| NO3--N content of drainage water was measured continuously from three sites (Bio-Environmental Engineering Centre (BEEC), Onslow, and Streets Ridge) from 1997 to 2000 for the Onslow and Streets Ridge Site, and from 1999 and 2000 for the BEEC site. The BEEC Site was used to study the effect of inorganic fertilizer versus organic fertilizer (hog manure) on NO3--N leaching using eight subsurface drainage plots. The Onslow site was used to study the effect of different rates (low, medium, and high) of dairy manure on NO3- -N leaching using nine subsurface drainage plots. The final site (Streets Ridge site) studied the effect of timing of beef manure (spring versus fall) on NO3--N leaching using six surface and six subsurface drainage plots. The sites ranged from 2.9 to 5.4 ha in size and varied in cropping practices and drainage systems. Soil and plant tissue data were also taken during 1999 and 2000 at each of sites and analysed for NO 3--N concentrations. (Abstract shortened by UMI.)... |
