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Three Approaches to Define Desired Soil Organic Matter Contents

^a Landcare Research, Private Bag 11052, Palmerston North, New Zealand
^b Landcare Research, P.O. Box 69, Lincoln, New Zealand

View larger version (16K): [in a new window]   Fig. 1. Example of soil C contents (Mg ha-1 to a 20-cm depth) during successive 25-yr periods under continuous pasture, continuous cropping, and back to continuous pasture in a Melanic soil in New Zealand as predicted by the CENTURY model.

View larger version (23K): [in a new window]   Fig. 2. Soil quality rating (arbitrary scale; 0 = minimum, 100 = maximum) determined by an expert panel of soil scientists in relation to soil organic C content for New Zealand Recent soils (USDA Soil Taxonomy nearest equivalent: Endoaquept), as assessed against criteria for production (closed circles) or environmental risk (open circles). Bars show standard deviation.