Nine and October Persimmons Prevent Falling Fruit
Persimmons are harvested from flowering to ripening, and physiological fruiting falls roughly twice.
Pre-fall fruiting occurs from flowering to early July. Among them, the fruit drop is highest in June and mid-June, accounting for about 80% of the total fruit drop. The fruit drop in the later period is from mid-August to before harvest. Reasons for the late fruit-dropping: Late fruit-dropping is related to nutritional conditions, and some varieties have serious fruit drop in the late period when they are undernutrition. In addition, although some varieties are not easy to drop in the later stages, if the summer drought occurs, the fruit will stop developing. After the end of August, the fruit will enter the second rapid expansion period. If continuous rainfall then, the root system will grow rapidly, both fruit and root. To compete for nutrients, but also because of continuous rain, lack of sunshine, poor photosynthesis, fruit organic nutrients will reduce fruit loss. In addition, there are too many fruits on the persimmon tree, which results in a large number of fruits because of insufficient nutrition.
Prevention and control measures: 1 Strengthen the management of fertilizer and water, and the fertilizer and water can meet the nutrient and water requirements of the quinoa vegetative growth and results, and can also regulate the nutrient and water requirements for growth and results. Therefore, it is necessary to timely irrigation in a very dry period, to maintain the fruit growth required water, and in the occurrence of physiological fruit drop persimmon trees, topdressing potassium fertilizer, control the amount of nitrogen fertilizer, promote fruit hypertrophy, prevent shoots prolong growth, reduce late fruit drop . 2 By adjusting the tree vigor by trimming, the big single tree has a large amount of flowers and flowers, consumes much nutrients, and has small organic accumulation and weak growth. Therefore, pruning the big single tree, sparse the result of too dense branches and the resulting mother branches, a short part of the results of the mother branch, appropriate control of fruit and fruit retention, reduce nutrient consumption, the large single tree to be sparse , increase nutrient accumulation, reduce the September-October persimmon fruit drop.
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