A field experiment was conducted to study the effect of water regime (W), row spacing (RS) and plant density (D) on growth
and productivity of tomato cv. ’Pito Pride’ at the Agriculture Experimental Station of King Abdulaziz University. Two water
regimes, W1 (70% of water requirement) and W2 (full water requirement) were studied. Under each water regime three row
spacings (RS1, RS2, RS3) and two plant densities D1 (single plant per dripper) and D2 (two plants per dripper) were investigated.
Results revealed that W1 reduced number of days to flowering and fruit setting, plant height, plant fresh weight and total
yield, while it increased water productivity (WP). Decreasing RS increased water supply and total yield but decreased growth
characteristics. D2 increased total yield by 122–168% and WP by 131–180% compared to D1. Interaction between the three
variables investigated was significant for all assessed characteristics except fruit yield per plant, total fruit yield and WP. These
characteristics were affected by the interaction between RS and D. The highest total yield and WP were obtained from the
RS2-D2 treatment. This treatment increased total yield per ha by 11–331%andWP by 12–300% compared with the maximum
and minimum yield of other investigated treatments of both seasons. Copyright © 2014 John Wiley & Sons, Ltd.