Kiwifruit grows fast, results early, consumes a lot of nutrients, and needs reasonable fertilization every year to meet the requirements.
(1) Fertilization time: Kiwifruit is generally fertilized once a year, and topdressing 2 to 3 times.
Base fertilizer: generally applied before harvesting leaves. The time is from October to December. Mainly organic fertilizer, appropriate combination of phosphorus, potassium fertilizer and quick-acting nitrogen fertilizer or human excrement.
Germination fertilizer: carried out from the end of February to the middle of March before germination. The sprouting fertilizer is mainly based on quick-acting nitrogen fertilizer to promote the growth of new shoots and improve the rate of results.
Strong fruit fertilizer: also called summer fertilizer, carried out from May to July. Apply nitrogen fertilizer and potassium fertilizer, combined with root dressing, spray 1 or 2 times potassium dihydrogen phosphate. This fertilizer is the most important fertilization in a year.
(2) Quantity of fertilization: There is a direct relationship between the amount of fertilization and the age and annual yield. Generally, 56 plants per year are planted with 100 grams of urea, 135 grams of phosphate, and 345 grams of potassium per year. The annual growth of 4 grams of urea per plant is 300 grams per plant, 375 grams of phosphate, and l035 grams of potassium; 8 years of trees per plant. Apply 650 grams of urea, 835 grams of phosphate, 2070 grams of potassium. At the same time, a certain amount of organic fertilizer should be buried every year to ensure sufficient fertilizer source. Kiwifruit avoids chloride. When the chloride ion concentration in the soil reaches 700 mg/kg, it will cause toxicity to the plants. Therefore, the application of chlorine-containing (such as potassium chloride) fertilizer should be avoided as much as possible.
(3) Fertilization method: Generally used are annular groove application, radial groove application, strip application and application.
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