Because the main roots and big roots of fruit trees near the trunk are under the tree tray, they don't eat water or fertilizer, and fertilization is too close, which is easy to damage the root system and is conducive to the growth of bacteria. Therefore, watering and fertilization should not be too close to the fruit trees, which is also the reason why the orchard should be furrowed and ridged.
Whether digging a pit or ditching for fertilization, applying fertilizer in a ring or radial way, applying fertilizer with a top dressing gun, or applying fertilizer by washing, drip irrigation and infiltration irrigation, we should follow the principle that fertilization should be based on the excircle projected vertically on the crown, because there are a large number of hairy roots of fruit trees here.
Extended data:
For young trees without fruit, with the growth of tree age and the elongation of branches, ring fertilization can be used to expand holes year by year. For mature fruit trees, row fertilization should be used, and single or double row fertilization should be used for hole application or furrow application.
For orchards that have been furrowed and ridged, watering and fertilization will remain in the furrows between rows. As mature fruit trees, the branches on the ground have crossed into hands and the roots on the underground have become intertwined, watering and fertilization can only be carried out between two rows of trees, which is beneficial to the absorption and utilization of water and fertilizer by the roots of fruit trees.
Whether it is water-soluble fertilizer or solid fertilizer, whether it is organic fertilizer or inorganic fertilizer, whether it is gun application, flushing application or spraying, furrow application, hole application or drip irrigation, fertilization must be uniform.