What to Do About Premature Senescence in Greenhouse Vegetables? 7 Prevention Tips Worth Saving for Vegetable Growers

The rise of greenhouse vegetables lets consumers enjoy many off-season vegetables and allows vegetable growers to boost their economic returns, but if greenhouse vegetables are not managed properly in the mid-to-late growth stage, premature senescence often occurs, reducing yield and lowering quality. So what should be done about premature senescence in greenhouse vegetables? These 7 tips work best when used early, and vegetable growers are advised to save them!

What to Do About Premature Senescence in Greenhouse Vegetables

1. Crop rotation: Carry out crop rotation for more than 3 years, aim for a different crop each season, and keep the soil structure stable.

2. Balanced fertilization: Fertilization must be applied rationally according to the nutrient requirements of each vegetable, to avoid damaging the vegetable roots due to excessive chemical fertilizer application, which can lead to premature senescence of the plants. For topdressing, generally apply 15-20 kg of compound fertilizer per mu, together with 30-40 kg of biological fertilizer, and also pay attention to the combined use of foliar fertilizer.

3. Proper watering: Watering should be done in the morning on fine days, ensuring 2-3 sunny days after watering. After watering, raise the temperature first and then ventilate, to avoid root damage from excessively low soil temperature that causes premature senescence. In addition, note that the amount of water each time should not be too large, to prevent root rot.

4. Keep the leaves: Some vegetable growers, in the late growth stage of cucumbers, remove leaves too aggressively and lower the vines too much in order to save effort, which is incorrect. If the number of leaves on the plant is too small, fewer photosynthetic products are produced, often causing deformed fruit and weak growth. It is recommended to keep at least 12 functional leaves on each cucumber plant and to control the number of fruits retained.

5. Control temperature and humidity: In the late growth stage of vegetables, pay attention to controlling air humidity to avoid a large outbreak of diseases, which also helps the fruit ripen earlier. For greenhouses severely affected by cold damage, remove young fruit in time to ensure the nutrients needed for plant growth and prevent premature senescence caused by low temperature and weak light.

6. Use growth regulators: Time the use of flower-dipping agents properly. Generally, dip or smear the flower stalk when the flower is half-open or fully open, and never dip the flower repeatedly. Note that when using 4-CPA (anti-drop agent) or Tomatotone to dip or spray flowers, it must not be sprayed on the vegetable leaves.

7. Prevent and control pests and diseases: Spray pesticides early to prevent pests and diseases, but note that spraying must be scientific and rational. Never spray too frequently or at too high a concentration, to avoid pesticide damage and worsening the premature senescence of vegetables.

The above are the 7 methods to prevent premature senescence in greenhouse vegetables. Vegetable growers can refer to and practice them according to their own situation, focusing on the key points.