Fertilization Methods and Key Technical Points for Kiwifruit During the Fruit Enlargement Stage
During the enlargement stage, kiwifruit needs sufficient nutrients and water. At this time, scientific and reasonable topdressing plays an extremely important role in improving the yield and quality of kiwifruit. So how should kiwifruit be fertilized during the enlargement stage? Let's find out together with the editor.
1. Fertilizer Requirements and Characteristics
For kiwifruit, the uptake of nitrogen fertilizer accounts for 53 of the annual nitrogen requirement, the uptake of phosphorus accounts for 55% of the annual phosphorus requirement, and the uptake of potassium accounts for 53% of the annual potassium requirement. This period is the peak period of kiwifruit's absorption of nitrogen, phosphorus and potassium, and also the period of maximum efficiency for kiwifruit's demand for nitrogen, phosphorus and potassium and other elements. This kind of topdressing should follow the combined application of formula fertilizer and bio-organic fertilizer, keeping the fertilizer uniform, and it is not advisable to apply only one of them, so as to avoid affecting the normal enlargement of the fruit.
2. Fertilizer Types
Kiwifruit topdressing is generally divided into high-nitrogen, high-phosphorus and high-potassium fertilizers applied in combination with bio-organic fertilizer. A compound fertilizer with a nitrogen-phosphorus-potassium content ratio of 4:2:4 can also be selected. Farmers can also purchase urea, diammonium phosphate and potassium chloride themselves and prepare and apply the fertilizer in a certain proportion.
3. Fertilization Amount
Fertilization during the kiwifruit enlargement stage should be determined according to the orchard. For 8-12 year old full-bearing orchards, apply 3.5-5 kg of fertilizer per tree; for fruit trees over 13 years old, apply 4-6 kg per tree. For 5-7 year old orchards just beginning to bear fruit, apply 2-3.5 kg of fertilizer per tree; for 4-year-old trees, apply 1.5 kg per tree; for newly transplanted young trees, apply 0.2 jin of diammonium phosphate + 1-2 jin of bio-organic fertilizer per tree.
4. Application Method
Fertilization during the enlargement stage can be carried out beyond two-thirds of the distance from the canopy, that is, in full-bearing orchards, 60-100 cm from the main trunk, by applying fertilizer in holes or in radial trenches, then covering with soil. It is best not to broadcast or band apply, and do not use mechanical fertilization.
5. Post-Fertilization Management
After fertilization, whether to irrigate should be decided according to soil moisture conditions. If irrigation is needed, it is recommended to use a plastic hose for irrigation. If the orchard has sprinkler or drip irrigation facilities, it is best to choose sprinkler or drip irrigation, and do not use flood irrigation.
The above is an introduction to how to fertilize kiwifruit during the enlargement stage. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.