In early spring, after the soil thaws and tree sap begins to flow, it's the perfect time to apply a pre-germination fertilizer. This stage is crucial for promoting bud development, flowering, and the growth of new shoots. The fertilizer should be applied before the buds start to open, with a focus on nitrogen-rich nutrients—approximately half to two-thirds of the annual nitrogen requirement. A small amount of phosphorus and potassium should also be included. For a 4-year-old tree, you can use around 8–10 kg of pure nitrogen, 4 kg of pure phosphorus, and 4 kg of pure potassium. After applying the fertilizer, water the garden 1–2 times in the spring to help the nutrients penetrate the soil.
After flowering, when the kiwifruit starts to grow rapidly—usually 30–40 days post-flowering—it’s important to provide additional nutrients to support fruit expansion. Applying a quick-release compound fertilizer during this period helps ensure the fruits develop properly and reach their full size. For a 4-year-old tree, you can apply about 0.25–0.3 kg of diammonium phosphate per plant. Watering the garden once after application will help the nutrients reach the roots more effectively.
During the summer months, especially in June and July, it's beneficial to apply a top-dressing fertilizer to improve fruit quality, increase individual fruit weight, and enhance overall fruit flavor. At this time, focus on phosphorus and potassium fertilizers to meet the tree's nutritional needs. Additionally, if needed, you can spray nitrogen fertilizer 1–2 times to support the later growth of shoots. To improve the fruit's storage ability, foliar sprays of calcium fertilizer are recommended. You can mix solutions such as 0.5% potassium dihydrogen phosphate, 0.3–0.5% urea, or 0.5% calcium nitrate for effective foliar feeding. These practices not only boost fruit quality but also contribute to better long-term storage and marketability.
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