The effects of irrigation water salinity on eggplant growth, yield, water consumption and mineral matter accumulation in leaves and fruits were investigated with a greenhouse experiment. For this purpose, five saline irrigation waters with electrical conductivities of 1.5, 2.5, 3.5, 5.0, 7.0 dS m À1 and tap water as a control treatment were utilized. Throughout the experiment, the amounts of irrigation water to be applied were determined based on the weight changes of each pot. After irrigation the amount of drainage water volume was measured in drain pans placed underneath each pot. We calculated the plant water consumption from the water budget information. Threshold soil salinity and slope values of the yield response to soil salinity level were determined as <1.5 dS m À1 and 4.4 respectively for fruit yield and 6.7 dS m À1 and 3.7 for the vegetative dry weight. The fruit yield results revealed that eggplant was moderately sensitive to salinity. Plant water consumption and water use efficiency decreased with increasing salinity. The crop yield coefficient (K y ) was 2. RÉ SUMÉLes effets de la salinité de l'eau d'irrigation sur la croissance de l'aubergine, le rendement, la consommation d'eau et l'accumulation de matières minérales dans les feuilles et les fruits ont été étudiés dans une expérience sous serre. À cette fin, cinq niveaux de salinité ont été utilisés avec une conductivité électrique de 1,5, 2,5, 3,5, 5,0, 7,0 dS m À1 et l'eau du robinet comme traitement de contrôle. Tout au long de l'expérience, la quantité d'eau d'irrigation à appliquer a été déterminée en fonction de la modification du poids de chaque pot. Après chaque irrigation le volume de drainage a été mesuré dans des récipients placés sous chaque pot. Nous avons calculé la consommation d'eau de la plante à partir du bilan hydrique. Le seuil de la salinité du sol et la pente de la courbe de réponse du rendement au niveau de salinité ont été déterminés comme étant <1,5 dS m À1 et 4,4 respectivement pour le rendement en fruit et 6,7 dS m À1 et 3,7 pour le poids de matière sèche. Le résultat sur le rendement en fruits montre que l'aubergine est modérément sensible à la salinité. La consommation d'eau des plantes et l'efficacité de l'utilisation de l'eau ont IRRIGATION AND DRAINAGE

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The effects of salinity and irrigation regimes on yield, growth, and water consumption of cowpea (Vigna unguiculata) were determined in two different experiments. The first experiment focused on cowpea responses to irrigation water with six different levels of salinity (0.7, 2.0, 3.0, 4.0, 5.0, and 7.0 dS m-1). In the second experiment four different amounts of water (1.43, 1.0, 0.75, and 0.50 times of depleted water) were applied to cowpea plants. Seed and pod yields of cowpea decreased significantly for the soil salinity values higher than 9.0 dS m-1. As soil salinity increased, water consumption of cowpea decreased. Therefore, the effect of salinity in lowering evapotranspiration should be considered in irrigation planning and H08084; Online publication date

There is a growing realization that an increasing number of countries are approaching full utilization of their conventional water resources and that the quantity of good-quality water supplies available to agriculture is diminishing. Effects of irrigation regime and irrigation water salinity on bell pepper including yield, fruit number and quality, vegetative and root growth, evapotranspiration and water use efficiency were investigated in this study by conducting two different experiments. Six different salinity levels of irrigation water and four different irrigation regimes were used as treatments. Considering the results from irrigation water salinity experiment, it can be concluded that as soil salinity increases, water consumption, water use efficiency, yield and other vegetative growth parameters of bell pepper were decreased. A polynomial relationship between soil salinity and water consumption was observed. It was found that bell pepper is moderately sensitive to salinity with a 1.2 dS m (1 threshold and a 10.9% slope value. In the irrigation regime experiment, limited irrigation caused decreases in water consumption, yield and vegetative growth of bell pepper. Yield response factors were close in the cases of irrigation regime (1.50) and irrigation water salinity (1.40). Total soluble solids of bell pepper were increased due to both irrigation water salinity and water application rate but not dry matter ratio. Considerable water consumption decreases because of salinity were determined. Therefore, the effect of irrigation water salinity should be considered in irrigation management to prevent excess saline water application and to protect the environment.

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