Abstract:
Studies on effective use of water resources for sustainable agricultural production are
necessary to achieve the required food production to meet the growing demand in the
world. This study was conducted, under the field conditions to determine the effects of
regulated deficit irrigation (RDI) on yield, and to suggest irrigation management guidelines
for tomato farming in the semi-arid area. Irrigation was applied in three-day intervals, at
ratios of 133% (T1), 100% (T2) and 66% (T3), as determined from the amount of total
irrigation (IW)/total evaporation (CPE) for different three growth stages. Although the
greatest water saving was 43%, the yield loss was increased up to 62%. The total fruit yield ranged from 33.34 t ha-1 to 83.59 t ha-1. The water savings were 21% and 43% for the T2 and T3 treatments, respectively, compared with the T1 treatment. In tomato, the water saved with deficit irrigation does not compensate for the yield reduction that resulted under these experimental conditions.