CONTENTS. 



Page. 



Organization of collaborative work 7 



Experiments conducted a1 Washington, I). (' J> 



Experiments conducted by tin- Indiana station 11 



Kxperiments conducted l>y the Iowa station 14 



Experiments conduct (M! l>y the Kentucky station l' 



Kxperiments conducted by the Michigan station is 



Experiments Conducted by the Xew York station, Geneva '^<> 



l-'xperiineuts conducte<l hy the Cornell station, Ithaca, X. V.. 21 



Experiments condnctel by the Utah station 22 



Kxperiments conducted hy the Virginia station - I 



Experiments conducted hy the Wisconsin station 2l 



The S( ,il:: ". 



Descriptive notes on soils -"' 



Analyses of soils 'i2 



Comment on analyses "" 



Relation of crop to the physical properties of tin- soil !H 



Relation of crop to the chemical properties of the soil :fc r i 



Summary < >f data. 36 



( 'onclusions '' 



5 



