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    Effects of different drip irrigation levels on yield and some agronomic characteristics of raised bed planted corn
    (Academic Journals, 2011) Bozkurt, Sefer; Yazar, Attila; Mansuroglu, Gulsum Sayilikan
    This study was carried out to determine the effects of different irrigation levels on water use, yield and some agronomic parameters of drip-irrigated corn under the Eastern Mediterranean climatic conditions in Turkey. In the trials, irrigation water was applied as I-20: 20%, I-40: 40%, I-60: 60%, I-80: 80%, I-100: 100% and I-120: 120% of evaporation from a Class A Pan. The seasonal total irrigation water ranged from 55 to 381 mm and seasonal crop water use varied from 365 to 584 mm in different treatments. Irrigation levels significantly affected yield and yield contributing parameters at P<0.01 level. The average corn grain yields varied from 1.93 to 10.4 t ha(-1). The highest grain yield and yield components were found in I-120 while the lowest were found in I-20 treatment. Irrigation levels had statistically significant effect on fresh and dry above ground biomass production of corn at P<0.01 level. The highest water use efficiency (1.77 kg m(-3)) value was found in I-120 treatment. Seasonal yield response factor (ky) was 1.98 in the experiment.
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    The effects of drip line depths and irrigation levels on yield, quality and water use characteristics of lettuce under greenhouse condition
    (Academic Journals, 2011) Bozkurt, Sefer; Mansuroglu, Gulsum Sayilikan
    This study was conducted to investigate the effects of different drip irrigation methods and different irrigation levels on yield, quality and water use characteristics of lettuce (Lactuca sativa var. longifolia cv. Lital) cultivated in a solar greenhouse from 07 October 2009 to 03 December 2009 in the Eastern Mediterranean region of Turkey. The irrigation methods were consisted of traditional surface drip irrigation (TDI), subsurface drip irrigation at 10 cm drip line depth (SDI10) and subsurface drip irrigation at 20 cm drip line depth (SDI20). At the treatment of irrigation levels, five irrigation treatments (I) were based on adjustment coefficients (0.25, 0.50, 0.75, 1.0 and 1.25) of Class A pan evaporation. For the yield and quality parameters of plant; marketable head weight (yield), number of marketable leaves, leaf area, plant height and diameters, plant dry weight, core diameters and firmness of head, leaf chlorophyll content, total soluble solids (TSS as degrees Brix), electrical conductivity (EC), pH, total dissolved solids (TDS) and salinity of leaves' juice were determined. The yield and yield components were not affected by the irrigation methods except for core and plant diameters. Irrigation levels had significantly (p < 0.01) different effects on yield and yield components except for plant dry weight, plant height and head firmness. The results showed that the highest yield was obtained from SDI(10)xI(100) treatment. The water use efficiency (WUE) and the irrigation water use efficiency (IWUE) increased as the irrigation was reduced.
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    Responses of unheated greenhouse grown green bean to buried drip tape placement depth and watering levels
    (Elsevier Science Bv, 2018) Bozkurt, Sefer; Mansuroglu, Gulsum Sayilikan
    Subsurface Drip Irrigation (SDI) is a professional water distribution system for improved crop water use and conserving water. Selecting drip tape installation depths for different crops is the most critical decision with these systems. Hence, the aim of this research was to examine the effects of different SDI depths and water amounts on the yield components and water use characteristics of green bean crop under unheated greenhouse conditions during two crop-growing cycles. Three irrigation methods [Traditional Drip Irrigation (DI), SDI at 10 cm soil depth (SDI10) and SDI at 20 cm soil depth (SDI20)] and six irrigation water levels (I) based on crop-pan coefficients (I-20:K-cp=0.20, I-40:K-cp=0.40, I-60:K-cp = 0.60, I-80:K-cp = 0.80, I-100:K-cp = 1.00 and I-120:K-cp = 1.20) were evaluated. In each growing cycle, adequately watered crops (I-100) were accepted as control. The seasonal evapotranspiration changed from 235 to 374mm in autumn and from 270 to 566 mm in spring season. Different placement depths of drip tape had significant effects on green bean yields in spring growing cycle. Maximum yield (5.97 kgm(-2)) was obtained in SDI10 irrigation method. Irrigation water levels also significantly (p< 0.001) affected green bean yield in both growing cycles. The highest yield (1.66 kg m(-2) in autumn and 6.81 kg m(-2) in spring) was obtained in I-100 treatment. SDI techniques improved Water Use Efficiency (WUE) and Irrigation Water Use Efficiency (IWUE). The values of WUE and IWUE increased as the watering level was reduced. Maximum yield response factor in DI method in autumn and spring seasons (Ky) was found as 0.96 and 1.66, respectively. General evaluation of the water management, crop yield components and growth variables showed that the SDI10I100 treatment appears to be the most favorable irrigation practice for the green bean grown under greenhouse conditions. Water savings of up to 13% of seasonal irrigation water could be achieved using SDI method. (c) 2017 Elsevier B.V. All rights reserved.