|Bockhold, Daniel - UNIV OF MO|
|Henggeler, Joseph - UNIV OF MO|
|Thompson, Allen - UNIV OF MO|
Submitted to: Irrigation Association Conference Proceedings
Publication Type: Proceedings
Publication Acceptance Date: November 6, 2001
Publication Date: November 6, 2001
Citation: Bockhold, D.L., Henggeler, J.C., Sudduth, K.A., Thompson, A.L. 2001. Comparison of eight irrigation scheduling tools on soybean and cotton. In: Proceedings 22nd Annual International Irrigation Show & Conference, Arlington, Virginia. p. 117-123. Technical Abstract: Optimization of irrigation scheduling is important for the most efficient water use and for maximizing yields. In this study, eight different irrigation scheduling methods were compared for cotton and soybean. Field plots were established at the University of Missouri Delta Center in Southeast Missouri for the following scheduling methods: (1) gypsum block, (2) tensiometer, (3) infrared crop canopy temperature sensor, (4) Arkansas Scheduler computer program, (5) the Woodruff chart method using historical weather data, (6) graphical interpretation of the slope of a soil moisture depletion curve, (7)use of a washtub to simulate crop water use, and (8) visual observation of crop water stress symptoms. In 2001 the number of irrigations triggered by the methods ranged from 2 to 6 on cotton and from 2 to 8 on soybean, with the most irrigations called for by the Arkansas Scheduler program. All methods were relatively inexpensive to implement, ranging from no cost (other than labor) to about $4 per acre assuming 400 acres under irrigation. The amount of effort required to implement and maintain each method was evaluated. The Arkansas Scheduler program and Woodruff charts required the least effort both for implementation and for use during the season.