What to do about stiff fruit appearing after flowering in greenhouse nectarines

The solution to stiff fruit after flowering in greenhouse nectarines is to strengthen fertilizer and water management, ensure the tree has sufficient nutrients, control the temperature and humidity inside the greenhouse, and prevent and control pests and diseases. It is mainly caused by weak tree vigor, poor water and fertilizer conditions, poor nutrition before flowering, and poorly developed flower buds. During this period, the following points should be focused on:

1. Strengthen fertilizer and water management to ensure the tree has sufficient nutrients. In the early stage, focus on NP; in the later stage, focus on PK. After topdressing, combine with intertillage and water lightly. If the tree vigor is weak, apply an appropriate amount of water-soluble fertilizer along with watering.

2. Control the temperature and humidity inside the greenhouse well, and give the tree the most suitable growing environment. Requirements during the fruit enlargement period after flowering: temperature 8°C-26°C; during the pit-hardening stage, temperature 10°C-28°C; in the 3 weeks before harvest, 15°C-30°C. Humidity after flowering should not exceed 60%.

3. Prevent and control pests and diseases to improve fruit quality. Greenhouse nectarines grow in a microclimate environment. If pests and diseases were well controlled last year, there will generally be few pests and diseases this year. Pest and disease control should focus on prevention. For fungicides, choose 80% Daconil M-45 at 800 times dilution, or 50% carbendazim, or Bordeaux mixture. For insecticides, choose: diflubenzuron, imidacloprid, fenitrothion.