In Xujia Village, Weicheng District, Weifang City, a local vegetable farmer asked: "Last year's bell peppers didn't bear fruit. What should we pay attention to when planting them this year?"
The issue of sweet peppers not setting fruit is often linked to poor management and the development of "empty" plants. This condition typically occurs due to improper handling during the seedling stage. First, the seedling period usually lasts 6 to 7 days. During this time, the greenhouse should be sealed without ventilation, with temperatures maintained between 30°C and 35°C. Nighttime heating is essential to prevent frost and promote healthy growth. However, if the seedlings are left too long in this high-temperature, high-humidity environment, the plants may enter a "false living" state, where they grow weak and unproductive.
Second, inadequate ventilation after the seedlings have been hardened off can worsen the problem. If ventilation is delayed, the temperature inside the greenhouse remains high, increasing soil and plant transpiration. Relative humidity can exceed 60%, leading to excessive moisture buildup. This creates an unfavorable environment for fruit setting, causing the plants to become leggy and further worsening the situation. This cycle ultimately results in the formation of "empty" plants that fail to produce fruit.
To prevent this, once the seedlings have acclimated, it's important to ventilate thoroughly while maintaining an appropriate temperature. In the early stages, keep the greenhouse temperature between 28°C and 30°C, then gradually lower it as the plants grow. By the time the peppers begin to set fruit, the temperature should be around 20°C to 25°C. This helps the plants develop strong, compact growth with short internodes, which is ideal for fruit setting.
Proper watering and fertilization are also crucial. Small bell pepper leaves don’t transpire much, so water should be applied carefully. Overwatering during the early growth phase can lead to flower and fruit drop. Watering should be limited until the plants start producing fruit. Once the first batch of peppers begins to mature, increase irrigation and apply organic manure along with additional phosphorus and potassium to boost yield and improve fruit quality.
By following these practices, farmers can significantly improve the success rate of their bell pepper crops and avoid the problem of "empty" plants.
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