Agriculture Reference
In-Depth Information
FIGURE 2:
Redundancy analysis of soil potential enzyme activities constrained by soil
physicochemical properties (0-15 cm) at the 13 organic tomato fields in Yolo County,
California, USA. A parsimonious set of explanatory factors was generated using a forward
selection procedure (see methods; Blanchet et al., 2008). (a) Vectors represent selected
soil physicochemical properties. Axes 1 and 2 represent 42 and 14% of the total variation,
respectively, with the whole model accounting for 65% of the variation. (b) 95% confidence
ellipses (see methods) for RDA field scores (6 per field), numbered by field and colored by
primary organic amendment. Dotted lines indicate fields where a vetch cover crop was grown
in addition to the organic amendment (either manure or composted green waste) used.
