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Soil Water Depletion and Recharge under Ten Crop Species and Applications to the Principles of Dynamic Cropping Systems

USDA-ARS, P.O. Box 459, Mandan, ND 58554

View larger version (25K): [in this window] [in a new window]   Fig. 1. Soil water depletion from mid-May to mid-September period measured to a soil depth of 1.8 m with a neutron moisture meter. Letters refer to Tukey's Studentized range test at P < 0.05.

View larger version (37K): [in this window] [in a new window]   Fig. 2. Depth distributions of soil water depletion for selected crop species measured with a neutron moisture meter for the period between mid-June and beginning of September in years 2002 (Site 1) and 2003 (Site 2). For a given year and soil depth interval, H indicates the highest value, O indicates values not significantly different from the highest value, * indicates values significantly lesser than the highest value, and lack of symbols indicates nonsignificance of main effect (crop) by Duncan's multiple range test at P < 0.10.

View larger version (30K): [in this window] [in a new window]   Fig. 3. Depths of snow entrapped in residue structures measured on two dates in 2004. Letters refer to Tukey's Studentized range test at P < 0.05 applied to dates separately.