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Tillage and Previous Crop Effects on Dynamics of Nitrogen in a Wheat–Soil System

^a Agric. and Agri-Food Canada, Res. Branch, P.O. Box 29, Beaverlodge, AB, T0H 0C0, Canada
^b Agric. and Agri-Food Canada, Res. Cent., 6000 C & E Trail, Lacombe, AB, T4L 1W1, Canada

View larger version (21K): [in a new window]   Fig. 1. Effect of tillage on NO3 in surface soil (0–15 cm) and top 100 cm of soil during the growing season. Nitrate in the 15- to 100-cm depth (subsurface soil) is the difference between the two graphs depicted. Data are averages over 3 yr (1994–1996) and previous crops (n = 27). * indicates significant difference at P 0.05; *a indicates significant difference at P 0.05 for 15- to 60-cm increment only.

View larger version (26K): [in a new window]   Fig. 2. Effect of previous crop on NO3 in surface soil (0–15 cm) and top 100 m of soil during the growing season. Nitrate in the 15- to 100-cm depth is the difference between the two graphs depicted. Data are averages over 3 yr (1994–1996) and tillage treatments (n = 18). * indicates significant difference at P 0.05.

View larger version (52K): [in a new window]   Fig. 3. Effect of (a) tillage and (b) previous crop on soil microbial biomass N (MBN) at 0- to 15-cm soil depth at five sampling times. Data are averages over 2 yr (1995 and 1996). *indicates significant difference at P 0.05. Pooled SE = 1.93.

View larger version (19K): [in a new window]   Fig. 4. Variation in soluble organic N (SON) and soil moisture in surface soil (0–15 cm soil depth) with time. Data are averages over 2 yr (1995 and 1996) and across tillage and previous crop treatments.