Water Stress Effects on Pima Cotton Lint Yields Using Infrared Thermometry to Schedule Irrigations

Abstract

The Crop Water Stress Index (CWSI) was used to schedule irrigations on Pima S-6 cotton on a commercial scale in Waddell, Ariz. in 1991. The field study consisted of sixteen, one acre, surface irrigated plots. There were four water treatments with four replicates arranged in a randomized complete block design. There were no significant lint yield differences among water treatments. However, an additional two irrigations totalling an acre foot of water were needed to maintain the treatment thresholds.