Red meat honey grapefruit calcium deficiency prevention and control measures

In the orchards of acid soils in the south, calcium deficiency disease occurs to varying degrees every year, which is one of the main causes of the degeneration of the fruit trees. In general, the diseased plants showed early yellowing, slow greening, and thin, unlustrous leaves. They were slightly wilted at high temperatures during the noon hours of the sunny day. As the leaves were aging, yellow spots were developed from the tips of leaves and leaves to the foliage, and then the main The veins and veins of the veins turn black, and the tip of the veins are dry and the leaves are shriveled. The leaves of some leaves are curled on the edge of the leaf blade or the tip of the leaf is then sagged and then dropped. The shoots stop growing early and the shoots are thin. The main prevention and control measures summarized by Jinsheng Hongxin Miyou Professional Cooperative of Pinghe County are as follows:

1. Add organic fertilizer

Every year, soil and soil deep-turning are combined with expansion points to apply 2,000 kg of organic fertilizer such as manure, animal manure, green manure, weeds, lotus root, biogas residue and cake fertilizer to activate calcium in the soil.

2. Increase calcium fertilizer

Each acre combined with autumn-winter base fertilizer mixed with or applied lime of 75-100 kg for 2-3 consecutive years, and the use of phosphorus species of superphosphate is calcium, magnesium, and phosphorus, in order to increase soil pH and increase the source of soil calcium nutrients.

3. Adjust the amount of soil phosphate fertilizer

Phosphate fertilizers are applied in large quantities year after year to cause phosphate enrichment and affect the absorption of calcium. Therefore, for the phosphate-rich orchards, the amount of phosphate fertilizer should be reduced or the method should be used every other year to promote the balance of phosphorus and calcium nutrition.

4. Spraying calcium fertilizer out of the root

Every year after the red meat pomelo is dropped, the calcium nutrient solution is sprayed 1-2 times during the period of fruit enlargement and the peak of calcium required before fruit harvesting. The calcium nutrient solution can be applied to a concentration of 0.3%-0.4% calcium nitrate, 0.3%-0.4% amino acid calcium, 0.2%-0.3% calcium chloride, and the effect of calcium carbonate is better. At the same time, the application of calcium into the appropriate amount of salicylic acid, magnesium sulfate, etc., can improve the spraying effect.

5. Drought prevention in winter and spring

Soil drought and water shortage are one of the main causes of calcium deficiency. In particular, the years of continuous drought in winter and spring should be irrigated with water from time to time before sprouting, and measures should be taken to prevent drought, so as to increase soil moisture and promote Root absorption of calcium nutrients.

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