61 



thiF piat to correspond with thf^t on baro land and m eorn 



above not?!, it would se^m that tha yibid ie not corr«alated 

 with th» .aoiPt-;rs. xn the BOil ivi-isr? plats fc.re scrap-:d. 

 It 'A-.;>Uid fart-i-i-r s^-im to'indicats some C0(rir'c.:i!^^ating factor 

 or factors. 



It IB usually surposwd that cultivation favors nitri- 

 fication, ^^nyd^r, ('^'oiis ^nd F'^^rtilizers} , 114) states 

 that CL-itxvation, particular! ;v yf c^ay sdiIe favors nitri- 

 ficii^:jLon iiiQC'^asin-'^ the supply of oxygen in th«& aoil. 

 If this ba tra&, v,-iv^ ch© Illinois and '^.onth , Carolina soils 

 suri'f iciwntiy rich in nitrattsia under ths supposedly un- 

 favorable conditions far the nitr-^tes not to be a limiting 

 factor ? 



