rol! lU'lTTEl! CHOI'S 



w 



Of course this increased crop of clover means a larger yield 

 of corn to follow, and both clover and corn mean more farm 

 manure for further soil improvement or maintenance. 



As an average of the three years, 1907 to 1<)0!), plots six and 

 seven produced s,eventeen and one-half bushels more corn, seven 

 bushels more oats, 1720 pounds more clover hay,, and forty-three 

 pounds more clover seed, per acre, than plots four and five; 

 these Increases being due to the application of phosphorus. In 

 the later years the use of limestone is also producing- profitable 

 increases on the older prairie lands of the corn belt. 



Soils Deficient in Both Phosphorus and Lime — Soils on 

 which clover can not be grown successfully even before they are 



The w^ay to secure uniform fertilization of the soil 



badly worn are usually acid and consequently deficient in lime- 

 stone, but as a matter of fact such soils are usually deficient in 

 both limestone and phosphorus. 



The effect of limestone and of limestone and phosphorus in 

 connection with legume treatment on the University of Illinois 

 soil experiment field near Odin, Illinois, will serve to demon- 

 strate the need of both limestone and phosphorus on such soils 

 as are commonly called "clay land," which refuses to grow 

 clover. 



Wheat Yields in Soil Experiments 



Typical Wheat Belt Prairie Soil in "Egypt," near Odin, 

 Illinois 



Soil Treatment Applied 



None -. 



Legume ___ 



Legume, limestone 



Legume, limestone, phosphorus 



Legume, limestone, phosphorus, potassium 



Gain for legume, limestone, phosphorus treatment 



15 Bu. 



