The expansion period is the late stage of fruit tree fruit growth. Fruit development and flower bud differentiation are carried out simultaneously. It requires a lot of carbohydrates and water, which is the “critical period†of water, and the suitable soil relative humidity is 70%. If the water is insufficient, the head of the fruit will not grow; if there is too much water, it will cause the new shoots to grow, the canopy will be seriously shielded, and the coloration of the fruit will be affected in the later stage. The soil too wet will also affect the root growth.
1. Take effective measures to prevent wind and reduce fruit loss. After the rain, timely draining and cultivating to prevent wet damage, so as not to cause long shoots, large canopy closure, poor ventilation and light, affecting fruit enlargement. Insufficient illumination in rainy weather also affects flower bud differentiation and will increase pests and diseases.
2. Orchards in hilly areas have poor soil water retention capacity. Like Red Fuji fruit trees, their ability to resist drought and suffocation is very weak. Pay attention to water management.
3. Reasonable summer pruning, the degree of pruning should be light, and the new shoots and straight branches should be improved to improve the ventilation and light transmission conditions, prevent the soil moisture from being too large, and also help to control the tree potential and promote the ripening of branches and flower bud differentiation.
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