Production management of growing citrus in spring

At present, it is in the stage of citrus spring shoot emergence, and it is also a time of year when there are more diseases and insect pests. Tree growth is good or bad, and the degree of pest control, yield and fruit quality are all directly related to the management of this period. Therefore, in production, we should pay attention to the key link of spring production management on the basis of winter management.

I. soil management

1. Dig drainage ditch. Dig box ditches and side ditches in the park, 40 cm deep and 30 cm wide, to facilitate drainage and daily irrigation in the rainy season.

2. Planting green manure. Plant clover, ryegrass, purple yunying, legumes and vegetables around the tree plate in the park to conserve water, prevent soil water evaporation, and increase soil organic matter and looseness.

II. Fertilizer and water management

In the spring shoot-out period of citrus, nitrogen and phosphate fertilizers were mainly applied, combined with 2 ‰ urea + 3 ‰ potassium dihydrogen phosphate foliar topdressing. For the citrus orchards without base fertilizer in winter, the base fertilizer was applied once at the dripping waterline of the tree plate, and 50 jin of human and animal manure, 0.2 jin of urea, 0.3 jin of phosphate fertilizer or ternary compound fertilizer were applied to each plant, mainly in strip ditches or holes, and the ditch (hole) should be dug to realize the alternation of orientation during the second fertilization. Fertilizer must be evenly balanced with the soil to avoid fertilizer damage. The amount of fertilizer should be fertilized according to the tree potential, with more application in weak trees and little or no application in prosperous trees.

At the same time, when spraying boron outside the root at the time of bud whitening and blooming at 2/3, 3 ‰ borax fertilizer can be used for foliar spraying to ensure flower quality and improve fruit setting rate.

III. Pest control

On the basis of winter control, attention should be paid to the control of brown spot, anthracnose and other diseases after the beginning of spring. The main pesticides are: Dysen zinc 800m 1000x solution, methyl thiophanate 800x solution, chlorothalonil 1500 fold solution, Wang copper 600x solution and so on. In the prevention and control of insect pests, attention should be paid to the control of flower bud maggots, flower thrips, scale insects, red and yellow spiders, aphids and so on. The main drugs are: Lesben 1000Mel 1500 fold solution, imidacloprid 3000 Mel 5000 fold solution, pyridaben 1500 fold liquid, dichlorvos 800ml 1500 fold solution, rotenone 2000 fold solution.

Note: spray should be evenly sprayed on the back and surface of the leaves. Drugs should be used alternately to avoid drug resistance. The use of highly toxic pesticides is prohibited to avoid pesticide residues.