252 Bacteria in Relation to Country Life 



field, which was covered with ice for several weeks, the 

 vetch survived." In the milder climate of south Jersey, 

 the sand vetch frequently remains green all winter and 

 shows evidences of growth in the early spring. 



Fig. 45. Hoots of sand or winter vetch, showing an unusually large tubercle. 



Owing to this ability to withstand cold weather, and 

 to make rapid growth in the fall and spring months, the 

 sand vetch is a valuable addition to the list of cover- 

 crops. A mixture of cowpeas and vetch should prove 

 suitable for orchards or in crop-rotations on sandy soils, 

 since it permits a greater accumulation of nitrogen and 



