Crimson Clover and Sand Vetch 



251 



IBfl 



in the nitrogen-gathering power of crimson clover on 

 different soils and in different seasons. Rainfall, tem- 

 perature, humus, and the supply of lime, phosphoric 

 acid and potash, aside from many other factors, play an 

 important role. In AA ^ 



general, the amount 

 of nitrogen in a crop 

 of crimson clover 

 may range from 50 

 pounds per acre, or 

 less, to 200 pounds 

 per acre or more. In 

 the experiments of 

 the Delaware sta- 

 tion, already cited, 

 the yield of nitro- 

 gen per acre was 

 from 139 to 188 

 pounds. 



The sand vetch 

 (Vicia villosa) is an- 

 other crop that has 

 been employed sue- Fig 44 A bunch of crimson clover plants The 



ppsfiil1v 9Q a crrppn- mass of fibrous roots indicates a wonder- 



5 IUliy as a gre fu , feeding capacity and explains its rapid 



manure On light and early growth. 



soils. It is a hardy plant that will thrive on poor 

 lands and will stand cold weather well. It has been 

 recommended as a cover-crop for the tobacco soils in 

 the Connecticut valley. It is stated by the Connecticut 

 station in this connection that it survived in spots where 

 rye was completely winter-killed. "In one portion of a 



