This method is commonly used for young trees in the ring groove, and it can be combined with deep turning points. The fertilization method is based on the trunk, about 60 cm from the trunk (varies according to the size of the crown) digging a ring groove, groove depth 40 to 50 cm, width 20 to 30 cm, after the organic fertilizer and soil mix Enter, then cover the earth. With the expansion of tree age and canopy, the annular groove expands year by year.
Strips of furrows are applied to the trees at a distance of about 60 centimeters (depending on the age of trees and the size of the canopy) or on both sides of the trunk to dig a trench or to divide fertilization in rows. The depth of the trench is 40 to 50 cm and the width is 30 to 50 cm. Replace groove direction and position.
Acupoint application of this method is often used in the case of organic fertilizer deficiency. About 60 cm from the trunk (around the canopy), dig 4 to 6 points deep and 40 to 50 centimeters in diameter and 30 to 40 centimeters in diameter. Then mix soil and fertilizer in a 3:1 ratio and mix well and fill in the hole. The number depends on the size of the crown, and the orientation of the hole rotates every year.
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