Symptoms and remedial measures of vegetable nutrient deficiency in Greenhouse

For the farmers of greenhouse vegetables, sometimes they will pay less attention to the deficiency of vegetable nutrients. Planting vegetables in the shed year after year will make the soil nutrient elements in the shed unable to meet the needs of the growth and development of vegetables, affect the yield and quality of vegetables and lead to the occurrence of vegetable nutrient deficiency. It directly affects the economic benefits of the shed. The symptoms and remedial measures of vegetable nutrient deficiency are as follows:

1. Nitrogen deficiency: the symptom is that the plant is short, the color of the leaves becomes light or red, and some of the leaves turn yellow; the color of the stems often changes, and develops rapidly. After drying, they are brown, and the stems are short and thin. Remedial measures: in case of nitrogen deficiency, quick acting nitrogen fertilizer, such as ammonium sulfate and urea, shall be applied in time, but ammonium carbide is generally not used in the shed.

2. Phosphorus deficiency: the plant grows slowly, the leaves become small but green, even the leaves become dark, and the stems become thin. Remedial measures: apply 50-100kg / mu superphosphate as base fertilizer, or spray 0.3-0.5% potassium dihydrogen phosphate solution on the leaf surface during the growth process.

3. Potassium deficiency: the leaves are light gray green, the leaf margin is yellow and dry, and the stems are thin and hard. Remedial measures: immediately apply quick acting fertilizer, such as potassium sulfate, or spray 0.3-0.5% potassium dihydrogen phosphate solution on the leaves.

4. Magnesium deficiency: the old leaves lose green and turn yellow, while the veins are still green, the leaves become brittle, the edge of the leaves is curled up, sometimes the leaves appear purple red. Remedial measures: spray 0.5% magnesium sulfate solution on the leaves in time after discovery.

5. Boron deficiency: the growth point is atrophic, brown and dry, the plant type is clumped, the leaves are bent, and the symptoms of leaf burning are produced. Control method: 0.5kg borax is applied as base fertilizer per mu, and 0.1-0.2% boric acid can also be sprayed on the leaves.

6. Copper deficiency: the young leaves show atrophy, the plant growth is weak, the leaf color changes, and the leaf tip turns white. Remedial measures: spraying 0.05% copper sulfate solution on the leaves, in addition, applying more organic fertilizer can also prevent the occurrence of copper deficiency.

7. Lack of manganese: the young leaves are necrotic, the veins are still green, and the later leaves are deciduous. Control measures: try to keep the soil neutral, apply 1-4kg of manganese sulfate per mu as the base fertilizer, or apply 0.2% manganese sulfate outside the root.

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