34 EXPERIMENT STATION. [Jan. 



potash at the rate of 105 pounds per acre to each of the 

 plots. All plots are equally manured, and liberally, with 

 materials furnishing nitrogen and phosphoric acid. 



The crops which have been grown in this field in the order 

 of their succession beginning in 1898 have been as fol- 

 lows : — 



1898. Medium Green soy beaus. 



1899. Potatoes. 



1900. Plots 1-8, cabbage; 9-24, Medium Greeu soy beans; 25-40, 



cowpeas. 



1901. 1-8, wheat; 9-40, corn. 



1902. Clover. 



1903. Clover. 



1904. 1-16, cabbage; 17-40, corn. 



1905. Soy beans. 



1906. Potatoes. 



The results last year with the soy bean seemed rather 

 inconclusive, on account of the number of variations due to 

 exceptional conditions not necessarily connected with the vary- 

 ing use of potash salts. In brief, it may be stated that the 

 plots to which kainit was applied gave the smallest average 

 crops in the field, the yield being less even than on the 

 no-potash plots. Carbonate of potash gave the highest aver- 

 age yield, followed closely by high-grade sulfate and silicate, 

 while the yields on nitrate, muriate and low-grade sulfate 

 were not much inferior. 



The crop of the past season was potatoes. The variety 

 grown was the Green MoTintain, the seed having been pur- 

 chased in Maine. One accidental variation must here be 

 recorded, viz., that the quantity of Green Mountain seed 

 proved to be slightly less than was needed, so that it was neces- 

 sary to use another variety, Carmen No. 3, also from Maine, 

 on one of the plots (40). The seed potatoes w^ere treated 

 with formalin at the rate of 1 pint to 15 gallons of w^ater 

 in the usual w^ay on May 7. The field w^as plowed on May 8. 

 On May 10, 2,427 pounds of freshly slaked lime were ap- 

 plied. This was harrowed in on May 11. On May 12, fer- 

 tilizers were applied and li arrowed in on the same day. On 

 the same date, also, one-half the plots, four series, 1-20, w^ere 



