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vol. 17, nr. 2 (2011)
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Fat content in seeds and fatty acids composition of evening primrose (Oenothera paradoxa) oil depending on mineral fertilisation and soil conditions
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Beata Król
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Department of Industrial and Medicinal Plants, University of Life Sciences ul. Akademicka 15, 20-950 Lublin |
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vol. 17 (2011), nr. 2,
pp. 325-0
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abstract:
The field experiment was carried out in 2002-2003 under diverse soil conditions: on a sandy soil poor in nutrients and with acidic reaction, and on a dusty soil characterised by abundant nutrients and neutral reaction. Mineral fertilisation was applied to both soil types at following NPK rates (kg ha-1): N1 25, P1 11, K1 50; N2 50, P2 22, K2 100; N3 75, P3 33, K3 150.. Plots with no mineral fertilisation were the control (N0P0K0). The influence of mineral fertilisation on yielding of evening primrose depended on the soil properties: on the nutrient-deficient sandy soil, the seed yield increased along with the fertilisation rate applied, while on the dusty soil only the lowest NPK rate caused a significant increase of yielding as compared to the control. Higher NPK amounts contributed to a decrease in the yield. Soil conditions greatly determined the seed yields which were over 1.5-fold higher on the nutrient-abundant silty soil than on the sandy soil. Increasing mineral fertilization caused a drop of fat and γ-linolenic acid on both soil types tested. The evening primrose seeds accumulated more fat (22.6% on average) on sandy than on dusty soil (mean 21.6%). The percentage of other fatty acids was only slightly determined by the soil and nutrition factors.
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keywords:
evening primrose, Oenothera paradoxa, mineral fertilisation, soil, yield, oil, fatty acid
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original in:
Polish
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