17U 



on the plot where German millet stubble had been plowed un- 

 der and on the one where crab grass and various weeds had 

 just been buried by the plow. 



On all plots oats were fertilized with 220 pounds per acre 

 of acid phosphate and 44 pounds of muriate of potash, 

 no nitrogen being supplied except that contained in the 

 remains of preceding crops of cowpeas, velvet beans, etc. 



Yield per acre of oats grown after stubble or vines of cowpeas, 



velvet beans^ etc. 



Oats after velvet bean vines 



Oats after velvet bean stubble 



Average after velvet beau vines and stubble. 



Oats after cowpea vines 



Oats after cowpea stubble ... 



Average after cowpea vines and stubble 



Oats after crab grass and weeds 



Oats after German millet , 



Average, after noa-leguminous plants 



From early spring there was a marked difference in the 

 appearance of the several plots, the plants being much greener 

 and taller where either the stubble or vines of cowpeas had 

 been plowed under. 



When the oats began to tiller, or branch, the difference 

 increased, the plants supplied with nitrogen, through the de- 

 cay of the stubble or vines of cowpeas and velvet beans, tiller- 

 ing freely and growing much taller than the plants following 

 German millet or crab grass. 



May 18, 1898, oats on all plots were cut. 



In this experiment the average yield of oats was 33.6 

 bushels after velvet beans, 81.6 bushels after cowpeas, and only 

 8.4 bushels after non-leguminous plants (crab-grass, weeds and 

 German millet). 



Here is a gain of 24.2 bushels of oats and nearly three- 

 fourths of a ton of straw as a result of growing leguminous or 



