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Seeding Practices, Cultivar Maturity, and Irrigation Effects on Simulated Grain Sorghum Yield

USDA-ARS, Conservation and Production Research Lab., P.O. Drawer 10, Bushland, TX 79012-0010

View larger version (32K): [in a new window]   Fig. 1. Mean simulated sorghum grain yield plotted by year for dryland and supplemental irrigation levels to replace 2.5 and 5.0 mm d–1 evapotranspiration. Increasing irrigation increased and stabilized simulated yield, which resulted in nonhomogeneous variability across irrigation treatments.

View larger version (26K): [in a new window]   Fig. 2. Sorghum grain yields simulated using SORKAM with known planting conditions and recorded precipitation plotted in comparison with the corresponding measured experimental grain yields observed from 1984 to 1998.

View larger version (56K): [in a new window]   Fig. 3. Simulated tillers per plant for early-, medium-, and late-maturing sorghum cultivars planted on 15 May, 5 June, and 25 June for dryland, rain only, and rain supplemented with irrigation to replace daily ET of 2.5 mm d–1 "deficit irrigation" and 5.0 mm d–1 "full irrigation." Bars represent standard error.

View larger version (53K): [in a new window]   Fig. 4. Simulated panicle seed number for early-, medium-, and late-maturing cultivars planted on 15 May, 5 June, and 25 June for dryland, rain only, and rain supplemented with irrigation to replace daily ET of 2.5 mm d–1 "deficit irrigation" and 5.0 mm d–1 "full irrigation." Bars represent standard error.

View larger version (61K): [in a new window]   Fig. 5. Simulated seed mass for early-, medium-, and late-maturing cultivars planted on 15 May, 5 June, and 25 June for dryland, rain only, and rain supplemented with irrigation to replace daily ET of 2.5 mm d–1 "deficit irrigation" and 5.0 mm d–1 "full irrigation." Bars represent standard error.

View larger version (50K): [in a new window]   Fig. 6. Simulated sorghum grain yields for early-, medium-, and late-maturing cultivars planted on 15 May, 5 June, and 25 June for dryland, rain only, and rain supplemented with irrigation to replace daily ET of 2.5 mm d–1 "deficit irrigation" and 5.0 mm d–1 "full irrigation." Bars represent standard error.

View larger version (60K): [in a new window]   Fig. 7. Simulated sorghum harvest index for early-, medium-, and late- maturing cultivars planted on 15 May, 5 June, and 25 June for dryland, rain only, and rain supplemented with irrigation to replace daily ET of 2.5 mm d–1 "deficit irrigation" and 5.0 mm d–1 "full irrigation." Bars represent standard error.

View larger version (58K): [in a new window]   Fig. 8. Water use efficiency (WUE) calculated as the ratio of simulated 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 supplemented with irrigation to replace daily ET of 2.5 mm d–1 "deficit irrigation" and 5.0 mm d–1 "full irrigation." Bars represent standard error.