Rain weather control Shatang Tang cracked fruit

Citrus fruit cracking reasons: First, the differences between varieties, in the same orchard, different varieties of fruit cracking situation is different, uneven thickness of the skin, especially the thin top of the fruit species the most vulnerable to cracking fruit (such as shatang Tang); Caused by drought, sudden rainfall or irrigation after long drought is the main precipitating factor. In the prolonged drought of citrus fruit, the peel of the fruit shrinks and grows slowly. The rain absorbs much water and grows rapidly. The growth of the pericarp has not yet fully recovered, and the growth rate is slower than that of the flesh, resulting in the peel being cracked by the bulge of the flesh. Open, produce mechanical cracks. Third, the impact of soil moisture, such as long-term rain weather, soil moisture is often saturated, causing new roots to suffocate and death, when the rain stopped suddenly causing cracks, soil water in the previous period can aggravate the occurrence of cracking.
Prevention methods are as follows:
First, maintaining a high and moderate moisture content in the soil will not drastically change the water supply of citrus. In times of drought, water should be promptly irrigated. Generally, there is no rain for two consecutive months. Water and drought should be poured once. In the hot and dry season, it is required to be irrigated once every 10 days. Tree trays cover the grass to increase coverage and prevent evaporation of soil moisture. When it is time, it should be drained in time, and after the heavy rain, shallow cultivator will be carried out.
Second, increase the application of phosphorus and potassium fertilizers, and apply leaf fertilizer. At the end of July or mid-August, 50-70 kilograms of human and animal manure water per plant was applied, 0.3 kg of urea was added, and 0.2 kg of potassium chloride was used. After the fertilization, soil and irrigation were promptly applied. For mangoes that have too many fruit set, nitrogen fertilizer should be added to increase the thickness of the peel. During dry period, different types of foliar fertilizers are alternately sprayed every 7-10 days, such as spraying Guoguang triacontanol and urea at the beginning of drought, followed by application of potassium dihydrogen phosphate and Guoguang amino acid potassium, and the stable high temperature during the dry period. At the stage, with the liquid leaching solution, spraying foliar fertilizer with ammonium molybdate for 48-52 days before picking, such as Guoguang amino acid molybdenum, “Hongtian”, etc., can both reduce cracking and promote fruit enlargement.

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