October, '16] NITRATES IN ORCHARD SOILS. 31 



SUMMARY. 



1. Nitrification proceeded slowly on the sod plots of these 

 orchards. 



2. Stirring the soil readily increased the rate of nitrification. 



3. Under a good system of tillage nitrates were usually present 

 in excess of the needs of the trees. 



4. Lime consistently increased nitrification. 



5. Moisture was not the limiting factor in the sod plots. 



UBRAkf 

 M. C. State College 



