Determination of Crop Water Stress Index (CWSI) and Irrigation Timing by Utilizing Infrared Thermometer Values on the First Corn Grown Under Çukurova Conditions

Authors : Cafer GENÇOĞLAN

Pages : 87-96

View : 10 | Download : 5

Publication Date : 1999-01-01

Article Type : Research Paper

Abstract :This study was carried out to determine crop water stress index insert ignore into journalissuearticles values(CWSI); using the infrared thermometer data; to estimate irrigation time from this index and to obtain yield-CWSI relationships for maize under Çukurova Region conditions. In this research, irrigation water levels were 100% insert ignore into journalissuearticles values(I 100 );, 80% insert ignore into journalissuearticles values(I 80 );, 60% insert ignore into journalissuearticles values(I 60 );, 40% insert ignore into journalissuearticles values(I 40 );, 20% insert ignore into journalissuearticles values(I 20 ); and 0% insert ignore into journalissuearticles values(I 0 ); of water depleted in the 120 cm soil profile in every ten days, so different level of water stress treatments were created. A total of 752 mm and 823 mm of irrigation water were applied to I 100 irrigation treatment, in which water depletion was determined as 999 mm and 1052 mm in 1993 and 1994, respectively. Grain yield obtained from the above mentioned irrigation treatment was 1001.5 kg/da in the first year and 1003.5 kg/da in the second year of the experiment. In the first and second experimental year, non-water-stressed insert ignore into journalissuearticles values(LL); and water-stressed insert ignore into journalissuearticles values(UL); baselines were developed as Tc-Ta=2.9- 2.66 VPD and Tc-Ta=2.41-2.045 VPD; 4.25 o C and 3.50 o C, respectively. The yield reudction threshold CWSI values were determined as 0.21 using the infrared thermometer insert ignore into journalissuearticles values(IRT); readings. Linear relationship was also found between grain yield and CWSI.
Keywords : Turk J Agric For, 23, 1999, , 87 96 Turk J Agric For, vol 23, iss 1