As the result of the anniversary of papaya blooms, the amount of nutrients required for large amounts and trace elements must be sufficient. According to the introduction of Guangzhou City Fruit Tree, the ratio of nitrogen, phosphorus, and potassium in the vegetative growth period is 5:6:5, and the reproductive growth period is 4:8:8, while the ratio recommended in Taiwan is 4:8:5. During the site preparation, the organic fertilizer was applied to the planting hole, and 100 kg per mu was used. After 10-15 days of planting, thin application of raw fertilizer was started. Fertilizer was applied once every 10-15 days in the next two months. From thin application to multiple application, from lean to concentrated. Planting trees in spring from May to August is the most critical period for fertilization. Early maturing species generally have 24 to 26 leaves on buds (45-50 days). Before and after budding, heavy fertilizers are applied in time to provide flower buds for the formation of needs, and nitrogen fertilizers are still dominant. Appropriate application of phosphorus and potassium fertilizers. Before the end of August, 80% of the annual fertilizer should be applied. After September, the main fruit fertilizer should be applied. At this time, the flowering fruiting period should be increased and the heavy fertilizer should be added to meet the needs of the development of the base fruit and the top flowering fruit. Papaya in June will be heavily applied once a month from June to October. It requires high levels of nitrogen, phosphorus, and potassium. Each time, 100-300 grams of NPK fertilizer is applied to each plant. Borax. In August, organic fertilizers, such as cooked peanut bran, should be added to help improve fruit quality. In order to ensure the nutrient needed for seed development, attention should be paid to the application of phosphorus and potassium fertilizers. According to the experience of Guangdong, an annual output of 45 tons of fruit per hectare of orchards will require 3,000 kg of compost, 4000 kg of water, 20 kg of urea and 80 kg of compound fertilizer per acre.
In Taiwan, the fertilization of papaya is generally based on a base fertilizer of 1,000 kg/ha. Top dressing depends on actual needs. Sandy land is fertilized once every 1 to 1.5 months, 100 to 150 grams each time, and loam is applied once every 2 to 3 months, 200 to 300 grams each time, which is about 1.25 kilograms per plant per year. The juvenile tree adopts a ring-shaped groove and the result is that the tree is applied in a ditch or in a ditch. India's research results suggest that 200g of nitrogen, 300g of phosphorus pentoxide, and 600g of potassium oxide per plant of Papaya can produce better yields, while the fruit quality is 200g of nitrogen, 200g of phosphorus pentoxide, and potassium oxide. 200 grams is better. The annual application amount of organic fertilizer is recommended as 15 g nitrogen/strain, equivalent to 5 kg/strain of composted pig manure or 4–6 kg/strain of cattle pen manure. Brazil recommended nitrogen fertilizer to apply 343 grams per plant per year. In Colombia, papaya was applied once a month for four months after transplantation, with 10, 10, 20, and 30 g per plant respectively, followed by 50 grams each time every two months, and annual nitrogen total application. The dosage is 366 kg/ha and the yield per plant can reach 66 kg, ie 110 tons per hectare.
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