At present, it is an important period for citrus fruit development. In order to ensure the amount of flowers in the coming year and reduce the size of the year, proper combing should be carried out on the citrus trees with large fruit volume. Remove pests and diseases, deformed fruits, cracked fruits, Chaotian fruits and large (small) fruits, improve the consistency of fruit size, appearance and quality.
Today, we will explain the cultivation and management techniques of Citrus in autumn from three aspects, hoping to be helpful to everyone.
1, the time and method of Citrus summer scissors
Summer pruning is a pruning process from the beginning of young fruit development to the completion of rapid vertical fruit growth. It focuses on shoot and young fruit management, and mainly solves the problems of balance of growth and fruit, ventilation and light transmission of tree crown.
The main tasks of summer pruning are to open the branch angle, control the growth of new shoots, balance the tree potential, straighten out the subordinate relationship between the main branches and various branches groups, improve the ventilation and light transmission conditions of the crown, and ensure the rhythm, coordination, balance and quality between the growth results of the tree and the germination and differentiation. When the fruit is too fruitful, the young fruit should be thinned as early as possible, and sterilized and bagged, The physiological fruit drop caused by nutritional competition should be reduced.
2, how to apply citrus autumn fertilizer
Points for attention in fertilization
Available nitrogen, phosphorus and potassium are basic.
Nitrogen: the absorption of nitrogen by citrus began to decrease after July. Autumn shoots need a certain amount of nitrogen during the shooting period. The growth of autumn shoots and the later stage of fruit expansion should not be too much nitrogen, which will affect the coloring and fruit maturity.
Phosphor: phosphorus mainly promotes flower bud differentiation, terminal bud and rooting, and promotes coloring. It should be supplemented in autumn and spring.
Potassium: potassium is a target and carrier for nutrient transportation. The absorption of potassium in Citrus increased after June, and in September, the fruit absorbed the most potassium. Therefore, the amount of potassium fertilizer could be increased appropriately during this period. However, it should be noted that excessive potassium can inhibit the absorption of calcium, magnesium and other nutrients, and may cause rough skin.
No trace elements are needed.
_Calcium supplementation is also needed in autumn shoot period. The last growth peak of Citrus Root system will be ushered in autumn. Calcium supplementation helps to promote hair roots. Developed roots are the guarantee of healthy autumn shoot.
_Magnesium and trace elements should be supplemented in autumn shoot stage. Leaflets, yellow leaves and mosaic appeared in new shoots. Autumn shoots did not turn green, not because of insufficient fertilizer, but because of unbalanced nutrition and lack of magnesium and trace elements.
The 7-9 month is the period of rapid expansion of citrus fruit, and also the enrichment of summer shoots and the extraction period of autumn shoots. At this time, temperature and soil temperature are higher, root absorptive capacity is strong, nitrogen, phosphorus and potassium are absorbed more, and fertilizer efficiency is higher. The nutrient absorbed by roots increased faster in the tree and increased in nutrient consumption.
At this time, combining irrigation and drought resistance to catch autumn shoots fertilizer has obvious effects on promoting the growth of strong fruit and autumn shoots. June-July is the critical period for citrus to need nutrients, and June-September is the critical period for citrus tree vigor cultivation. At this time, fruit enlargement, flower bud differentiation and autumn shoot need nutrition.