| Effects of foliar topdressing nitrogen fertilizer on growth, quality and yield of dwarf densely planted apple |
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| DOI：10.7606/j.issn.1000-7601.2025.02.10 |
| Key Words: dwarf densely planted apple foliar topdressing nitrogen fertilizer urea sophorolipid spraying period |
| Author Name | Affiliation | | YU Cheng | State Key Laboratory for Crop Stress Resistance and High\|efficiency Production, Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A & F University, Yangling, Shaanxi 712100, China | | SU Xinjian | State Key Laboratory for Crop Stress Resistance and High\|efficiency Production, Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZOU Yangjun | State Key Laboratory for Crop Stress Resistance and High\|efficiency Production, Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A & F University, Yangling, Shaanxi 712100, China | | GONG Xiaoqing | State Key Laboratory for Crop Stress Resistance and High\|efficiency Production, Shaanxi Key Laboratory of Apple, College of Horticulture, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| A 6-year-old dwarf self\|rooted apple tree ‘Yanfu 10’ grafted on M26 rootstock was used as the experimental material. The study included 4 spraying periods (germination period, flowering period, young fruit period, and fruit enlargement period) and 2 foliar nitrogen topdressing methods (0.4% urea and 0.4% urea + 5 g·L-1sophorolipid). Trees without foliar nitrogen topdressing in the orchard served as the control, with other management measures remaining standard. In total, 9 treatments were established to investigate the effects of different foliar nitrogen application periods and methods on the growth, quality, and yield of dwarf, high\|density apple trees.The results showed that: compared with the control, the foliar application of nitrogen improved the physiological indicators of fruit trees, fruit quality and yield to some extent. The spraying effect of each period was as follows: flowering period> germination period> young fruit period> fruit enlargement period. At the same spraying period, the treatment of superimposed sophorolipid was better than that of urea alone. At flowering period, compared with urea alone (F3), the treatment of superimposed sophorolipid (F4) significantly increased leaf area (3.75%), weight of 100 leaves(3.34%), relative chlorophyll content (2.33%), total nitrogen content (1.58%), and net photosynthetic rate (7.13%). Single fruit weight, color difference a* value, peel ductility and yield were also significantly increased by 4.00%, 4.63%, 3.37% and 4.00%, respectively. Comprehensively, the spraying effect of 0.4% urea + 5 g·L-1sophorolipid at flowering period was the best. |
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