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Principal component analysis showing the relationships between root membrane phosphatidic acid (PA) molecular species and forage soybean nutritional quality following cultivation in acidic podzolic soils in cool climate production systems. (a) Observation plot showing segregation of three soil pH based on the centroids on the F1 and F2 axis; and (b) Biplot showing relationship between different observations, forage production, quality and membrane lipid PA at three soil pH.
