294 SCIENCE AND FRUIT GROWING 



MUSTARD. 

 No Grass in Tray. Grass in Tray. 



TOBACCO. 

 No Grass in Tray. Grass in Tray. 



FESTUCA. TOBACCO. 



Festuca in Tray. No Festuca in Tray. No Clover in Tray. Clover in Tray. 



FIG. 40. PLANTS GROWN WITH AND WITHOUT A SURFACE CROP. 



