BPN7 figure 4b
![](https://images.echocommunity.org/dfc0a852-903a-459f-8671-00dd499bde5d/bpn7-figure-4b.jpg?w=400)
Figure 4. Jack bean (left) and cowpea (right) nodules on roots of plants in ECHO research plots in southwest Florida. Note the pink/red coloration in the cowpea nodules, indicating active biological nitrogen fixation. Source: Tim Motis