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Extraction of Subsoil Nitrogen by Alfalfa, Alfalfa–Wheat, and Perennial Grass Systems

Dep. of Plant Sci., Univ. of Manitoba, Winnipeg, MB, Canada R3T 2N2

View larger version (35K): [in a new window]   Fig. 1. Yearly distribution (1990–1995, excluding 1994) of NO3–N with the soil profile depth taken in October of each year for the cropping rotations: (a) continuous fallow, (b) annual rotation, and (c) continuous alfalfa. B, spring barley; P, field pea; and W, spring wheat

View larger version (29K): [in a new window]   Fig. 2. Distribution of NO3–N with the soil profile for Years 1 (1990), 2 (1991), 3 (1992), 4 (1993), and 6 (1995) of an alfalfa crop

View larger version (38K): [in a new window]   Fig. 3. Soil moisture content at three soil depth increments for nine different cropping and land use systems from 1991 to 1995. A, alfalfa; B, spring barley; G, native grasses; P, field pea; W, spring wheat. + indicates N fertilizer added according to soil test while - indicates no fertilizer N added