Fig. 7

Prototypes with experimental (right) and control (left) plants. 1. Five prototypes with younger (PCS) plants (1 month after sowing). 2. Five prototypes with older (PCH) plants (> 80 days after sowing). 3. Control plants. Note that all pots are surface covered with black polyethylene. In the middle (between 1 and 2) there is an irrigation basin to feed peristaltic pumps for automatic irrigation