204 



and average square yard of Plot 2 was harvested, as weie 

 similar areas of inoculated vetch and of non-inoculated vetch 

 on adjacent plots. 



The roots, to a depth of 6 inches below the surface and 

 from an area of one square yard, were also separated from the 

 soil by sifting, and then by repeated washing. Practically 

 all the roots were found in the upper 6 inches. 



Acre-yields of hay, calculated from such small areas are 

 liable to considerable error, but in this case they agree rather 

 closely with the figures obtained by weighing the entiie pro 



j-SSaa...^, 



CRIMSON CLOVER. 



Roots and stubble from one square yard 

 of inoculated crimson clover 



Roots and stubble from one 

 square yard of non-inocu- 

 lated crimsom clover. 



duct of the one-twelfth-acre plots, indicating approximate 

 correctness.* 



The results follow, the weights being for air-dry material, 

 or the natural dry condition of hay, straw, grain, etc : 



*The variations between the acre-yields as calculated from the 

 large and small plots is due to the fact that the yields on larfje plots 

 included weeds, and in certain cases some accidentally inoculated 

 plants. In the small areas, used for sampling, no accidentally inocu- 

 lated plants were included and all weeds were separated. 



