210 



TABLE VIII. 

 The X. P. and Organic Matter, from 40 to 85'^ Organic Matter 



*Acid. tVery acid. *1 ,000,000 pounds per acre 6 2-3 in. = weight ot muck soil 

 8.8% of the Surface Soils in this organic iiroup. 



Summary. 



Analysi-s shows that a large per cent of the soils of Fulton County 

 are deficient in organic matter. About half of them are below 4 per 

 cent. 



The .soils are not very acid to litmus. Only six samples were found 

 to be unusually acid while fifty-two others were slightly acid to the 

 same indicator. Most of the acid samples were among the .soils con- 

 taining a low amount of organic matter. 



A considerable number of the soils contained less than 1,.500 pounds 

 of phosphorus and nitrogen per acre (6 2/3 in.). These amounts are 

 deficient and such soils would undoubtedly respond profitably if fer- 

 tilized with these elements. 



The tables show a considerable decrease in content of plant food in 

 cultivated soil compared with corre.sponding virgin soils. 



The accompanying graphs indicate that there is a close relation- 

 ship between the yield of corn and the nitrogen and phosphorus content 

 of the soil. As the nitrogen and phosphorus content increases, the 

 yield increases. 



