Analysis on fertilization of kiwifruit of different tree ages

The growth of kiwifruit is different in different tree ages, and the fertilizer requirement is also different. According to the experience of fertilization at home and abroad and the experimental study on the fertilization of Chinese kiwifruit varieties, the Institute of Horticulture of Jiangxi Academy of Agricultural Sciences put forward the proportion of fertilizer application of different tree ages, and obtained high-yield and high-quality kiwifruit in production and application. Kiwifruit yield reached 3750-7500 kg per hectare in early fruit stage, 15000-22500 kg per hectare in early fruit stage and 22500-30000 kg per hectare in full fruit stage. 1. The main purpose of fertilization for young kiwifruit trees (1-2-year-old trees) is to expand the crown, form and bear fruit as soon as possible. Topdressing is mainly available nitrogen fertilizer. Topdressing 2-3 times a year. Before the first sprouting, 50g urea was applied per plant, and 50g urea was applied in the new shoot growth period. Fertilizer will be applied according to the growth status of kiwifruit trees in the future. two。 The fertilization of kiwifruit trees (3-4-year-old trees) in the early fruit stage is mainly plastic surgery for kiwifruit in this period. At this time, the vegetative growth of kiwifruit is dominant, but it has begun to turn to reproductive growth, and all trees blossom and bear fruit and have a certain yield. The total amount of fertilizer applied to kiwifruit trees in the first fruit stage and the proportion of fertilizer in the main fertilization period can be determined by referring to Table 4-4. During this period, the amount of fertilizer applied per hectare of kiwifruit can refer to the following data: base fertilizer, 1500 kg of straw or 1500 kg of animal manure, 1500 kg of cake fertilizer, 750kg of calcium phosphate fertilizer, 150kg of urea before budding, 150kg of urea and 450kg of compound fertilizer or 225kg of potash fertilizer. 3. Fertilization of kiwifruit trees (5-6-year-old trees) during this period, kiwifruit tree shape has been formed, and covered with shelf surface, the tree potential began to turn to the mean, reproductive growth and vegetative growth began to balance. The amount of fertilizer applied in the whole year and the proportion of fertilizer in the main fertilization period can be determined with reference to Table 4-5. The amount of fertilizer applied per hectare of kiwifruit during this period is as follows: basic fertilizer, 2400 kg cake fertilizer, 22500 kg animal manure or 22500 kg straw, 1200 kg calcium magnesium phosphate fertilizer; pre-bud fertilizer, urea 225kg or compound fertilizer 375kg; strong fruit fertilizer, 750kg compound fertilizer or 375kg potash fertilizer; fruit picking fertilizer, depending on the tree potential. 4. In the period of fertilization of kiwifruit trees (more than 6 years old), the reproductive growth and vegetative growth of kiwifruit are relatively balanced, which is the period of high quality and high yield of kiwifruit. The amount of fertilizer applied in the whole year and the proportion of fertilizer in the main fertilization period can be determined with reference to Table 4-6. The amount of fertilizer applied per hectare of kiwifruit in full fruit period is as follows: basal fertilizer, 36000 kg cake fertilizer, 30000 kg animal manure or straw, 3000 kg calcium magnesium phosphate fertilizer; pre-bud fertilizer, 450kg compound fertilizer or urea 300kg; strong fruit fertilizer, 900kg compound fertilizer or 450kg potash fertilizer; fruit picking fertilizer, according to tree potential, as appropriate. The type of fertilizer applied can be determined according to the conditions of local fertilizer sources. When applying, according to the content of effective components of different tree ages and different fertilizers, with reference to the above standards, the required amount of all kinds of fertilizers should be calculated and fertilized reasonably. 5. The amount of fertilizer application was determined according to the tree size and fruit amount of kiwifruit orchard, soil conditions and the characteristics of fertilization. The matching ratio of nitrogen, phosphorus and potassium in fertilizer is 1-0.8-0.8-0.9.