Five key points for winter management of growing citrus

After citrus fruit harvest, because the fruit of the tree consumes a lot of nutrition, it needs to supplement nutrition and restore the tree potential. Winter is also the key period for citrus flower bud differentiation and overwintering of diseases and insect pests. Therefore, strengthening winter management is the basis for high yield and reducing the harm of diseases and pests in the coming year.

1. Early application of base fertilizer in order to facilitate citrus flower bud differentiation, improve flower bud quality, increase tree nutrition and improve frost resistance, base fertilizer must be applied early. Fruit trees can be fertilized one week after fruit picking, and young trees must be finished in November. The fertilizer is applied early and the temperature is higher, which is beneficial to fertilizer decomposition and tree absorption, and the effect of fertilization is good. This fertilizer is mainly organic fertilizer, with special fertilizer for fruit trees, which can be fertilized by ring ditch and strip ditch method.

Second, open ditches and drain waterlogging to prevent wet damage this autumn due to continuous rain and high humidity in the field, and citrus is not allowed to soak, if there is much soil moisture, the soil roots are easy to mildew, resulting in yellowing leaves, fallen leaves, and serious tree death. Therefore, it is convenient to manage in the future by opening ditches and discharging moisture in time combined with fertilization and shaping the tree belt.

Third, the sources of disease and insects harmful to citrus in time are overwintered in litter, weeds and fruit. Therefore, in early winter (mid-November), disease and insect branches, dry and withered branches, fallen leaves, fallen fruits and weeds were all thoroughly cleared out of the orchard and buried in a concentrated burning style. At the same time, all the late autumn shoots issued after September 20 should be cut off to prevent the extended growth of late autumn shoots and reduce the cold resistance of trees.

Fourth, after clearing the garden for disease and pest control, 45% will be used every month since late November. Foliar spray of 180 Mel 300 times liquid of stone sulfur mixture can effectively control overwintering anthracnose, mites, shell insects and other diseases and insect pests, reduce the number of drug use in the coming year, and improve production efficiency.

Fifth, strengthening the anti-freezing injury has a great impact on the citrus tree body and next year's yield, which can be prevented by trunk whitening and tree plate (tree belt) film mulching or (rice straw). Trunk whitening can not only prevent freezing, but also prevent trunk diseases and insect pests. Stir with 72% water, 22% quicklime, 3% stone sulfur agent and 3% salt to evenly whiten the citrus trees, so that they do not flow down and do not stick together. Quicklime must be dissolved. Otherwise, it will burn the tree trunk by absorbing water and releasing heat, and anti-freezing measures must be completed in early December to enhance the anti-freezing effect.