157 



Residual fertilizing effect on late corn of cowpea and 

 velvet bean vines and stuhhle. 



On June 20, 1898, or a month after the harvesting of 

 the oats in the last mentioned experiment, all six of 

 these plots were planted in corn without nitrogenous 

 fertilization, which crop, as usual with very late corn 

 on poor upland, was a failure. 



The vields were as follows: 



Yields of late corn grown as the second crop after 



legumes. 



The fertilizing effects of both stubble and vines of 

 cowpeas was scarcely perceptible in the late corn 

 planted eight months after and harvested thirteen 

 months after the plowing under of the large amounts of 

 nitrogen furnished by the legumes. Apparently the 

 crop failure was not due to deficient rainfall, for this 

 was ample except for about two weeks about the middle 

 of Auo^ust. The small size of stalks leads to the sus- 

 picion that there was a deficiency of nitrogen on all 

 plots. If this nitrogen was lost by being leached out 

 in the draining water this loss must have occurred al- 

 most entirely after corn was planted or in July and 

 August ; for in 1898 April, May, and June were unusu- 

 allv drv months. On the other hand there was a 

 period of excessive rainfall July 4 to 11 and of still 

 greater excess July 28 to August 6. During this latter 



