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| Determination of optimal fertilizer quantities based on nutrient removal in kiwi vines: A case study of Yujiahe catchment, in Zhouzhi County |
| Received:February 22, 2021 |
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| KeyWord:kiwi orchard;nutrient content;nutrient uptake;fertilization |
| Author Name | Affiliation | | LU Yongli | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070, China | | ZHOU Jianbin | College of Natural Resources and Environment, Northwest A&F University/Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | | HAI Long | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070, China | | GAO Jingbo | College of Natural Resources and Environment, Northwest A&F University/Key Laboratory of Plant Nutrition and the Agri-Environment in Northwest China, Ministry of Agriculture and Rural Affairs, Yangling 712100, China | | ZHANG Chunhong | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070, China | | LI Linzhi | College of Resources and Environmental Sciences, Gansu Agricultural University, Lanzhou 730070, China | | FENG Jiayu | People's Government of Baoji Town, Pingchuan District, Baiyin 730913, China |
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| Abstract: |
| The objective of this study was to determine the annual nutrient requirement of kiwi vines by quantifying their nutrient content and uptake during the annual growth cycle, providing a scientific basis for rational fertilization in kiwi orchards. The different kiwi vine organ samples were collected during the annual kiwi vine growth cycle, the nutrient content was analyzed, and the nutrient uptake by the different organs was calculated. The recommended fertilization amount for kiwi orchards was then calculated in Yujiahe catchment based on the nutrient storage capacity of mature orchards. The results indicated no significant differences in the fruit yield, single fruit weight, single-leaf weight, leaf number, and branch pruning among the three kiwifruit varieties in the research area. Moreover, no significant differences could be observed in the N, P, and K nutrient contents in the various organs and in the fruit yield, leaf number, and branch pruning. In the kiwifruit orchard, 2.81, 0.31, and 2.13 g N, P, and K were absorbed by 1 kg leaves, 1.40, 0.47, and 2.23 g N, P, and K were removed by the harvest of 1 kg fresh fruits, and 3.70, 0.47, and 2.94 g N, P, and K were removed by the pruning of 1 kg branches, respectively. During the annual growth cycle, the total N, P, and K nutrient uptake from leaf absorption, fruit harvest, branch pruning, and tree storage were 162, 36, and 146 kg·hm-2·a-1, respectively, among which the applied fertilizer-derived nutrients were 38.0, 5.4, and 20.0 kg·hm-2·a-1, respectively. In conclusion, the different kiwifruit varieties could be fertilized using the same recommended fertilizer quantities comprising 380 kg·hm-2·a-1 of N, 77 kg·hm-2·a-1 of P, and 87 kg·hm-2·a-1 of K, with the N, P2O5, K2O ratio of 1:0.5:0.3. |
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