ROOT DEVELOPMENT IN THE GRASSLAND FORMATION. 



Root Development in Mixed Prairie. 



PAGE 



Limon, Colorado 116 



Yuma, Colorado 116 



Ardmore, South Dakota 117 



Colorado Springs, Colorado . 



Phillipsburg, Kansas 



Mankato, Kansas 



Summary. 

 VII. Root Development of Crop-Plant Ecads. 



Medicago sativa 127 



Melilotus alba 131 



Bromus inermis 132 



Dactylis glomerata 133 



Festuca elatior 133 



Avena sativa 134 



Andropogon sorghum 134 



Helianthus annuus 



Trifolium repens 



Trifolium pratense 



Summary of Crop Plants 



Correlation of Crop-Root Development 

 with that of Natural Vegetation 



Summary 



VIII. Summary. 



143 | Bibliography 



page 

 119 

 119 



120 



135 

 136 

 137 

 139 



139 



149 



