Fig. 5

Scatter diagram based on the standardized values of all 14 parameters. Parameters including nodule number, effective nodule weight, nodule diameter, nodule grade, nodule nitrogenase activity, compound leaf number, shoot height, root length, shoot and root fresh weight, shoot and root dry weight, chlorophyll content, and crude protein content of five alfalfa varieties plants were determined after 45 days of growth. All of the determined values were applied to conduct a principal component analysis (PCA)