48 



The Bulletin. 



Chart 1. 



COMPARA.TIVE 

 WATER KOr.Pmr. T^OWF.T?.-=)nF.-^nTT.f> 



lOO POUNDS of eooh Of the -Following 50IL5 when 

 ,'oATtj RATED HE'LD -the feUpwing omount-5 of WATER 



iWFLUKliCE OF 5Y5TEM5 OF FAKMIHG OH 



50IL5 



Hinngaoto Prmri e Tfirrrx 



«>YSTEM 



35 VRS). POTATIOH 

 & MANURE 



35VRS 6RAIH 



HUMU5 



per cent 



CROP VIELD 

 per acre. 



WHEAT 



esbu. 



ebt 



35YR5 ROTATION 



35 YR5 GRAIN 



HUMU>3 WATEIRHELO 



i&0% 



3S/5 



Chakt 2. 



