June apple topdressing technology method
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Topdressing method: Topdressing includes rhizosphere topdressing and root dressing. It should be emphasized that although foliar spray fertilizer has many advantages and is increasingly valued, it is not a substitute for soil topdressing. Because the absorption and utilization of fertilizer by leaves is limited, most of the nutrients needed for the tree still need to be supplied by soil fertilization. If the soil moisture is suitable during the topdressing of the rhizosphere, the strip application or the annular fertilization method may be adopted, and the orchard with difficulty in water supply to the drought and flood should be promoted.
The types used in top dressing are mainly phosphorus and potassium fertilizers, supplemented by nitrogen fertilizer. The amount of top dressing is the same as conventional top dressing.