We all know that walnuts are not very strict with respect to environmental conditions for growth, and are also relatively tolerant to droughts. However, if management techniques are not well-controlled, they are prone to fruit-dropping, which leads to a reduction in yields and a direct impact on the harvest of fruit growers. Planting enthusiasm. Therefore, the reasons for the walnut fruit drop and solutions are summarized as follows:
First, the reasons for walnut fruit drop
1. The type is not properly selected. Select varieties should be adapted to local conditions, select the varieties suitable for the local climate and soil conditions. Generally, thin shell varieties with strong growth, strong stress resistance, high quality and high yield should be selected. Walnut is a dioecious plant with different sexes. When constructing a garden, it is best to select 2 to 4 main cultivars with similar or complementary male and female flowering stages, or configure suitable pollination varieties. The proportion of main cultivars and pollination cultivars is 4:1. The main cultivars can choose Xiangling, Liaohe No. 4, Yuanfeng, Fenghui and so on.
2. Rainfall or low temperatures during flowering, resulting in poor pollination. The unfertilized young fruit usually has fruit drop after 20 days of flowering, which is one of the main reasons causing the walnut fruit to drop heavily.
3. Insufficient nutrients. Many people think that walnuts can produce less if they do not even top-dressing fertilizers. Due to the shortage of fertilizers, the consumption of nutrients at the flowering stage is relatively large, resulting in nutrient deficits and weak tree vigor resulting in fruit drop.
4. The lack of trace elements. When the walnut orchard lacks boron, lacks zinc, and lacks copper, it is also prone to fruit drop.
5. Use too much nitrogen fertilizer or partial nitrogen fertilizer. The use of too much nitrogen fertilizer or partial application of nitrogen fertilizer will result in excessive tree vigor and lead to loss of balance between vegetative growth and physiological growth, resulting in falling flowers and falling fruit.
6. Drops caused by pests and diseases. The main disease of walnut is anthrax, which mainly damages the fruit and directly causes the fruit to rot, causing fruit drop.
Second, the prevention and treatment of walnut fruit drop
1. Timely top dressing, strong tree vigor. Generally should be in the fall and spring fertilizers once again, each acre should be applied to 1,000 to 1500 kg of soil miscellaneous fertilizer. According to the age of the walnuts, each tree should also be topdressed with no-tillage or 1–1.5 kg of NPK. Before and after flowering, the leaves were sprayed with 1 to 2 times 4000 times liquid Shuofeng 481 plus 1000 to 1500 times liquid available boron. After the use of available boron, it can effectively prevent the buds caused by lack of boron in the walnut tree without flowers, flowers, not real, bad, fruit drop, fruit malformation and other undesirable phenomena.
2. Strengthen prevention and treatment of anthrax. To prevent rotten fruit or fruit drop caused by anthrax, spray 400-600 times of Bungarwee (80% mancozeb) each time in the middle of May, early June and early July, and increase 4000 times Shuofeng 481 to prevent.
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