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Sorghum Management Practices Suited to Varying Irrigation Strategies

A Simulation Analysis

^a USDA-ARS, Conservation and Production Res. Lab., P.O. Drawer 10, Bushland, TX 79012-0010
^b Texas Agric. Exp. Stn., Blackland Res. Ctr., 720 E. Blackland Rd., Temple, TX 76502

View larger version (52K): [in this window] [in a new window]   Fig. 1. Simulated (1958–1999) grain sorghum yields averaged across plant population (P) for early, medium-, and late-maturing cultivars planted on 15 May, 5 June, and 25 June for dryland, rain only, and rain + irrigation (I) for 2.5, 3.75, and 5.0 mm d–1. Bars represent standard error.

View larger version (42K): [in this window] [in a new window]   Fig. 2. Average (1958–1999) cumulative irrigation applied for rain + irrigation treatments of 2.5, 3.75, 5.0 mm d–1 to the early, medium-, and late-maturing grain sorghum cultivars planted on 15 May, 5 June, and 25 June. Bars represent standard error.

View larger version (52K): [in this window] [in a new window]   Fig. 3. Simulated (1958–1999) water use averaged across plant population for early, medium-, and late-maturing cultivars planted on 15 May, 5 June, and 25 June for dryland, rain only, and rain + irrigation for 2.5, 3.75, 5.0 mm d–1. Bars represent standard error.

View larger version (53K): [in this window] [in a new window]   Fig. 4. Water use efficiency (WUE) averaged across plant population from the ratio of simulated (1958–1999) sorghum grain yield and water use for early, medium-, and late-maturing cultivars planted on 15 May, 5 June, and 25 June for dryland, rain only, and rain + irrigation (I) for 2.5, 3.75, and 5.0 mm d–1. Bars represent standard error.

View larger version (37K): [in this window] [in a new window]   Fig. 5. Simulated (1958–1999) grain sorghum yield increase relative to the adjacent lower irrigation treatment level. Values for early, medium-, and late-maturing cultivars planted on 15 May, 5 June, and 25 June that received rain and rain + irrigation for 2.5, 3.75, and 5.0 mm d–1 are averaged across plant population (P). Bars represent standard error.

View larger version (39K): [in this window] [in a new window]   Fig. 6. Irrigated water use efficiency (I-WUE) calculated as the ratio of the simulated (1958–1999) grain yield increase and the corresponding irrigation increment relative to the adjacent lower irrigation treatment level. Values for early, medium-, and late-maturing cultivars planted on 15 May, 5 June, and 25 June that received rain + irrigation for 2.5, 3.75, and 5.0 mm d–1 are averaged across plant population (P). Bars represent standard error.