How to determine the reasonable amount of fertilizer application
The amount of fertilizer applied to walnut is determined according to the nutrient status of soil and the nutrient requirements of walnut trees. In addition, soil pH, topography, topography, soil temperature and humidity, and soil management have an impact on the amount and method of fertilization. To determine a reasonable amount of fertilizer is to make use of fertilizer economically and effectively without excess.
Picture: Walnut
In order to maintain the balance of elements needed by trees, the reasonable amount of fertilizer should be determined on the basis of nutritional diagnosis.
Reasonable amount of a certain element = (biological yield X average content of the nutrient in the plant-soil supply) ÷ nutrient utilization rate in fertilizer
If the conditions for nutritional diagnosis are not available, the amount of fertilizer can also be determined based on empirical values.
According to the growth and development of walnut trees, soil fertility and different cultivation management levels, reference fertilizer rates for early-bearing and late-bearing walnut trees were proposed in China. On the soil with medium fertility, calculated according to the vertical projection (or crown width) area of tree crown, the effective components of nitrogen 50g, phosphorus and potassium 10g per square meter per year are applied 1 - 5 years after planting of late-fruiting walnut, nitrogen 50g, phosphorus and potassium 20g per square meter per year and organic fertilizer 5kg per square meter per year are applied within 6 - 10 years. Early bearing walnut fruit early, nutrition consumption, fertilizer should be more than the same age late bearing walnut, 1~10 years old, per square meter of annual application of effective components nitrogen 50 grams, phosphorus, potassium 20 grams, organic fertilizer 5 kg. 20~30 years old walnut trees per plant of organic fertilizer is generally not less than 200 kg. If soil conditions are poor, tree growth is weak and yield is high, the amount of base fertilizer should be appropriately increased. Green manure can be widely planted and utilized in areas with insufficient fertilizer sources.
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The key to scientific fertilization is to accurately judge the surplus and deficiency of nutrient elements and tree nutrients in the soil. The basis of fertilization includes morphological diagnosis and nutrition diagnosis. Morphological diagnosis is to preliminarily judge the amount of nutrient elements according to the external morphological characteristics of fruit trees.
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