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A greenhouse study was conducted to evaluate the response of cherry tomato cultivar Dulcito RZ to different irrigation levels and fruit pruning treatments. Treatments were three irrigation levels [50, 75, and 100%, based on the crop Evapotranspiration (ETc)], and three fruit pruning treatments (6, 8, and 10 fruits truss^-1). Results showed that the highest irrigation level (100% ETc) increased fruit weight and size, and total and marketable yield. However, water stress treatment (50% ETc) increased fruit quality traits (total soluble solids, titratable acidity, vitamin C, and total sugars). Plants pruned to 6 fruits truss^-1 yielded a heavier and larger fruit size, while unpruned plants had smaller fruit size with a significant increase in total and marketable yield due to increased number of fruits plant^-1. The increased incidence of fruit cracking with lower fruit load (6 fruits truss^-1) or with higher irrigation level (100% ETc) were related with the larger fruit size. The 50% ETc and full fruits truss^-1 (zero fruit pruning) treatments caused the highest values of irrigation water use efficiency (25.6-25.8 and 29.9-30.4 kg m^-3, respectively). To maximize marketable yield of cherry tomato and conserving irrigation water, it is recommended to apply 10 fruits truss^-1 pruning treatment along with the medium irrigation water level (75% ETc) under greenhouse conditions.

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Water deficit is a major factor limiting plant productivity of fruit quantity and quality, particularly in arid and semi-arid regions of the world. The total yield, fruit physical characteristics and nutritional value of four drought tolerant tomato genotypes (KSU-TOM-102, KSU-TOM-106, KSU-TOM-107 and TL–01860) were evaluated in response to deficit irrigation (DI) under field conditions. Three levels of crop evapo-transpiration (ETc; 50%, 75% and 100%) were applied at three different growth stages (vegetative, flowering and fruiting stage) to the four tomato genotypes. Tomato genotypes differed in their responses to water deficit. Among different genotypes, KSU-TOM-102 recorded the highest average total yield (89.54 t.ha^-1) under irrigation treatment with 100% of ETc during all stages as well as 75% of ETc during the fruiting stage. But, in general, total yield decreased under water deficit. Significant (P≤0.05) differences in fruits quality characteristics exerted by irrigation water treatments, tomato genotypes and their interactions. Irrigation with water at 50% ETc at all growth stages significantly (P≤0.05)  increased vitamin C, titratable acidity, total soluble solids and total sugar contents for tomato ‘KSU-TOM-107’ followed by ‘KSU-TOM-102’. But, this increase in nutritional value was accompanied with decrease in total yields by nearly 40-50%.   KSU-TOM-102 irrigated with water at 75% ETc at fruiting stage or vegetative stage recorded 0% and 12% reduction of the total yield, respectively, while maintaining good nutritional value as compared with 100% of ETc during all stages. Therefore, these treatments can be recommended as irrigation management strategy for tomato ‘KSU-TOM-102’ production under field conditions.