Yazar "Dogan E." seçeneğine göre listele

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    Drought stress imposed at different reproductive stages influences growth, yield and seed composition of soybean
    (University of the Philippines at Los Banos, 2008) Kirnak H.; Dogan E.; Alpaslan M.; Celik S.; Boydak E.; Copur O.
    Soybean (Glycine max L.) was grown in 2003 and 2004 to determine the effect of deficit irrigation given at five different reproductive stages on its growth, yield and seed composition. All soybean plots received full irrigation during the vegetative stage, while treatments were started during one of the reproductive stages (R1-2, beginning of flowering and full bloom; R3, beginning of pod; R4, full pod; R5, beginning of seed; R6, full seed and full irrigation) by completely stopping irrigation. In 2003 and 2004, the observed leaf area index ranged from 3.9 (R6) to 2.6 (control), and from 4.0 (R6) to 2.7 (control), respectively. Water stress resulted in reduced vegetative growth, leaf relative water content and leaf chlorophyll content. In 2003 and 2004 seed yields ranged from 1955 (R6) to 3684 kg ha1 (control), and from 1867 (R6)to 3952 kg ha-1 (control), respectively. Any water stress imposed on soybean plants in R3, R5 and R6 resulted in substantial yield reduction compared with the full irrigated control treatment. There were no significant effects of total chlorophyll and leaf relative water content on the oil and protein content of soybean seed. Water stress during the different reproductive stages (R 1-R6) significantly affected protein content, C18:0, C18:2 and C18:3 fatty acids. The lowest protein value was obtained in R 1-2, while the highest values were obtained from R4 in both years. Water stress effect imposed on any of the reproductive stages showed a significant effect on protein content but not seed oil. The highest protein content values were obtained from R4 treatment at 42.5% and 42.1 % in 2003 and 2004, respectively, while the lowest values were from R5 and R1-2 at 37.9% and 38.9% in 2003 and 2004, respectively. Average seed oil content in 2003 and 2004 were 14.61% and 16.12%, respectively.
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    Effects of irrigation, soil compaction and fertilization treatments on physiological-vegetative characteristics and root development of soybean
    (Agricultural Research Communication Centre, 2016) Kirnak H.; Gokalp Z.; Dogan E.; Çopur O.
    The present study was conducted to investigate the effects of different soil compaction levels (non-compacted control, low compaction, high compaction), irrigation management practices (conventional furrow and alternate furrow) and nitrogenous fertilizer levels (60, 90, 120 kg ha-1) on vegetative characteristics (dry biomass production, plant height, number of branch and number of pod per plant, height of the first pod, leaf area index, stem diameter), physiological characteristics (leaf relative water content, leaf chlorophyll content and leaf temperature) and root development through 0-80 cm soil profile of soybean grown in Harran Plain of Turkey. Experiments were conducted in Sanliurfa Province of Turkey in split-split plots experimental design with 3 replications during the years of 2006 and 2007. Irrigation program was created by using KanSched simulation model. The amount of applied irrigation water in conventional and alternate furrow systems in 2006 and 2007 were measured as 435.61 and 291.59 mm, and 429.51 and 271.72 mm, respectively. While the highest yield (947.8 kg ha-1) was observed in control treatment of the year 2006, conventional furrow system had the highest yield (2099.3 kg ha-1) in the year 2007. Soil compaction, irrigation and nitrogenous fertilization in general had significant effects on entire vegetative characteristics investigated in the present study. Increasing compaction levels yielded decreasing plant height, stem diameter and leaf area indexes. Biomass production increased with increasing nitrogen doses. Results indicated that negative impacts of soil compaction in agricultural fields due to traffic and various other reasons could be eliminated with proper irrigation and fertilization implementations. © 2016, Agricultural Research Communication Centre. All rights reserved.
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    Green pea response to deficit irrigation rates under semi-arid climatic conditions
    (National Centre for Agrarian Sciences, 2015) Dogan E.; Rat I.; Kahraman A.; Ipek I.S.
    A study was carried out in the 2008 and 2009 cropping seasons, to determine the supplemental irrigation effect on yield and yield components of green pea under the semi-arid climatic conditions of Harran Plain, Sanliurfa, Turkey. Irrigation treatments included I0 (dryland), I25, I50, I75, I100 (full irrigation), and I125 (over irrigation) and scheduled based on soil moisture measurements. Annual precipitation was about 200 mm in first year and 275 mm in the second year. In addition, the full irrigation treatment plot received 235 and 195 mm in respective years. Almost all of the measured crop parameters including number of pod per plant, 1000- seed weight, biomass and seed yield parameters were increased by irrigation treatments up to full irrigation except number of branch as per plant. Biomass values ranged in general from 5500 (dry land) to 11500 (fully irrigated) kg ha?1, while seed yield varied from 1300 (dry land) to 3450 (full irrigated) kg ha?1. Therefore it is recommended to fully irrigate the green pea crop for optimum biomass and seed yield when irrigation water is available. Otherwise, considerable yield reduction can be anticipated. © 2015, National Centre for Agrarian Sciences. All rights reserved.