Latest Solutions for Poorly Filled Walnut Kernels and Fruit Drop

Walnut is one of our common dried fruits. In recent years, its price has been rising continuously, the market prospects are favorable all the way, 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 us learn about it together.

1. Causes of walnut fruit drop

When walnut female flowers fall off without swelling, it is called flower drop; when the fruit falls 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 other conditions, and 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 dropped fruit has disease spots or insect holes.

2. Causes of poorly filled kernels

Poorly filled walnut kernels are also a common new phenomenon. The main reason is insufficient nutrient accumulation in the kernels. Improper fertilization or long periods of rainy weather and pest damage are all reasons for insufficient nutrient accumulation, and all may cause the kernels to be poorly filled.

3. Solutions for fruit drop

For physiological fruit drop, improving the quality of female flowers, raising the tree's nutritional 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 refrigerate it 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 the flower buds swell, manually remove the male flower buds, which can also be done in combination with pruning. During the full blooming 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 do a good job in pest and disease control, ensure tree health, improve photosynthetic efficiency, and greatly increase kernel plumpness. At the same time, fertilize rationally and maintain the nutrients needed by the plant. Fertilization should be carried out multiple times a year, especially during the flowering and fruiting period. From the perspective of fruit development, to improve kernel plumpness, it is necessary to seize the period from July to August when kernel nutrients accumulate, followed by June to July. From April to August, during the period with more rain, high humidity, and low light, the high-temperature and high-humidity environment can easily lead to serious pests and diseases, vigorous vegetative growth, and insufficient nutrient accumulation, seriously affecting fruit quality. Increase the application of farmyard manure and phosphorus and potassium fertilizers, appropriately control nitrogen fertilizer application, and heavily apply the fruit-picking fertilizer in October.

The above is an introduction to solutions for poorly filled walnut kernels and fruit drop. We hope it can help you. To learn more related knowledge, please stay tuned to us.