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Omidi H.,Shahed University | Tahmasebi Z.,Tarbiat Modares University | Naghdi Badi H.A.,Institute of medicinal Plants and Natural Products Research | Torabi H.,Shahed University | Miransari M.,Shahed University
Comptes Rendus - Biologies | Year: 2010

Vegetable oils with a high relative amount of unsaturated fatty acids are of great significance for human health. There is not any data on the effects of tillage practices on fatty acid composition of canola (Brassica napus L.). Hence, in a 2-year split plot experiment, the effects of different tillage systems (no (NT), minimum (MT) and conventional tillage (CT)), canola genotypes (Hyola 401 (V1) and PF (V2)) and sowing dates (including Sep. 8, 23 and Oct. 7) on the fatty acid composition of canola were evaluated. Tillage practices and the combination of canola genotypes and sowing dates were randomized to the main and sub-plots, respectively. The highest oleic acid content was the result of combining NT, V1 and Sep. 23, and the lowest was related to the combination of CT, V2 and Oct. 7. While the combination of NT, V1 and D1 resulted in the highest amount of unsaturated fatty acids, this amount was the lowest for the combination of CT, V2 and Sep. 23. For the selection of an appropriate canola producing strategy, all these parameters must be taken into account. The combination of NT, V1 and Sep. 23 may be the most favorable cropping strategy for canola production under a Mediterranean climate. © 2009 Académie des sciences.

Dadrasan M.,University of Tehran | Chaichi M.R.,University of Tehran | Pourbabaee A.A.,University of Tehran | Yazdani D.,Institute of Medicinal Plants and Natural Products Research | Keshavarz-Afshar R.,Montana State University
Industrial Crops and Products | Year: 2015

Fenugreek (Trigonella foenum-graecum L.) is an annual leguminous crop, widely cultivated as a medicinal plant, a high quality forage crop, or a nitrogen (N) fixing cover crop around the world. There is a lack of information about the effect of irrigation and fertilization on growth and yield of this crop, especially in regions with limited water availability. In this study, we evaluated the effects of moderate (I75: 25% saving in irrigation water) and severe deficit irrigation (I50: 50% saving in irrigation water) regimes on forage, seed, and trigonelin yield of fenugreek in a semi-arid environment (Karaj, Iran). We also examined if application of bio-fertilizers (seed inoculation with Azotobacter chroococcum and Peudomoance fluorescence) could substitute the need for chemical N, phosphorus (P), and potassium (K) fertilizer in whole or in part. The field experiment was conducted in 2012 and 2013 in a split plot arrangement based on a randomized complete block design with three replications. Forage yield, seed yield, and trigonelline concentration were significantly influenced by deficit irrigation. Implementation of I75 and I50 resulted in 40 and 65% lower forage yield compared with full irrigation (I100). Averaged over fertilizer treatments and two years, fenugreek seed yield in I100 was 839kgha-1 which declined by 27 and 42% under I75 and I50 treatments, respectively. Accumulation of trigonelline in fenugreek seeds was elevated from 2.9gkg-1 in I100 to 3.1gkg-1 in I50. Fenugreek forage and seed yield, both were significantly improved when integrated fertilizers (biofertilizer+chemical fertilizer) were applied. Among the biological, chemical and integrated fertilizers, fenugreek forage and seed yield best responded to bio+50% chemical fertilizer. The advantage of the integrated fertilizer over chemical fertilizer was even more pronounced when deficit irrigation was practiced. Fertilization had no significant effect on trigonelline concentration According to the results of this study, integration of biofertilizer+50% chemical fertilizer could be successfully used for fenugreek production in this region toward minimizing the consumption of chemical fertilizers and improving fenugreek yield, especially under deficit irrigation regimes. © 2015 Elsevier B.V.

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