The heavy clay soils of Quebec, while level and uniform
in appearance, are unique in their distinctive patterns of
variability. These patterns were produced by a system of
traditional tillage management used in the past to facilitate
surface drainage. Preliminary assessments indicated that
this variability may be manageable. The purpose of this
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new project is to assess the responsiveness of these soils to
variable rate application of nitrogen (N) and K, in order to
maximize beneficial interactions between the two nutrients.
Within nine producer-managed fields, detailed analysis
of the spatial structure of variation in soil fertility has
revealed complex correlations. Further analysis is required
to determine the manageability of this within-field
variation. The project has received matching funding from
the Canadian government (NSERC), and is continuing.