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Optimizing Crop Water Use in Sparse Stands of Pearl Millet

Texas Agricultural Experiment Station, 6500 Amarillo Blvd. West, Amarillo, TX 79106 USA

View larger version (23K): [in a new window]   Fig. 1 Leaf area indices (LAI) of pearl millet grown with nominal fertilizer inputs at a population of 30000 plants ha-1. The experiment was located within a windbreak shelter of Neem (Azadirachta indica A. Juss) trees. Even with these added inputs, LAI never reached 2. Redrawn from Wallace et al. (1993)

View larger version (20K): [in a new window]   Fig. 2 Relation between pearl millet grain yield and total (soil + crop) water evaporation (ET) in 1983, 1984, 1985, and 1990 at Sadoré, Niger. Total ET was very conservative within any given year, whereas yield varied according to level of management and amount of rainfall. From Payne (1997)

View larger version (21K): [in a new window]   Fig. 3 Relation between dry matter production and crop transpiration for pearl millet as affected by plant spacing. Redrawn from Azam-Ali et al. (1984)

View larger version (22K): [in a new window]   Fig. 4 Leaf area indices (LAIs) for pearl millet, cowpea, and intercropped pearl millet/cowpea. Data illustrate how cowpea increased effective LAI compared to the pearl millet monocrop. Mean ET was slightly greater for the pearl millet/cowpea intercrop compared to monocropped millet, but differences in ET were not significant. Redrawn from Nouri and Reddy (1990)