ALFALFA. 



157 



Com'parison of Varieties of Alfalfa and Source of Potash. 



The area of the plots used in these experiments is one- 

 eighth acre each. The averages of both plots for the two years 

 are: for the common alfalfa, 3.261 tons per acre; for Grimm 

 alfalfa, 3.982 tons per acre, — a difference of about 22 per 

 cent., greater yield in favor of the Grimm. In 1912 the yield 

 of the Grimm alfalfa was 23 per cent, greater than that of the 

 common. In 1913 both varieties yielded larger crops than in 

 1912, the yield of the Grimm being 21 per cent, greater than 

 that of the common. The superiority of the Grimm as com- 

 pared with the common is shown to have been no greater in 

 the second year than the first. There is, therefore, no indica- 

 tion to date that the Grimm will prove more permanent than 

 the other. 



2. Comparison of Potash Salts for Alfalfa. 



' In one of the fields (Field B) of the experiment station 

 grounds, the soil of which is a medium loam with compact 

 and moderately clayey subsoil, alternate plots of t^ne-eighth 

 acre each have been continuously fertilized respectively with 

 muriate and high-grade sulphate of potash in equal amounts 

 for the past twenty-one years. These salts have been applied 

 since 1900 at the rate of 250 pounds per acre each. Through- 

 out the entire period (twenty-one years) these plots have each 



