In early spring, after the soil thaws and sap begins to flow, it's the ideal time to apply a pre-germination fertilizer. This stage is crucial for promoting budding, flowering, and the growth of new shoots. The fertilizer should be applied before the buds start to open, focusing mainly on nitrogen, which makes up 1/2 to 2/3 of the annual nitrogen requirement. A small amount of phosphorus and potassium should also be included. For a 4-year-old tree, it's recommended to use about 8–10 kg of pure nitrogen, 4 kg of phosphorus, and 4 kg of potassium. After applying the fertilizer, water the garden 1–2 times to help the nutrients penetrate the soil.
After flowering, when the kiwifruit starts to grow rapidly—typically 30–40 days post-flowering—it's important to provide additional nutrients. This is the fruit-promoting phase, where the fruit expands quickly. Applying a quick-release compound fertilizer during this time helps support this growth. For a 4-year-old tree, you can apply 0.25–0.3 kg of diammonium phosphate per plant. Water the garden once after application to ensure the nutrients are absorbed effectively.
During the summer months, especially in June and July, it's beneficial to apply a top-dressing of phosphorus and potassium fertilizers to improve fruit quality, increase fruit size, and enhance internal fruit development. In addition, if needed, you can spray nitrogen-based fertilizer 1–2 times to compensate for nutrient deficiencies that may occur later in the growing season. At the same time, foliar sprays of calcium can improve the fruit’s storage ability. You can use solutions such as 0.5% potassium dihydrogen phosphate, 0.3–0.5% urea, or 0.5% calcium nitrate for these foliar applications. These practices not only support fruit development but also contribute to better overall tree health and long-term productivity.
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