117 



This shows tliat in 1001 on gray sandy hind after crim- 

 son clover cut for liay, the yield of sorghum hay was prac- 

 tically twice as much as where the preceding crop was 

 ryo, used for hay. 



On another field, also in 1901, on poor gray sandy soil, 

 Ihe results were as follows: 



Yield of Horglmm hay per acre grown after crimson clover 



and crimson clover stuhhle in 1901. 



Preceding crop as fertilizer Yield sorghum hay Inci-ease per acre 



Lbs. Lbs, 7o 



Rye stubble 5525 



Crimson clover stubble 9750 4425 76 



Crimson clover, entire . •-.... 10300 4775 86 



This table shows that by plowing under crimson clover 

 in April the yield of sorghum hay grown immediately after 

 was nearly doubled. When the crimson clover was cut 

 for hay the sorghum yield was increased by 76 percent. 

 The yield of crimson clover hay on this stubble plot was 

 2741 ]>ounds ])er acre, and the increase in sorghum hay due 

 fo the use of cloxei- stubble as a fertilizer, was 4225 pounds 

 per acre. 



A third experiment on this line was made in 1903 on 

 reddish loam soil wliich was naturally richer than the 

 gray soil of the two experiments just mentioned. 

 This i-eddi.,h loam had also been helped by a light applica- 

 tion of stable manure applied to the crop of small grain 

 which preceded the crimson clover. 



Under these favorable conditions the yield of crimson 

 clover hay was 6100 pounds per acre. The adjacent plot 

 had been treated exactly like the crimson clover plot as 

 regards previous cropping and manuring. 



Yield of sorf/hutn liai/ per acre fjroivn after erimson clover 



in 1903. 



Preceding crop Yield sorghum hay Increase per acre. 



Lbs. Lbs. 



Winter and spring weeds ..•• 4400 



Crimson clover as fertilizer (stubble) 13000 8600 



Here we have an extreme or maximum fertilizing effect 



