Fruit tree application base fertilizer: Generally after the fruit tree leaves fallen in winter, choose granular humic acid. The organic matter content is more than 50%, the humic acid content is more than 30%, 300-400kg per 665㎡.
Or the organic-inorganic compound fertilizer with high humic acid. The organic matter content 30%, the humic acid content is more than 20%. Nitrogen, phosphorus and potassium content is about 20%. And 200-300 KGDS per 665㎡.
Humic acid organic-inorganic compound fertilizer has sufficient nutrients and comprehensive nutrition. Which can meet the nutrients needed for the growth and germination of fruit trees. The fertilizing position was at the edge of the crown projection. And the trench was dug at the edge of the crown projection by the method of trench fertilization or hole fertilization.
Because the bottom of the crown is also the densest place of root distribution. Fertilizing on the edge of the crown will not hurt the root system. But also conducive to the absorption of fertilizer. Tree crown, the aged of the tree dug two times. The depth of 20 – 40cm. Fertilizer can not be buried too shallow. Too shallow is not conducive to root absorption. After fertilizing and burying, it should be fully watered to facilitate the absorption of fruit trees.
Fruit tree topdressing: when the fruit tree grows to the fruit expansion stage, the granular humic acid organic-inorganic compound fertilizer with nitrogen, phosphorus and potassium content of about 25% – 30% is selected. And 80-160 kg per 665㎡. 30% nitrogen, phosphorus and potassium humic acid compound fertilizer can also be selected to apply for flushing fertilization. Irrigating root along ditch, so that the fruit tree absorbs well and the effect is fast.