First, the reasons for walnut fruit drop 1, improper selection of varieties. 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 of the same sex. When constructing a garden, it is best to use 2-4 male or female flowering plants with similar or complementary cultivars, or appropriate pollination varieties. The proportion of main cultivars and pollination cultivars is 4:1. The main cultivars can be selected from Xiangling, Liaohe Nuclear No. 4, Yuanfeng, Fenghui and others. 2. Rainfall or low temperatures during the flowering period cause 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, lack of 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 fertilizer, strong tree vigor. Generally should be in the fall and spring fertilizer, once per acre should be applied to 1,000 to 1,500 kilograms of soil miscellaneous fertilizer. According to the age of walnut trees, each tree should be topped with no-tillage fertilizer or common NPK fertilizers of 1 to 1.5 kg. Before and after flowering, the leaves were sprayed 1-2 times with 4,000 times liquid Shuofeng 481 plus 1000-1500 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, to strengthen prevention and treatment of anthrax. In order to prevent rotten fruit or fruit drop caused by anthrax, spray 400-600 times liquid Bangjiawei (80% mancozeb) and add 4000 times liquid Shuofeng 481 to prevent it. HiFent nasal high flow, provide higher flow rate than conventional oxygen treatment during high flow oxygen therapy and process, ideal solution for offering FiO2 that can be manual titration controled, mixed gas with controlled temperature and humidity, so as to achieve better airway management and raise the level of oxygenation. Heated Nasal Cannula,Home High Flow Oxygen,Copd High Flow Oxygen,Oxygen Rate Nasal Cannula Shenyang RMS MEDICAL TECH CO.,LTD , https://www.medicalrms.com