Key points of management techniques of citrus in spring

First of all, it is necessary to remove the litter, weeds and fruit in the orchard and plough the soil 15-20 cm deep. Then fertilize, irrigate, drain and prune the fruit trees, irrigate in time in case of dry and hot weather, and eliminate stagnant water in time in case of rainy weather. Spring is the season of frequent occurrence of diseases and insect pests, and there are many kinds of diseases and insect pests in flowering and young fruit stage, so it is necessary to do a good job in prevention and control.

1. Clear the garden

Remove litter, weeds and fruits from the orchard and bury them or burn them. It is also necessary to carry out shallow ploughing of the orchard soil at a depth of 15-20 cm to loosen the soil and enhance soil permeability.

2. Fertilization

For the young trees planted and survived last autumn, one shoot-promoting fertilizer was applied before spring shoot germination, mainly foliar spraying, supplemented by ground fertilization, nitrogen fertilizer, properly mixed with phosphorus and potassium fertilizer, in order to promote root growth and let young trees produce more new shoots.

For adult trees, 0.2 kg urea and 0.2-0.3 kg compound fertilizer should be applied to each tree from late January to mid-February. One fertilizer should be applied before flowering, which is mainly nitrogen and properly matched with phosphorus and potassium fertilizer. In the full flowering stage, boron fertilizer was sprayed and 0.3% urea solution was added for foliar spraying.

3. Watering

If it is rainy in spring, stagnant water should be eliminated in time, so as not to affect root growth or even rot roots, causing flowers and fruits to fall; if you encounter dry and hot weather for more than 10 consecutive days, irrigation should be made in time to keep the soil moist.

4. Pruning

For young trees, it is mainly to cultivate the shape of the tree, expand the crown, select the central extension branch and the main branch, and carry on the short cutting treatment.

For the first fruit tree, it is mainly to cultivate the crown, balance the tree potential, take the top heavy and the lower light, the outside heavy and the inner light pruning, promote the new branches, can properly dredge the long spring shoots.

For fruit trees, after the temperature rises, fruit pedicel branches, dry and withered branches, dense branches, cross branches, disease and insect branches, retracted or short truncated fruit branches, over-long flower buds in flowering period, leafless flower branches, dense flower branches and spring shoot buds less than 5 cm are removed, and the spring shoots are coring up to 7 leaves.

5. Protect flowers and fruits

From flowering to flowering, the petals are shaken in time to prevent petals from rotting and adhering to the young fruit in cloudy and rainy days, which is conducive to turning green, improving the fruit setting rate and reducing the occurrence of gray mold. In the full flowering period, flowering period, if you encounter "hot and dry wind" or "late spring cold" and other disaster weather, plant growth regulators should be selected to protect flowers and fruits.

6. Control of diseases and insect pests

There are many kinds of diseases and pests in flowering and young fruit stage, so it is necessary to do a good job in the prevention and control of diseases and insect pests. Diseases and insect pests include anthracnose, scab, canker, flower bud maggots, wood lice, leaf miner, aphids, red spiders, thrips and so on.