Figure 2
From: Climatic factors determine the yield and quality of Honghe flue-cured tobacco
Redundancy analysis (RDA) of quantity and quality of different flue-cured tobacco cultivars and environmental factors. (a) K326 cultivar; (b): Hongda cultivar; (c): Yun87 cultivar. Empty circle, Jianshui site; square, Luxi site; solid circle, Mile site; solid square, Shiping site. RDA (Redundancy Analysis), a kind of PCA analysis constrained by environmental factors, could reflect samples and environmental factors in the same two-dimensional ranking diagram, from which the relationship between sample distribution and environmental factors could be intuitively showed. The environmental variables: clay soil physical clay, pH soil pH, SOM soil organic matter, AN the content of soil alkali-hydrolyzed nitrogen, AP available phosphorus content, AK available potassium content, SCL soil chlorine content, FR field rainfall, FT field temperature, FS field sunshine, FH field relative humidity.
