10 



NEW HAMPSHIRE EXPERIMENT STATION 



[Bulletin 271 



Table IV — Per cent protein of alfalfa, 1928, air-dry 



basis 



the hay. The slight differences found are probably without significance. 

 The second cutting is decidedly richer in protein than the first. 



Soil samples were taken from each plot before the field was plowed 

 and before any treatments were applied, and then annually in October 

 during the course of the experiment, except in 1926. The quinhydrone 

 electrode was used in determining the pH of each sample. 



In Table V are presented the pH values corresponding to the aver- 

 age cH of all the plots receiving similar treatments for each year. The 

 averages of all plots receiving two tons of ground limestone per acre 

 and of those receiving four tons are shown graphically in figure 2. 



