114 



SUCCESSFUL FARMING 



ing crops. The only possible benefit in this respect is the more available 

 form that may result as the green manuring crops decompose. The only 

 real additions to the soil will be in the form of organic matter and nitrogen. 

 It is, therefore, essential to select those crops that will give the largest 

 increase in those two constituents. 



Fertilizing Materials in 2000 Pounds of Dry Substance. 



Plant and Part. 



Nitrogen, 

 per cent. 



Phosphoric Acid, 

 per cent. 



Potash, 

 per cent. 



Alfalfa, tops I 46 . 



Alfalfa, roots 41 . 



Cowpeas, tops 39 . 2 



Cowpeas, roots 23 . 6 



Crimson clover, tops 42 . 6 



Crimson clover, roots 30 . 



Common vetch, tops 59 . 9 



Common vetch, roots 43 . 8 



Red clover, tops 47 . 



Red clover, roots 54 . 8 



Soy bean, tops 43 . 6 



Soy bean, roots 21 . 



Velvet bean 50.2 



10.8 



8.6 



10.2 

 11. 



12.4 

 9.4 



14.2 

 15.8 



11.6 

 16.8 



12.5 



6.8 



10.6 



30.4 

 9.6 



38.6 

 23.2 



27. 

 20.4 



53.7 

 23.6 



42.8 

 16.4 



33.6 

 13.4 



76.8 



The cultivated crops, such as corn, potatoes, tobacco, cotton and 

 some of the heavier truck crops, generally follow a green manuring crop 

 to better advantage than crops that are broadcasted or drilled and do 

 not require cultivation. It is good practice to plow under green manur- 

 ing crops two weeks or more in advance of the time of seeding the crop 

 which is to follow. Lime applied to the surface before the crop is turned 

 under will tend to hasten decomposition and neutralize acids which are 

 generally formed. The more succulent the crop when turned under, the 

 greater the tendency to acid formation. 



REFERENCES 

 "Fertilizers and Manures." Hall. 

 "Farm Manures." Thorne. 

 "Barnyard Manure, Value and Use." Edward Minus, Dept. of Agriculture, Cornell 



University, Ithaca, N. Y. 

 Michigan Expt. Station Circular 25. "Composition and Value of Farm Manure." 

 Michigan Expt. Station Circular 26. "Losses and Preservation of Barnyard Manure." 

 Ohio Expt. Station Bulletin 246. "Barnyard Manure." 

 Purdue Expt. Station Bulletin 49. "Farm Manures." 



