الفهرس 
The effect of irrigation frequency and rates on green bean under trickle irrigation in clay loam soil
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Abstract
This study was conducted over 2 years (2013 and 2014) to establish the optimal combinations between irrigation frequency and rate for trickle irrigated green bean using water production functions and water use-yield relationships. A field experiment was conducted using a randomized complete block design with three irrigation frequencies (F1, F2 and F3, irrigation events once every 1, 2 and 3 days, respectively) and three trickle irrigation rates (I1: 1.00, I2: 0.80, and I3: 0.60 of the estimated crop evapotranspiration, ETC). Our results showed that yield and WUE increased with increasing irrigation frequency. Seasonal crop ETc of green bean varied from 163 mm in F1I3 to 327 mm in F3I1 treatments on 2013 and from 164 mm in F1I3 to 328.72 mm in F3I1 treatments on 2014. The maximum and minimum yield of 12030 and 4879 kg ha-1 were obtained in F1I2 and F3I3, respectively, in 2013, while in 2014, similar to the previous year, maximum and minimum yield were obtained from F1I2 and F3I3 as 12364 and 4678 kg ha-1, respectively. WUE ranged from 5.65 kg m-3 in F1I2 to 2.38 kg m-3 in F3I3. Seasonal yield response factors (ky) were 0.845 and 0.856 in 2013 and 2014, respectively. Production functions of yield versus seasonal crop ETc were power for all combinations of irrigation frequency and rate for both growing seasons. The relationship between WUE and yield was best represented by a power equation. In conclusion, F1I2 irrigation treatment is recommended for field grown green bean in order to achieve higher yield and WUE