ABSTRACT
The Crop Water Stress Index (CWSI) was used to schedule irrigation on D&PL 90 cotton in 1990 and Pima S-6 in 1991. The experiments were conducted on a large scale commercial basis in Waddell, Arizona. Both experiments consisted of sixteen one acre surface irrigated plots. There were four irrigation treatments with four replicates arranged in a randomized complete block design. In both experiments highest lint yields were obtained with the medium treatment with a targeted CWSI threshold of 0.30 CWSI units.
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