Figure 2.

Plant-phosphorus (P) contents in cowpea varieties under different available soil-phosphate (Pi) levels with or without water deficit stress. (A) Low soil-Pi, (B) moderate soil-Pi, and (C) high soil-Pi. Mean values and standard errors (bars) are shown (n = 4). Different small letters indicate significant differences between the water-deficit and well-watered plants for each variety at each available soil-Pi level (Fisher's test; p < 0.05). Different capital letters indicate significant differences among the varieties at each available soil-Pi level (Fisher's test; p < 0.05).