171 



each year in cotton, the cotton immediately folloTv^ing 

 cowpeas so^yn after small grain. One-half the total 

 area can be deyoted to cotton by a four-year rotation 

 on this plan, as follows : Corn A^itli coAypeas, small grain 

 followed by cowpeas, cotton, and cotton. 



The Ayi:RAGE Immediate Fertilizing Effects of Vines 

 AS Compared with Stubble of Cowpeas and 



VELyET Beans. 



Although in the last table a comparison of the per- 

 centage increase after yines with that after stubble is 

 not strictly leofitimate since the number of tests was 

 unequal, yet that table throw^s some light on the mat- 

 ter. 



A strictly accurate comparison of the fertilizing ef- 

 fects of yines and stubble as measured by the crop im- 

 mediately following is shown below; in this table only 

 those experiments are recorded where corresponding 

 yine and stubble plots were under identical conditions 

 of soil, date of planting, etc. 



Increased percentage of vine plots over stubble plots. 



♦Yield after legume stubble 31 and 20 per cent, respectively 

 greater than after vines, the latter leaving the land too loose, a con- 

 dition that could probably have been avoided by better preparation. 



In the crop immediately follo^^'ing the legumes the 

 yines afforded the larger yield except when accidental 

 circumstances reyersed this result with wheat and oats. 

 This excess in the first crop due to plowing under the 



