190G.] PUBLIC DOCUMENT — No. 33. 25 



nitrate, carbonate and silicate. Each is applied annually to the 

 same plot, and all are used in such amounts as to furnish equal 

 potash to each plot. In the quantities employed the different 

 salts supply annually actual potash at the rate of 165 pounds 

 per acre. All plots are equally manured with materials furnish- 

 ing fairly liberal amounts of nitrogen and phosphoric acid." 



The crops grown in this experiment since 1898 in order of 

 succession up to the present year have been : — 



1898. Medium Green soy beans. 



1899. Potatoes. 



1900. Plots 1-8, cal)bago; 9-24, Medium Green soy beans; 25-40, 



cow peas. 



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



1902. Clover. 



1903. Clover. 



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



1905. Soy beans. 



The results with the crops of last year, cabbages and corn, 

 were rather indecisive, and were not reported in detail. 

 The most striking observation in connection with the results 

 of last year was the relatively low yields on the silicate of 

 potash and the relatively high yields on the nitrate and car- 

 bonate. The crop in 1905 was the Medium Green soy bean. 

 The season was favorable to the crop, which, with one ex- 

 ception, to be presently noted, appeared to be affected by no 

 disturbing accidental conditions. A circular area, extending 

 entirely across Plot 10 and a short distance into both plots 

 9 and 11, was early aftected by some unknown cause, which 

 within a relatively short time resulted in the death of the 

 plants growing there. It is estimated that the total number 

 of plants in Plot 10 thus destroyed was from one-quarter to 

 one-third of the total number of plants in the plot. The 

 proportion of plants destroyed in plots 9 and 11 was rel- 

 atively small. 



At a period very early in the growth of the crop it was 

 noticed that the leaves on all the plots to which kainite is 

 applied as a fertilizer were abnormal. Practically all the 



* Sixteenth annual report. Hatch Experiment Station. 



