Cucumber Papaya Symptoms:
Pomegranate, also known as physiological fruit drop or abortion, refers to the phenomenon where female flowers fail to develop into mature fruits. Instead, they gradually turn yellow, wither, and fall off. These affected flowers or young fruits are commonly referred to as "physiological wilting fruits." This condition is a widespread issue in cucumber cultivation, especially in protected environments like greenhouses. If not properly managed, the fruit drop rate can exceed 50%, significantly impacting yield and profitability.
Cause Analysis:
This problem typically arises due to insufficient nutrient supply or competition between different plant organs for resources. Under adverse conditions such as low temperature and low light, many modern cucumber varieties produce more flowers than they can support. Within limits, this is a natural self-regulation mechanism of the plant. However, when the number of abnormal fruits becomes excessive, it indicates a serious physiological disorder.
Control Methods:
1. **Pollination Assistance**: For varieties with weak parthenocarpy, artificial pollination using bees or hand-pollination can be effective. This helps stimulate ovary development and reduces the occurrence of fruit drop by about 70%.
2. **Enhanced Lighting**: Even on cloudy days, if outdoor temperatures are above -20°C, open the greenhouse curtains briefly around noon to allow plants to receive scattered sunlight. Installing infrared lamps can further supplement both light and heat.
3. **Foliar Sprays and Hormone Treatments**: A mixture of 1% potassium dihydrogen phosphate, 0.4% glucose, and 0.4% urea, combined with 15.5 mg/L of Guagua Ling, has proven effective. Additionally, spraying 100 mg/kg gibberellin can promote fruit development. Other options include using female garcinia flowers or commercial sprays, following manufacturer instructions.
4. **Temperature Management**: In late winter and spring, maintain daytime temperatures between 23–25°C (no higher than 28°C) and nighttime temperatures at 10–12°C. Ensure proper ventilation to avoid overheating. During colder periods, increase greenhouse temperatures, especially soil temperature. The minimum soil temperature should not drop below 10°C; ideally, it should stay above 14°C. To improve ground temperature, farmers can bury corn stalks between rows, which decompose and release heat—this technique has shown excellent results in field trials.
5. **Balancing Vegetative and Reproductive Growth**: Over-harvesting or delayed picking can lead to imbalances, causing fruit drop. Proper water and fertilizer management, along with timely harvesting, is essential. Ensure that at least one vigorous fruit remains on the plant during each harvest. If nutrient levels are low, increase irrigation and fertilization accordingly.
By implementing these strategies, growers can significantly reduce fruit drop and improve overall yield and quality in their cucumber crops.
Glacier Beer 330ml,Refreshing Glacier for a Road Trip,Premium Glacier for Dinner,Smooth Glacier for Game Night
Yanbian Baichuan Import and Export Trade Co., LTD , https://www.baichuanbeer.com