Citrus Summer Management

Summer is a critical period for the growth and development of citrus. To ensure high quality and high yield of citrus, it is important to strengthen summer management. The specific measures are as follows:

One, summer fertilization

Sapling Fertilization: Apply top-fertilizer or biogas slurry every 20 days or so, and apply or spread 30-50 cm away from the trunk. Determine the amount of fertilizer according to the size of the tree. Apply 1 to 4 per plant. . At the same time, do a good job of foliar fertilization and timely supplement of the trace elements required by the tree.

Results Tree fertilization: In the middle and late June, the fruit enlargement period accounts for about 60% of the annual fertilization amount. The method is to apply the ditch outside the canopy drip line. The ditch depth is 15-20 cm, and the ditch width is 25-35 cm. Generally, the organic fertilizer (rotate cake fat) is 1.5-2.5 kg or compound fertilizer is 1-2 kg. The amount of fertilization. (Goldwater Orange uses high-nitrogen and potassium-rich compound fertilizers, and Satsuma Mandarins should use high-potassium compound fertilizers) Try to avoid the use of simple chemical fertilizers, so as to avoid the occurrence of rough skin, fruit, or lack of elements. Biogas residue can also be used for soil pouring.

Second, summer trim

The purpose of summer pruning is to adjust the structure of the tree to improve the quality of the fruit. The best time to prune is from June 20 to July 15. The results of a large amount of trees are mainly short-falling and falling fruit branches and decaying branches. The tree with a small amount of results should be pruned in combination with the transformation of the tree type. The upright and dense branches in the upper part of the tree canopy should be removed, and the branches outside the canopy should be retracted or shortened so that the crown height can be controlled to about 2 meters. The partial result tree can use alternative results, alternately updated pruning methods. After pruning, proper cutting should be carried out in combination with fertilization to protect branches and strengthen management of fertilizer and water.

Third, pest and disease control

1. Control of drosophila: from early June on the adult fruit laid eggs, use 1000 times solution of trichlorfon or 48% chlorpyrifos (Lesben) 1000 times solution plus 3% brown sugar (which can prevent sagittal tipping and Citrus mealybug), 1/3 canopy spray each time, 7-10 days, three times in a row. In addition, hanging sweet and sour liquid on the canopy to trap adult worms.

2. Prevention and cure of arrowheads, embroidered ticks, citrus mealybugs: In mid-July, it can be used for prevention and treatment of 1500-2000 times of winter or 99% of Green Ying 200 times.

3. Prevention and control of leafminer moth: In the early autumn when the citrus is about 0.5-1 centimeters long, 48% chlorpyrifos 1000 times solution or 40% mitoaphos 1000 times solution or double insecticide 600 times solution to prevent leaf miner, once in seven days, Three times in a row.

4. Prevention and treatment of sapemia: In the early stage of disease, 50% thiophanate-methyl suspension solution 1000 times or 40% carbendazim 800 times solution can be used for prevention and treatment.

Fourth, orchard coverage

Covering the orchard in summer can reduce soil temperature and maintain soil moisture, which is beneficial to fruit growth. The method is to cover the trees with rice straw, straw, straw, etc. 10 cm away from the trunk, and the thickness is about 10-15 cm. Orchard grass or Natural grass cultivation can also be carried out. The grass should be cut more than 30 cm in height, and trees should be covered after cutting.

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