Agriculture Reference
In-Depth Information
FIGURE 4:
RDA of indicator FAMEs in soil from the 0-15 cm surface layer at the 13
organic tomato fields in Yolo County, California, USA, constrained by soil physicochemical
properties. 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 13.1 and 11.5% of the total
variation, respectively, with the whole model accounting for 29.3% 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.
