Citrus Summer Management
Summer is a critical period for the growth and development of citrus. To ensure the 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 topdressing fertilizer or biogas slurry every 20 days or so, can be applied or spread from 30 to 50 cm away from the trunk. Determine the amount of fertilizer according to the size of the tree. Apply 1-4 to each 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 a groove outside the canopy drip line, the depth of the groove is 15-20 cm, the width of the groove is 25-35 cm, generally 1.5-2.5 kg of organic fertilizer (rotated cake fat) or 1-2 kg of compound fertilizer is applied per hundred kg of fruit. 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 20th to July 15th. The results of a large amount of trees are mainly short-falling, falling fruit branches and decaying branches. The tree with a small amount of results should be pruned in combination with tree transformation to eliminate the upright and dense branches in the upper part of the tree crown, and retract or short the branches around the crown 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.
III. Pest Control
1 Control of the flies: from the beginning of June on the adult fruit laid eggs, you can use 1000 times of the trichlorfon or 48% of chlorpyrifos (Lopspen) 1000 times and 3% brown sugar (which can prevent cornflowers and citrus Whitefly), 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 insects.
(2) Prevention and treatment of arrowheads, embroidered ticks, and citrus mealybugs: In mid-July, 1500-2000 times of winter or 99% of green lycium 200 times can be used for prevention and treatment.
3 Prevention and control of leaf miners: In the early autumn when the citrus is 0.5-1 centimeters or so, use 48% chlorpyrifos 1000 times or 40% ciprofloxacin 1000 times or double 600 times insecticide to prevent leaf miners, seven days, continuous 3 times.
4 Prevention and treatment of scar disease: At the beginning of the 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 orchards 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. (Zhang Fuqiong) (City Agriculture 110 Zhu Liqing)