Root spread from close-planted (5.5 × 1 m) peach trees [ Prunus persica (L.) Batsch] was restricted when irrigated from trickle or microjet outlets. Roots spread less under trickle, and trees grew more slowly but cropped earlier. Fruit set heavily on both treatments in 5th leaf. The results suggest that irrigation technique can be used as a management tool affecting tree growth and productivity for close-planted orchards.
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Mitchell et al. (1983) studied this question.