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Soil Type, Climatic Regime, and the Response of Water Use Efficiency to Crop Management

Dep. of Soil Science, The Univ. of Reading, P.O. Box 233, Whiteknights, Reading, RG6 6DW, UK

View larger version (13K): [in a new window]   Fig. 1 Comparison of estimates of the fraction of net radiation available at the soil surface during the day using the Beers-Lambert Law (no symbols) and the model of Pearson et al. (1999)—with symbols. The leaf area index was either 0.5 (solid lines) or 5.0 (dashed lines)

View larger version (15K): [in a new window]   Fig. 2 The effect of soil type, rainfall distribution and root distribution on the index I. Simulations used either shallow roots and rainfall at 2 mm d-1 (•) and 6 mm d-1 (), or deep roots and rainfall at 2 mm d-1 () and 6 mm d-1 ()

View larger version (12K): [in a new window]   Fig. 3 The effect of rainfall on the index, I, for a clay loam (•), sandy loam (), and sand ()