Introduction: why navel oranges should "sparse spring shoots and wipe summer shoots"

The scientific practice of "thinning spring shoots and wiping summer shoots" for navel orange trees one year before or after production is an important measure to protect fruit and increase production. However, due to many fruit farmers will not use or improper implementation methods, not only failed to achieve the expected goal of high yield, but also caused the consequences of small crown, few branches and leaves and low yield of navel orange. The scientific operation method of "thinning spring shoot and wiping summer shoot" is introduced as follows, which can be used as a reference for fruit growers. 1. Sparse the spring shoots. Proper thinning of spring shoots of fruiting navel orange trees can protect flowers and fruits and promote yield. For the adult navel orange tree, the amount of spring shoot is small and it is the important mother branch of the second year and the base branch of the autumn shoot in the same year, the amount of thinning the spring shoot should be light, generally erase the late shoot; the early fruiting young navel orange tree is in the stage of transformation from vegetative growth to reproductive growth, it should be thinned seriously to promote enough autumn shoots to be used as the fruiting mother branch in the next year. Specific thinning methods: first, the amount of thinning should be appropriate for trees, generally removing 40% of spring shoots; second, heavy thinning of spring shoot vegetative shoots on branches with many flower and fruit branches, which can remove 1 stroke, 3 color, 1 stroke, 5, and some poor quality and redundant flower branches, so as to stabilize flowers and fruits. The spring shoot vegetative branches on the branches with few flower and fruit branches should be light or non-sparse, and they can pick the heart at the time of 2mur3 leaves, so as to reduce the competition for nutrition and promote fruit development; third, the spring shoots without flowers and fruit branches are generally not sparse or sparse, so as to ensure that there are enough branches as mother branches or basic branches for autumn shoots in the coming year, which are conducive to blossom and fruiting next year; fourth, spring shoots of prosperous trees should be more sparse and prosperous branches; spring shoots of weak trees should be sparse or not sparse, and weak branches should be sparse. For the spring shoot of the golden mean tree, the weak branches were mainly removed to maintain the balance between vegetative growth and reproductive growth. 2. Wipe the summer shoots. For young and adult trees put into production, too much summer shoot will cause the contradiction of nutrition competition between shoot and fruit, resulting in serious second physiological fruit drop, which greatly affects the increase of yield, so the summer shoot must be erased in time. The specific method is: the relatively empty part of the inner chamber of the crown or the summer shoot that needs to be expanded can be retained, as long as the coring is taken at 6 times, branches are promoted, and the crown is enriched. Wipe off the rest of the summer shoots when they are 3cm long and wipe them every 7 days until the autumn shoots are released. 3. Two matching measures must also be taken to thinning spring shoots and wiping summer shoots of navel oranges: one is to strengthen external fertilization and spray the mixed fertilizer solution of "0.2% boric acid or borax + 0.3% potassium dihydrogen phosphate + 0.3% urea" during the spring shoot emergence and flowering stage, spraying once every 7 seconds for 10 days, spraying 2 colors 3 times in a row to promote spring shoot ripening and protect flowers and fruits. Second, pay attention to summer pruning, after thinning and wiping most spring and summer shoots, the number of branches and leaves and the number of fruiting mother branches in the following year or the basal branches of autumn shoots in the following year will be reduced, and a summer pruning should be carried out in time to promote a strong and large amount of autumn shoot fruiting mother shoots to ensure high yield in the coming year. The pruning period is generally in the middle and late July, and the amount of pruning is suitable according to the situation of the tree. 5 days before pruning, the compound fertilizer of nitrogen, phosphorus and potassium is applied again to make the autumn shoots grow neatly and healthily. At the same time, the harm of leaf miner and aphids should be well controlled. Click to get more navel orange planting techniques click to get more fruit planting techniques