2. Phosphorus deficiency
The plant grows slowly, the leaves become smaller but remain green, and even the leaves become darker and the stems become thinner. Remedial measures: apply superphosphate 50-100 kg/mu as base fertilizer; or spray 0.3-0.5% potassium dihydrogen phosphate solution on leaves during growth.
3. Potassium deficiency
The leaves are light gray-green, the leaf margins turn yellow and dry, and the stems are thin and hard. Remedial measures: Immediately topdress quick-acting fertilizers, such as potassium sulfate, etc., or spray 0.3-0.5% potassium dihydrogen phosphate solution on the leaves.
4. Magnesium deficiency
Old leaves lose chlorosis and turn yellow, but the veins are still green, the leaves become brittle, the leaf margins roll up, and sometimes the leaves appear purple. Remedial measures: Spray 0.5% magnesium sulfate solution on leaves in time after discovery.
5. Boron deficiency
The growth point shrinks, browns and dries up, the plant type is tufted, and the leaves are bent, resulting in leaf burn symptoms. Control method: apply 0.5 kg of borax per mu as base fertilizer, or spray 0.1-0.2% boric acid on the leaves.
6. Copper deficiency
The young leaves are shrunken, the plant growth is weak, the leaf color changes, and the leaf tips turn white. Remedial measures: Spray 0.05% copper sulfate solution on the leaves. In addition, applying more organic fertilizers can also prevent the occurrence of copper deficiency.
7. Manganese deficiency
The mesophyll of the young leaves is necrotic, the veins remain green, and the leaves fall later. Control measures: try to keep the soil neutral, apply 1-4 kg of manganese sulfate per mu as base fertilizer, and topdress 0.2% manganese sulfate outside the roots.
8. Iron deficiency
The young leaves show chlorosis between the veins and are yellowish-white, and when severe, the whole leaves turn yellowish-white and dry. Remedial measures: spray 0.1-0.2% ferrous sulfate solution on the leaves
