Document Type : Research paper
Authors
- Zohre Rohi Vishekaii 1
- Ali Soleimani 1
- Akbar Hasani 2
- Mahmood Ghasemnezhad 3
- Karamatollah Rezaei 4
- Somaye Kalanaky 4
1 Department of Horticultural Science, University of Zanjan, Zanjan, Iran
2 Department of Soil Science, University of Zanjan, Zanjan, Iran
3 Department of Horticultural Science, University of Guilan, Guilan, Iran
4 Department of Food Science, Engineering and Technology, University of Tehran, Karaj-Iran
Abstract
Different sources of nitrogen fertilizers are being used in olive orchards, of which urea is widely used by olive growers. However, nano-chelated nitrogen (nano-N) is a newly found feature of the fertilizer with very little known information. In the current research, the impact of foliar spray of two nitrogen sources; urea (U) and nano-N on oil content and quality of olive cv. ‘Zard’ during two consecutive seasons were investigated. The olive trees were sprayed with 2.21 g (U1) and 2.95 g (U2), and 6 g nano-N1 and 8 g nano-N2 at several phenological stages of olive tree. The detailed observations showed that U1 significantly increased fruit yield. Monounsaturated fatty acid and the ratio of oleic acid to linoleic acid were increased by the nitrogen treatments, especially with nano-N2, whereas it decreased in the case of saturated fatty acid and polyunsaturated fatty acids. The application of both fertilizer sources improved the leaf mineral compositions as well as the oil quality such as free fatty acids, peroxide activity, K232 and K270 extinction coefficients, the chlorophyll and carotenoid pigments. Total phenolic content of the oil in olive trees sprayed with urea was lower than those treated with nano-N. In contrast, the oil antioxidant capacity was high in those trees treated with nano-N. Overall, the results showed that nano-fertilizer, especially nan-N2 treatment rather than urea, is an effective approach to improve oil quality.
Keywords
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