Browsing by Author "Kanber, R."

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Determination of the Amount of Irrigation Water and Interval for Cotton With the Pan-Evaporation Method
(TUBITAK, 2000) Ertek, A.; Kanber, R.
This study was conducted to determine the amount of irrigation water and interval of cotton irrigated by the drip system with the pan-evaporation method. The amount of irrigation water applied was based on free surface evaporation from a screened Class-A Pan. Irrigation treatments consisted of two different irrigation intervals (11: 5; 12: 10 days), and three plant-pan coefficients (Kcp1: 0.75, Kcp2: 0.90, Kcp3: 1.05) and two different wetted percentages (P1: 0.70 and P2: based on the cover percentage of the crop). According to the results, seasonal irrigation water varied from 322 to 472 mm; seasonal Et was 449 to 615 mm; and the cotton yield varied from 1970 to 4220 kg per hectare. Although the effect of irrigation intervals and wetting percentages on cotton yield were not significantly different, plant-pan cofficients in the first year and P-Kcp interaction in the second year were significantly different at a 5 % level among the treatments. The results revealed that cotton can be irrigated with drip systems using a 10 day interval, Kcp 0.90 or 1.05 (mean: 1.00) and P based on the actual cover percentage of the crop.
Determination of the Effects of Different Irrigation Programs on Water Consumption in Different Soil Layers and Root Growth of Cotton
(TUBITAK, 2000) Ertek, A.; Kanber, R.
This study was conducted to determine of the effects of different irrigation programs on water consumption in different soil depths and root growth of cotton. The amount of irrigation water applied was based on free water surface evaporation from a screened Class-A Pan. Irrigation treatments consisted two different irrigation intervals (11: 5; 12: 10 days), and three plant-pan cofficients (Kcp1: 0.75, Kcp2: 0.90, Kcp3: 1.05) and two different wetted percentages (P1: 0.70 and P2: based on cover percentage of crop). According to results it was determined that plant water consumption of 42% and root growth of 65% were in 30 cm soil layer. The plant water consumptions and root growth were affected by irrigation intervals, plant-pan cofficients and wetted percentages. On the other hand, under the same conditions, when drip irrigation was used, wetted depth for cotton may be 108 cm.
Effects of Different Irrigation Programs on the Growth of Cotton Under Drip Irrigation
(TUBITAK, 2001) Ertek, A.; Kanber, R.
This study was conducted to determine of effects the cotton plant growth of different irrigation programs in a drip system. The amount of water applied was based on free surface evaporation from a screened Class-A Pan. Irrigation treatments consisted of two different irrigation intervals (11: 5: 12: 10 days), and three plant-pan coefficients (Kcp1: 0.75: Kcp2: 0.90 and Kcp3: 1.05) and two different wetted percentages (P1: 0.70 and P2: based on cover percentage of the crop). The first irrigation was applied when the available soil moisture in the 120 cm depth in the profile was at 40%. According to the results of the experiment, significant relationships between plant height, leaf area index (LAI), development of plant cover, and dry matter both with irrigation water and evapotranspiration were determined.
Water-Use Efficiency (Wue) and Change in the Yield-Response Factor (Ky) of Cotton Irrigated by an Irrigation Drip System
(TUBITAK, 2001) Ertek, A.; Kanber, R.
This study was conducted to investigate the effect of water-use efficiency and changes in the yield-response factor of cotton irrigated with an irrigation drip system. The amount of water applied was based on free surface evaporation from a screened Class-A Pan. Irrigation treatments consisted of two different irrigation intervals (11: 5: 12: 10 days), three plant-pan coefficients (Kcp1: 0.75: Kcp2: 0.90, Kcp3: 1.05) and two different soil surface wetting percentages (P1: 0.70 and P2: based on cover percentage of the crop). The first irrigation was applied when the available soil water content in the 120 cm of the soil profile was 40%. The results revealed that total water use efficiency (TWUE) and irrigation water use efficiency (IWUE) varied from 0.58 to 0.62 kg/da/mm and 0.755 to 0.94 kg/da/mm, respectively. The ratio of irrigation water measured to evapotranspiration (1/ET) was 67 - 72.5%. The seasonal Ky value of cotton was 0.70. It can be concluded that under similar climate conditions, relative irrigation efficiency values can be used for planning drip irrigation, and relative yield decrease in cotton against deficit irrigation water can be estimated by using the yield-response factor (1 - Y / Ym) = 0.70 (1 - ET / ETm).