| Effect of foliar-applied nitrogen on ‘Fuji’ apple leaf nutrition and aroma compounds and fruit quality |
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| DOI：10.7606/j.issn.1000-7601.2017.05.25 |
| Key Words: foliar-applied urea Fuji apple leaf nutrition apple aroma apple quality |
| Author Name | Affiliation | | LI Ai-mei | College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHANG Chao | College of Life Natural Resources and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China | | LI Ben-sheng | College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHANG Ling | College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHAO Yong-gui | College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China | | HAN Ming-yu | College of Horticulture, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHANG Li-xin | College of Life Sciences, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| Abstract: |
| In order to improve the leaf nutrition levels and fruit quality of apple, Fuji apple was selected to be the experimental material in the experiment. The effects of different nitrogen levels on the dynamic change of the leaves’ nutrients, aroma compounds and quality of Fuji apple were studied by spraying urea in five times of interval with different levels ( 0.2%, 0.5% and 0.8%) from May to September. The results showed that, from young fruit to later expanding period, the content of nitrogen (N) in leaves decreased first, then increased, and finally reached an optimum; phosphorus (P) and potassium (K) content increased at first, then decreased, and finally reached a stable level. The content of N, P and K was improved by foliar-applied urea. N, P and K average content under N2 treatment was 15.68%, 10.37% and 5.6% higher than the control, respectively. Aroma content of apple was increased to a high extent by spraying urea, the nonanal, ethyl acetate and butanoic acid-pentyl ester were appeared after spraying urea, and treatment N2 had best effect，the total amount of aroma components of the treatment N2 increased by 22.29% compared with control(N0). The treatment N2 and N3 significantly enhanced amino acids and titratable acidity, but had no significant effect on soluble sugar and vitamin C. Comprehensive analysis showed that spraying 0.5% urea (N2) could effectively increase the apple leaf nutrients, improve fruit aroma and quality. |
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