Figure 5
From: Enhancement of soybean nodulation by seed treatment with non–thermal plasmas

Nitrogenase activity and leghaemoglobin content in nodules of 40-d-old plants grown from plasma treated seeds (PMN3 and PMO2), as well the control. Error bars indicate standard error (n = 5). Different lowercase letters denote statistical differences between groups (Tukey´s HSD test, P < 0.05).