Received for publication May 8, 1976. Department of Agronomy Paper No. 1146.
Agricultural Meteorologist, National Research Center for Semi-Arid Tropics, EMBRAPA, P.O. Box 23, 56.3000-Petrolina-PE, Brazil (formerly Graduate Assistant, Cornell University); Graduate Assistant, Cornell University; Soil Scientist, USDA and Assistant Professor of Micrometeorology, Cornell University; and Supervisory Soil Scientist, USDA. and Professor of Soil Science, Cornell University. The authors express thanks to J. Bunce, Graduate Assistant, Department of Ecology and Systematic Sciences, Cornell University, who assisted with the thermocouple psychrometer measurements; W. Wickham for providing the vineyard site and much assistance; and J. Zwart for collecting data.