34 



FIELD CROPS 



treatment 

 2590 Ibs. hay per acre 



640 Ibs. nitrate soda 

 320 Ibs. acid phosphate 

 80 Ibs. muriate potash 

 7590 Ibs. hay per acre 



Fig. 8. Plenty of nitrogen is essential to good h 



320 Ibs. nitrate soda 

 320 Ibs. acid phosphate 

 80 Ibs. muriate potash 

 7110 Ibs. hay per acre 



ay crops. 



20 tons manure 10 tons manure No treatment 



7420 Ibs. hay per acre 4350 Ibs. hay per acre 2230 Ibs. hay per acre 

 Fig. 9. Grass crops make better use of barnyard manure 

 than does any other crop. 



