346 



Missouri Agricultural Report. 



counties of Audrain, Monroe, Ralls, . Pike, Montgomery, Boone, 

 Randolph, Shelby and Marion, but occurring in greater or lesser 

 areas in most of the counties of the northeastern quarter of the 

 State. This soil while originally quite fertile, where the water 

 could be successfully removed, has been depleted by constant crop- 

 ping to corn, until today it stands in need of careful soil treatment 



Manure and rock phosphate as compared with no treatment on corn. Monroe City Ex- 

 perimental Field, 1907. No treatment produced 87.4 bu. per acre; manure and rock 

 phosphate, 50.1 bu. per acre. 



if it is to yield the proper returns. The analysis of this soil, as we 

 have already indicated, shows it to lack from one-third to one-half 

 its nitrogen and approximately two-thirds its phosphorus, while 

 the potassium supply is ordinarily ample if it can be made avail- 

 able to crops. 



EXPERIMENTS ON N. E. MISSOURI FLAT PRAIRIE (UNIONVILLE) . 



EXPERIMENTS OX CORN— 1905. 



