16i 



cowpea vines after the latter had been picked. Only 

 the ears of corn were removed from the land, and only 

 the roots of sweet potatoes. 



Rye, sown broadcast on November 13, 1899, on all 

 plots, was employed as the crop for determining what 

 effect the various summer crops had exerted on the 

 fertility of the soil. The fertilizer for rye consisted of 

 the following amounts per acre: 

 80 pounds of cotton seed meal. 



160 pounds of ammoniated acid phosphate. 

 61 pounds of muriate of potash. 



The effects of the legumes as fertilizers for rye would 

 liave been more striking if no cotton seed meal or am- 

 moniated guano had been employed, but the poverty of 

 this sandy soil made some nitrogen indispensible if ab- 

 solute failure of crop was to be avoided on the plots 

 where sweet potatoes, chufas and corn had grown. 



The rye was cut April 13 and April 16, and the green 

 forage at once weighed. Xo second cutting of rye was 

 made, but the land was turned to other uses. 



Yields of rye following sweet potatoes^ corn, chufas, 

 peanuts, cowpeas and velvet heans. 



Preceding crop. 



Increase from 



legumes as 



compared 



with sweet 



potatoes. 



Rye, after sweet potatoes dug (av. 2 plots) . . 



Rye, after corn, ears pulled 



Rye, after chufas, eaten on the land 



Rye, after Spanish peanuts; dug and only 



nuts removed 



Rye, after Spanish peanuts; eaten on the land 

 Rye, after Whippoorwill cowpeas, drilled and 



picked (diseased) 



Rye, after velvet beans, entire growth plowed 



in (av. 2 plots) 



Rye, after velvet beans, nearly mature pods 



picked, vines plowed in 



Rye, after running peanuts, entire growth 



plowed in (av. 2 plots) 



% 



41 

 93 



41 



181 



110 

 142 

 100 

 121 



