Fruit tree spring fertilization guidance
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Soil fertility status in fruit trees and annual fertilizer input: 1. Soil nutrient levels in orchards typically show an organic matter content of 11–15 g/kg, total nitrogen at 0.5–0.9 g/kg, available phosphorus ranging from 15–30 mg/kg, and available potassium between 100–150 mg/kg. 2. Fruit trees generally absorb nutrients in a ratio of 2:1:2 for nitrogen, phosphorus, and potassium, respectively. Based on soil fertility assessments, yield expectations, and current fertilization practices, the average annual requirement per acre is approximately 25–40 kg of pure nitrogen, 10–20 kg of P₂O₅, and 20–40 kg of K₂O.
In spring, fertilization primarily involves chemical fertilizers, with organic fertilizer recommended for fields that did not receive autumn applications. The proportion of annual fertilizer input distributed in spring usually includes 50–60% of nitrogen, 20–30% of phosphorus, and 30–40% of potassium. For normal fruit trees, the typical application rate is 10–20 kg of pure nitrogen, 5–10 kg of P₂O₅, and 10–15 kg of K₂O per acre. Fertilizer rates should be adjusted based on tree condition—trees with weak growth or high production may require more or less depending on previous year’s yield and soil nutrient levels.
To support farmers, the Hebei Fertilizer Association has developed formula fertilizers, designed by experts to meet specific crop needs. These fertilizers are produced under strict quality control and distributed through designated service stations under the "Equilibrium Fertilizer Technology Material Service Station" network, ensuring reliability and effectiveness.
Hebei's top fertilizer and microbial experts have collaborated to create a line of functional fertilizers called "Wholehearted Partners." These products are enriched with essential macro- and micronutrients, organic matter, humic acid, amino acids, proteins, and beneficial bacteria. They are specifically formulated to address issues like yellowing leaves, leaf curling, fruit deformities, black heart, rot, and underground pests.
Spring fertilization should be applied before flowering and after fruit set. The main root zone of fruit trees, where absorption is most efficient, lies within the 10–30 cm depth below the canopy edge. Fertilization methods include trench application, spot application, watering after spreading, or rotating tillage following application. However, irrigation should be moderate to avoid overwatering.