Citrus many times a year to shoot shoots, a large amount of growth, long fruiting period, especially the consumption of nutrients. To ensure the normal growth and results of citrus, fertilizer must be added in time to increase soil fertility.
Fertilization period and amount of fertilizer:
The fertilization of young trees is mainly to promote the growth of branch shoots, rapid formation of the crown, and early entry into the result period. According to the needs of vegetative growth, nitrogen fertilizers should be used as the main method. Generally 1-3 years old saplings, in the medium level (referring to fertilizer and water) in the soil, the annual fertilization amount of each plant is pure nitrogen 0.13-0.25 kg (not including soil fertility), such as the conversion of urea is about 0.25-0.5 kg. The amount of fertilizer should increase year by year as the age of the tree increases. The fertilization time should be given in batches before spring, summer and autumn. It is usually applied once every month from March to July and stopped from August to September so as to avoid cold damage from late autumn shoots. In October-November, a winter overheating fertilizer was applied, and 5-8 pounds of fertilizer can be applied per plant.
When the orange tree grows to 5-6 years old, the results begin one after another. According to the characteristics of this period, it is necessary to continue to expand the canopy, but also the result of flowering. Generally, it is necessary to apply basic fertilizer three times, sometimes depending on the tree vigor and weather conditions. 2 times fattening.
1 bud before fertilizer. It is generally applied from late February to mid-August. The purpose is to promote the development of a strong spring and improve the quality of flowers, improve the fruit rate and so on. Fertilizers are dominated by nitrogenous fertilizers, combined with phosphate fertilizers and combined with quick-effect fertilizers and slow-acting fertilizers.
2 strong fruit promote shoot fertilizer. It is generally applied from mid-July to early August. In August-September, the period of rapid fruit enlargement is rapid, and it is also the period of autumnal shoots (early autumn shoots are good results for the next year). This fertilization is related to the production of the current year and the following year, so it should be dominated by high-quality quick-effect fertilizers. The fertilization amount accounts for about 1/3 of the whole year.
3 fruit fertilizer. It is generally applied from late October to mid-late November. The purpose is to restore the tree vigor, protect the leaves from the winter, improve the cold resistance, promote flower bud differentiation, overcome the size and annual results. This fertilizer is the focus of the whole year, and the amount of fertilizer is about 40% of the whole year. It should be appropriate to use slow-acting fertilizer and quick-acting fertilizer.
In addition, in mid-April to late May, the tree should be re-applied again. To supplement the nutrients consumed by pregnant buds and flowering, to increase the fruiting rate, which is particularly effective for multi-flowering trees and old trees. This time fertilization should be mainly potassium, phosphorus, with a certain amount of nitrogen and magnesium. In September-October, when the weather was dry, a quick-release fertilizer could still be applied in combination with irrigation, which had good results for many fruits, weak tree vigor and fruit growth of late-maturing varieties.
The amount of fertilizer applied to orange trees varies with species, age, vigor, climate, and soil properties. In general, a mandarin orange of 5-6 years old is produced with about 0.5-0.6 kg of pure nitrogen per year, 0.3-0.4 kg each of phosphorus and potassium. Approximately 50 kg of manure or green manure was dismantled, 25 kilograms of human waste, 1 kg of cake fertilizer, 1 kg of phosphate fertilizer, 5 kg of plant ash, and 1-1.5 kg of lime every other year. For fertile soil, weak tree vigor, and high temperature and humidity environment all year round, fertilization should be increased as appropriate.
The tree of adult results is mainly cultivated for high yield and stable production. The basic fertilizer application period is the same as the initial result tree, and the amount of fertilizer should be determined based on the amount of results. According to reports, 3000-3,500 kilograms of oranges are produced per mu, and 15-25 kilograms of pure nitrogen can be used to meet the needs. The proportion of nitrogen, phosphorus and potassium applied in the whole year is 10:2:7. Different varieties need different fertilizers.
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