MU 



oiilv alxmt lialf of a normal yield, was plowed under 

 ^lai'ch 14, at which time the stubble plot was also 

 plowed. 



On the stubble plot and on one of the othei-s corn 

 was fei'tiliz(Ml with 100 pounds of acid phosphate per 

 acre, which fertilizer was omitted from the third plot. 

 The stand was uniform. The yields of corn in l)ushels 

 per acre were as follows : 



Bus. 



Pea stubble and phosphate as fertilizer 11.40 



Pea vines and phosphate as fertilizer 20.28 



Pea vines as fertilizer, no phosphate 21.74 



The yield of corn following pea vines was 78 per cent, 

 greater than the yield on the plot where the stubble 

 only had been plowed under, the increase being 8.88 

 bushels per acre. 



In the presence of a considerable amount of rich vege- 

 table matter furnished by pea vines, phosphate was not 

 needed on this soil wliere acid phosphate had been ap- 

 plied annually for many years. 



In a different field on more permeable gray sandy 

 soil corn grown in l^v")! on a plot where the stubble of 

 AVonderful cowpeas had been plowed under for hay 

 yielded 25.3 bushels per acre. The average yield of 

 corn on two adjacent plots — where cowpea vines of the 

 varieties Lady and AYliite Giant, both luxuriant growers, 

 had been plowed under, was 25.9 bushels per acre. 

 Here there was practically no superiority of vines over 

 stubble as a fertilizer for corn. 



Note should also be taken of the increase in the corn 

 crop due to plowing in either stubble or vines of a num- 

 ber of varieties as recorded in the table on page 131. 



