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3373. Janzen, H.H.. 1987. Soil organic matter characteristics after long-term cropping to various spring wheat rotations.. Can. J. Soil Sci., 67:845-856.
Various spring wheat rotations with and without perennial forages on total and mineralizable soil organic matter contents. The organic C and N contents of soil after 33 yr of cropping were highest in treatments continuous W and FWWAAA, and decreased with increasing frequency of fallow in the rotation. The inclusion of the perennial forage in the rotation did not increase organic C and N levels above those abserved in the continuous wheat treatment. It was concluded that inclusion of perennial forages in spring wheat rotations for the purpose of enhancing soil fertility and organic matter levles was not justified under semi-arid conditions.