24 



FOR BETTER CROPS IN THE SOUTH 



Improving Worn Hill Land— In actual field experiments 

 on worn hill land on the University of Illinois soil experiment 

 field, the following results have been obtained in a three-year 

 rotation of wheat, corn, and cowpeas. By " legume " treatment 

 is meant the growing of legume crops or catch crops, as cowpeas 

 in the corn, or after the wheat, in the same season, which are 

 turned under for the nitrogen and organic matter which they 

 add to the soil. 



Crop Yields in Soil Experiments 

 Worn Hill Land near Vienna, Illinois 



Soil Treatment Applied 



1903 1904 1905 

 Yields Yields Yields 



Wheat, Bushels per Acre 



None 



Legume 



Legume, limestone , _..-• 



Legume, limestone, phosphorus 



Legume, limestone, phosphorus, potassium.. 



Corn, Bushels per Acre 



None 



Legume-..,.. — 



Legume, limestone 



Legume, limestone, phosphorus 



Legume, limestone, phosphorus, potassium . - 



1 

 11 



18 

 26 

 30 



38 

 43 

 62 

 57 

 57 



The year 1903 was a very poor season for both corn and wheat. 

 It will be seen that limestone and legumes (cowpeas or clover) 

 have very great power to improve this class of soils. 



As yet the addition of phosphorus and potassium has not 



Saving labor and getting the best out of the manure 



increased the corn yields, although with wheat, phosphorus has 

 given a marked increase and potassium some further gain, not- 

 withstanding the fact that these two best treated plot series 

 were naturally slightly less productive than the other three 



