This trial was realized in the greenhouses of Uludağ University Yenişehir Vocational School between 2009 and 2010 to investigate effects of water deficit on yield and quality parameters of onion during four crop growth stages. In this trial, fourteen irrigation treatments in four growth periods (establishment, vegetative, yield formation and ripening) of onion (Allium cepa L E.T Grano.502) were constituted and the yield and quality parameters found from these treatments were evaluated. The layout of the experiment was a completely randomized block design with three replications for each of the fourteen irrigation treatments tested. According to the content of the treatments, the irrigation amount water applied to the plants varied between 0 and 436 mm in the first year, and between 0 and 448 mm in the second year. Water consumption of onion in the first year ranged between 205 and 496 mm and in the second year ranged between 210 and 502 mm. Yield, bulb weight, diameter, height and dry matter ratio were determined statistically significant. In 2009 and 2010 years, the maximum yield were found as 52.2 t ha-1 and 52.4 t ha-1 in E100V100Y100R100 treatments, while the minimum yield were found as 0.8 t ha-1 and 0.5 t ha-1 in the E0V0Y0R0 treatments, respectively. Water- yield relationship factors (ky) in 2009 and 2010 years were found as 1.03 and 1.04, respectively. The maximum WUE and IWUE values were obtained from establishment and ripening periods. Establishment and ripening periods may be suggested as the maximum efficient irrigation periods for the onion applied with drip irrigation under unheated greenhouse conditions.

No abstract

No abstract

In this study, management transfer of the Bursa-Mustafakemalpaşa irrigation scheme, located in western Turkey, was assessed. The study was carried out in two stages. In the first stage, the irrigation management transfer programme was assessed using two performance indicators for six years before and after the transfer during the period 1992-2004. According to the results, the relative water supply and irrigation ratio were calculated as 1.5-1.6, 58-62% average values for the years before and after transfer, respectively. It means that relative water supply has not shown any important change before and after the transfer and stays within reasonable levels. On the other hand, although it is not a significant change, the irrigation ratio has increased around 4% after the transfer, which is a reasonable improvement. In the second stage, effects of the transfer were tested and assessed by the Logit model taking farmers perceptions concerning pre-and post-transfer. The probability of the changes in adequacy of irrigation water supplied to the farm, in fairness of water distribution within the system, in frequency of water distribution conflicts, in timeliness of water delivery to the farm, in irrigation fee policy, and in maintenance of drainage canals is significant at the 0.01 level. Also, maintenance of irrigation canals and water control and distribution structures has a positive effect on agreement or disagreement, but is not significant statistically. Adequacy, fairness and timeliness of water distribution regarding irrigation services given by the Mustafakemalpaşa Water Users' Association are not sufficient. Therefore, frequency of water distribution conflicts increased after the transfer. Copyright RÉ SUMÉCet article étudie le transfert de gestion du périmètre irrigué de la ville de Mustafakemalpaşa dans le département de Bursa, à l'ouest de la Turquie. Cette étude a été réalisée en deux étapes. Dans la première, le transfert de gestion a été évalué à l'aide de deux indicateurs de performance sur la période 1992-2004, soit 6 ans avant et 6 ans après le changement. Les ratios moyens calculés pour l'approvisionnement en eau et pour l'irrigation ont été respectivement de 1,5-1,6 et de 58%-62% avant et après le transfert. Ceci signifie que l'approvisionnement en eau n'a pas été affecté par le transfert. En revanche, bien qu'il ne s'agisse pas d'un changement significatif, le ratio d'irrigation a augmenté de l'ordre de 4% après le transfert, une amélioration raisonnable. Dans la seconde étape, les effets du transfert ont été testés et évalués par le modèle Logit qui prend en considération la perception des irrigants avant et après le transfert. La probabilité des changements dans l'adéquation des quantités d'eau d'irrigation livrées aux IRRIGATION AND DRAINAGE Irrig. and Drain. 57: 15-22 (2008)

No abstract