|Author:||Sezen, S. Metin ; Dasgan, H. Yildiz ; Gencel, Burcin ; Yazar, Attila ; Akyildiz, Asiye|
|Book Group Author:||NA|
The effects of different irrigation regimes on yield and quality of green beans (Phaselous vulgaris L.) irrigated with a drip irrigation system under field conditions in the Mediterranean region of Turkey were evaluated along two years. Irrigation regimes consisted of four irrigation intervals based on four levels of cumulative pan evaporation (Epan) values (I ₁: 15; I ₂: 30; I ₃: 45 and I ₄: 60mm); irrigations occurred on the respective treatments when Epan reached target values, and three plant-pan coefficients as for irrigation levels (Kcp₁ =0.50, Kcp₂ =0.75 and Kcp₃ =1.00). Irrigation intervals varied from 2 to 4 days in I ₁, 5 to 7 days in I ₂, 8 to 10 days in I ₃ and 10 to 12 days in I ₄ treatments in 2004 and 2005 growing seasons Both irrigation levels and intervals significantly affected the green bean yields. Maximum and minimum yields were obtained from the I ₁Kcp₃ and I ₄Kcp₁ treatments as 24,320 and 14,200kgha⁻℗£ in the first, and 23,850 and 13,210kgha⁻℗£ in the second experimental year, respectively. As the Kcp value decreased the total yields in each irrigation interval also decreased. However, with the longer irrigation interval (I ₄), lower yields were obtained with all Kcp coefficients. Seasonal water use (ET) values in the treatments varied from 276mm in I ₄Kcp₁ to 400mm in I ₁Kcp₃ in the first experimental year, and from 365mm in I ₄Kcp₁ to 472mm in I ₁Kcp₃ in the second experimental year. Significant linear relations were found between green bean yield and seasonal ET for each experimental year. Irrigation intervals resulted in similar water use in the treatments with the same Kcp value. Water use efficiency (WUE) and irrigation water use efficiency (IWUE) values were significantly influenced by the irrigation intervals and plant-pan coefficients. WUE ranged from 4.33kgm⁻℗đ in I ₄Kcp₃ to 6.08kgm⁻℗đ in I ₁Kcp₃ in 2004, and varied from 3.62kgm⁻℗đ in I ₄Kcp₁ to 5.43kgm⁻℗đ in I ₂Kcp₂ in the 2005 growing season. Maximum IWUE was observed in I ₂Kcp₁ (6.16kgm⁻℗đ), and minimum IWUE was in I ₄Kcp₃ treatment (3.83kgm⁻℗đ) in the experimental years. Both irrigation levels and irrigation frequencies had significantly different effects on quality parameters such as fresh bean length, width, number of seed per pod and 100 fresh bean weights. In conclusion, I ₁Kcp₃ irrigation regime is recommended for field grown green beans under the Mediterranean conditions in order to attain higher yields with improved quality.
|Pages:||95 - 102|
water use efficiency, evapotranspiration, irrigationscheduling, seed set, irrigation rates, evaporation, yield components,field experimentation, vegetable crops, green beans, Phaseolus vulgaris,crop yield, deficit irrigation, microirrigation, crop quality, Turkey(country)