What to do about poorly filled walnut kernels and fruit drop? Practical solutions shared
Walnut is one of our common dried fruits. In recent years, its price has been rising steadily, its market prospects look good, and planting has developed rapidly. However, in production, serious fruit drop and poorly filled kernels often occur, which hinders the development of walnuts and also dampens farmers' enthusiasm. So how should we address the phenomena of walnut fruit drop and poorly filled kernels? Let's take a look together.
1. Causes of walnut fruit drop
When female flowers of walnut fall off without swelling, it is called flower drop; when fruits fall off during development and swelling, it is called fruit drop. Generally, flower drop is more serious than fruit drop. Walnut fruit drop is divided into physiological fruit drop and fruit drop caused by pests and diseases. Physiological fruit drop is mainly caused by poor fertilization, poor development, insufficient nutrition, and similar conditions, and it is mainly concentrated within 30-40 days after flowering. Fruit drop caused by pests and diseases is caused by pests and diseases. The biggest difference between it and physiological fruit drop is that the fallen fruit has disease spots or insect holes.
2. Causes of poorly filled kernels
Poorly filled walnut kernels are also a common new type. The main reason is insufficient nutrient accumulation in the kernels. Improper fertilization, long periods of rainy weather, and pest damage are all reasons for insufficient nutrient accumulation, and all of them may cause poorly filled kernels.
3. Solutions for fruit drop
For physiological fruit drop, improving the quality of female flowers, raising the tree's nutrient level, and adopting measures such as artificial pollination, artificial male flower thinning, and foliar fertilizer spraying can reduce fruit drop. Artificial pollination can significantly improve pollination quality. On sunny days, collect pollen from male flowers, put it into a glass bottle, and store it in a refrigerator for later use. When female flowers open, pollination can be carried out. Mix the refrigerated pollen with water, 10% sucrose, and 0.02% ammonium borate at a ratio of 1:500 to make a suspension, and spray it with a sprayer. When flower buds swell, manually remove male flower buds, which can also be combined with pruning. During the full flowering period of female flowers, spraying 0.02% boric acid + 0.3% urea + 0.3% potassium dihydrogen phosphate can increase the fruit-setting rate and promote the development of young fruits. For fruit drop caused by pests and diseases, pest and disease control work should be strengthened, which can greatly reduce fruit drop caused by pests and diseases.
4. Solutions for poorly filled kernels
To solve the problem of poorly filled kernels, first of all, pest and disease control work should be done well to ensure tree health, improve photosynthetic efficiency, and greatly increase kernel plumpness. At the same time, fertilization should be reasonable to maintain the nutrients needed by the plant. Fertilization should be carried out multiple times a year, especially during the flowering and fruiting periods. From the perspective of fruit development, to improve kernel plumpness, it is necessary to grasp the period of kernel nutrient accumulation from July to August, and secondly from June to July. From April to August, during periods with more rain, high humidity, and low light, the high-temperature and high-humidity environment very easily leads to serious pests and diseases, vigorous vegetative growth, and insufficient nutrient accumulation, seriously affecting fruit quality. More farmyard manure and phosphorus and potassium fertilizers should be applied, nitrogen fertilizer application should be appropriately controlled, and the October fruit-harvest fertilizer should be heavily applied.
The above is an introduction to solutions for poorly filled walnut kernels and fruit drop. We hope it can help you. If you want to learn more related knowledge, please follow us.