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For colonization earlier, spring shoots neat and tidy, can go to zero to stay intact, attack the summer shoots and autumn shoots, each time before tipping about 20 days before the first fat recovery, 7 to 10 days after chasing 1 fat, The tip of the shoot was applied after cutting once and the autumn shoot turned green. From September to November, it was maintained once a month.
Late colonization, wound roots have not been restored, spring shoots are difficult or late, and not neat, and thus affect the summer and autumn shoots, fertilization should be applied to thin, the amount of from much to less, by Light to concentrated approach, the best monthly application of 3 to 4 times fertilizer, start with leachate water or 50L water on 100 ~ 150g urea, dissolved after pouring 10 to 12 trees. With the increase of tipping amount, the amount of fertilization can be slightly increased, but the summer and autumn dry seasons should not be increased, and the concentration of manure water should be less or no more urea. From September to November, water and fertilizer should be applied once a month.
Phosphorus and potassium fertilizers in orchards that are not fully applied prior to planting should be increased year by year. Phosphorus and potassium fertilizers should be applied year by year. After 1 month of sapling planting, the new roots should begin to move and can be applied with diluted manure water. The amount of fertilizer should not be too low, and should not be too light. In particular, chemical fertilizers should be used with care so as not to damage the roots. Each time the new shoots are fired and during the growing season, they must be applied 1 to 2 times quick-release fertilizer, and strive to pump 3 to 4 shoots per year, that is, from the end of February to the beginning of March, apply the spring shoot fertilizer, and in mid-to-late May, the summer shoot fertilizer. In early July and mid-July, early autumn shoot fertilizer was applied, and in late November, good winter fertilizer was applied. In areas prone to frost damage, fertilization should be stopped from August to October to prevent late autumn shoots and winter shoots, and to avoid the consumption of nutrients to produce freezing damage. In the second year after planting, the amount of fertilization should be gradually increased, combined with the application of organic fertilizers to improve the amount of phosphorus and potassium fertilizers, and the amount of lime added to the acid soil to cultivate dense root groups and strong autumn shoots, and lay the results for the third year. Basic, 2 to 3 years of tree fertilization, to seize the successive shoots during the shoot growth period, tapping the tip of the first half or so to attack the tip of the fertilizer, the tip of less should be chasing after 1 attack attacking fertilizer; tip from the shear or topping, After applying top-dressing fertilizer once, the shoots turn green and two additional manures are added.
Fertilizer should pay attention to the difference between weak trees and strong trees. In order to ensure the normal growth of the weak tree three times and increase the number of new shoots, the summer shoots can be promoted in the first year after planting. When the summer shoot grows to 7-8 leaves, it will be picked up and supplemented with fertilizer. Enriched with stoutness, the early autumn shoots promoted by fertilization are robust and can play a role in raising small shoots. The second year after planting, the summer shoots of the weak branches should not be short-cut, and because of the poor nutrition conditions after short cuts, the growth of the new shoots will become weaker.
Results The main points of fertilization of former citrus saplings
The purpose of fertilizing the former saplings of the citrus fruit is to rapidly expand the canopy, laying the foundation for the early end of high yields. The effective measure is to dilute the application of nitrogen fertilizer. The role of nitrogen fertilizer is to attack spring, summer and autumn shoots, and the summer shoots grow fast and fat and play a significant role in expanding the crown. With the increase of the age of citrus trees, the crown is expanding, and the amount of fertilizer should be increased year by year. At the same time, appropriate amount of phosphorus and potassium fertilizer should be used. Due to the small and shallow root distribution of citrus trees, weak absorption capacity and no fruit burden, fertilization is based on the principle of a small number of multiple times and adopts the method of diligent application. There are more open lands in the sapling citrus orchards. In order to improve the soil, increase the organic matter of the soil and eliminate the growth of weeds, legume green manure should be cultivated in winter and summer, and the soil should be deeply turned into soil and matured.