CROPPING SYSTEMS, FERTILIZERS FOR CORN 225 



are not necessarily secured when the fertilizing constituents 

 are applied to the land in the same ratio to each other as 

 they occur in the plant has been demonstrated by several 

 experiment stations. The results from the Ohio Sta,tion 

 are given: 



Table 20. Feetilizbk Tests with Continuous Corn Culture 

 AT THE Ohio Agricultural Experiment Station. Average 

 FOR 16 Years, 1894-1909 ^ 



274. Relative importance of fertilizing constituents. — 



A review of the experimental evidence regarding the rel- 

 ative value of the different fertilizing constituents when ap- 

 plied to corn in the cotton-belt shows that in the majority 

 of cases nitrogenous fertilizers have increased the crop to 

 a much greater extent than other kinds. There are two 

 important reasons why this is true. (1) Corn makes more 

 excessive demands on the soil for nitrogen than for other 

 food elements. (2) Southern soils in general are low in 

 organic matter and therefore deficient in nitrogen. 

 The profits ^rom the use of phosphatic fertilizers are, as 

 1 From Montgomery's "Com Crops," p. 139. 



