1. There are three main reasons for falling flowers: 1 Bad flower bud differentiation. Flower bud differentiation temperature is too low, poor lighting conditions, sub-shooting roots and other undesirable environments can lead to flower bud differentiation is not normal and fall; 2 environmental factors cause pollination, poor fertilization, flowering in case of low temperatures, especially at night temperatures below 12 °C The pollen tube does not grow normally, which can easily lead to abnormal fertilization and flowering. High temperature during flowering, especially when the night temperature is higher than 22°C, can also cause poor elongation of the pollen tube, resulting in abnormal fertilization. Soil drought, air humidity is too small or too large, will affect the pollen germination, resulting in abnormal fertilization and falling; 3 Malnutrition. Overcast days of flowering, lack of light, excessive growth of nutrients, etc. will all lead to falling flowers. In addition, the high temperature and drought in the summer, high temperature and rain, and strong sunlight all cause poor nutrition and flowering. Pest damage is also one of the important reasons for falling flowers.
2. After the fruit is set, the fruit is continuously cloudy and rainy. The lack of light, low temperature and premature watering cause the plants to grow too vegetatively, grow in length, or the soil is too dry and lack of water. Partial application of nitrogen fertilizer or insufficient fertilizer will cause imbalance in nutrient supply. Dropping fruit, pest damage is also an important reason for fruit drop.
3, prevention and control of falling flowers, fruit drop from the beginning of the seedling period, the seedlings should provide a good period of growth conditions, especially pay attention to temperature, light and transplanting seedling time, can not be separated into seedlings too early or too late, do not enter the flower bud differentiation period When downing. Flowering period should be reasonable fertilization, watering, according to the soil temperature conditions, generally in the first ear fruit when the walnut is large, start the first watering of the result period; keep the plastic film clean, ensure adequate lighting, control day and night temperature, keep the day 25 -28°C, no lower than 1～5°C at night; apply flower buds or pedicels newly opened with 20ppm 2.4-D at flowering stage, flowers are only wiped once or coated with 20-30ppm tomato or half open in inflorescence Spraying flowers on time can effectively prevent flowering and fruit falling.
2. After the fruit is set, the fruit is continuously cloudy and rainy. The lack of light, low temperature and premature watering cause the plants to grow too vegetatively, grow in length, or the soil is too dry and lack of water. Partial application of nitrogen fertilizer or insufficient fertilizer will cause imbalance in nutrient supply. Dropping fruit, pest damage is also an important reason for fruit drop.
3, prevention and control of falling flowers, fruit drop from the beginning of the seedling period, the seedlings should provide a good period of growth conditions, especially pay attention to temperature, light and transplanting seedling time, can not be separated into seedlings too early or too late, do not enter the flower bud differentiation period When downing. Flowering period should be reasonable fertilization, watering, according to the soil temperature conditions, generally in the first ear fruit when the walnut is large, start the first watering of the result period; keep the plastic film clean, ensure adequate lighting, control day and night temperature, keep the day 25 -28°C, no lower than 1～5°C at night; apply flower buds or pedicels newly opened with 20ppm 2.4-D at flowering stage, flowers are only wiped once or coated with 20-30ppm tomato or half open in inflorescence Spraying flowers on time can effectively prevent flowering and fruit falling.
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