The main varieties of citrus are orange (Huangyan Tangerine), local early red orange, Zhuhong, some oranges, Wenzhou oranges, fine skin oranges, snow oranges, oranges and so on. It is an evergreen fruit tree, and its physiological activities are on the verge of annihilation. The number of shoots is numerous and the fruit grows long. In winter, it also undergoes assimilation and flower bud differentiation. Therefore, we must pay attention to the combined application of nitrogen, phosphorus and potassium fertilizers and thin measures to meet the perennial growth and development of orange trees. At the same time, fertilization with small amounts of rainfall in areas with high rainfall is beneficial to fertility conservation. Fertilization is best coordinated with organic and inorganic fertilizers. Young trees should be dominated by nitrogen to promote growth, and the results tree should be based on nitrogen fertilizer, adding phosphorus and potassium fertilizers to increase yield and quality; aging trees need more Apply nitrogen fertilizer to restore tree vigor. 1. The annual amount of fertilized orange trees is about 100g per year of nitrogen (n) per plant, and after each additional year, 50g of nitrogen fertilizer is added, and fertilization can be carried out according to the amount of fruit after entering the high yield period. Generally high yield orangery, nitrogen (n) 25-30kg per mu, phosphorus (p2o5) 13-15kg, potassium (k2o) about 18kg, equivalent urea 62-75kg, calcium superphosphate 90-100kg, potassium sulfate about 36kg. 2. Fertilization time Sapling fertilization should be applied thinly. Before and after the new shoot is germinated, it should be applied once every 15 days. Once shoots are cooked, they can be applied once a month. Two-year-old trees are applied once a month. After reaching the age of the results, it is best to apply them 6-8 times a year. However, most of the orchards are mainly applied four times. (1) Base fertilizer: Citrus base fertilizer is applied after the fruit is harvested from early to late November. Late-maturing varieties, such as orange and orange, can be used 7-10 days before harvest. This fertilization to restore tree vigor, improve cold resistance, prevent defoliation, and promote flower bud differentiation are also important measures to overcome citrus size. Fertilizer is dominated by nitrogen fertilizer, with phosphorus and potash fertilizers, and the amount of chemical fertilizer applied is 30% of the total amount of fertilization in the year. Apply about 800kg per acre, 19-23kg of urea, about 20kg of superphosphate, and about 13kg of potassium sulfate. After mixing the various fertilizers described above, it is best to combine deep plowing with winter plowing, or applying a circular furrow under the canopy Shi. If the time is too late, some of the quick-acting fertilizers can be used as top-dressing fertilizer. (2) Dressing (three times): For the first time, it is before flowering. This time the fertilizer is applied again. It is generally applied one month before flowering. Zhejiang Huangyan usually appears in mid-April buds, fertilization should be in mid-March, the amount of fertilizer is 30% of the total (the same amount with basal). Most fertilizers for nitrogen, phosphorus, and potassium are available with slow-acting fertilizers such as bone meal, calcium, magnesium phosphate fertilizer, and manure fertilizer. Then, mix the above fertilizers and apply them in a circular manner or under a canopy along the crown. This fertilization can promote spring shoots and flowering results. The second young fruit formation period top dressing. Huangyan, Zhejiang orange fruit generally young fruit formed in May-June, during which nutrient consumption, such as fertilizer supply is insufficient, it is easy to cause flowering and fruit drop, this fertilization can achieve fruit preservation purposes, therefore, fertilization time should be in late April Before completion, if it is delayed until June, it will cause a lot of pumping at the end of June, resulting in a large number of fruit drop, which will seriously affect the output. The amount of fertilizer is 20% of the total amount of fertilizer applied in the year, about 14kg of urea is applied, about 20kg of superphosphate, and about 20kg of potassium sulfate. After mixing the above fertilizers, weeding and weeding are performed along the cavern under the canopy. Groove, after watering. The third time in June to see the crown: in May-June, the young fruit began to grow up, such as nutrient deficiencies, easy to drop fruit, timely application of available nitrogen fertilizer and phosphate fertilizer. The amount of fertilizer applied is 10% of the total annual application rate, and the method of application is the same as the second time. Can also be used outside the full root dressing, in late May, with 0.5% of urea and superphosphate water fertilizer, spraying once every 10 days, 3 times in a row, can increase 50-80%. This fertilization is not only beneficial to fruit enlargement, but also beneficial to the pumping of summer shoots, that is to lay a good foundation for the formation of good results. However, it is better to avoid applying this fertilizer to local varieties that are likely to cause heavy fruit drop in June. Only when the results are many, the vigor of the tree vigor is weak, and the June tipping is less, it can be applied. The fourth time is the first half month (July to August) of the autumn shoots. The fruit is rapidly expanding and the autumn shoots are drawing. The autumn shoots are also the main result of the following year. Application. Mushi ammonium sulphate about 8kg, superphosphate about 10kg, potassium sulfate about 4kg, after mixing the above various fertilizers, about 3% water and fertilizer solution of about 800kg, combined with cultivator weeding, along the canopy under ring cast. It is necessary to delay the application of local early varieties.
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