Figure 3.

Efflux of oxalate, citrate, and malate from whole roots of signalgrass (B. decumbens) and ruzigrass (B. ruziziensis) (means ± se of five to six groups of five plants each). Plants were cultivated as in Figure 2, and exudates were collected during 1 h in the same nutrient solutions in which the plants had been cultivated. Asterisks denote statistically significant interspecific differences (P < 0.05).