Fruit trees in the full fruit period not only provide fertilizer for the growth of trees, but also provide sufficient nutrition for the growth of fruits. The growth of big cherry fruit needs more potassium, so the application amount of potassium fertilizer should be increased. Apply 30 ~ 40 kg of soil miscellaneous fertilizer or 2 ~ 4 kg of biological organic matter to each plant, and appropriately increase the application of potassium fertilizer.
Spraying 1~2 times of 0.5% urea +0.5% boron fertilizer or 600 times of potassium dihydrogen phosphate solution on leaves at the initial flowering stage can increase fruit setting. After flowering, urea and various trace fertilizers are sprayed every 10~ 15 for 5~7 times continuously to supplement urgently needed nutrients and reduce fruit drop.
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Topdressing after fruit picking
After fruit picking, the tree lacks nutrition and loses its original balance, which needs to be adjusted urgently to form a new balance. At this time, it is in the second growth period of cherry blossom bud differentiation and new shoots.
In order to produce more photosynthetic products and form high-quality flower buds, quick-acting fertilizers with high phosphorus content should be applied immediately after fruit harvesting, such as decomposed human feces, bean cakes and compound fertilizers 1 time.
The amount of fertilization can be determined according to the age of the tree, the size of the crown and the number of fruits. 60 ~ 80kg of decomposed human excrement, 2.5 ~ 3kg of decomposed bean cake, 0.5kg of ammonium sulfate/kloc-0, or 0.5 ~ 1 kg of urea can be applied to plants or sprayed on leaves.