122 HATCH EXPERIMENT STATION. [Jan. 



silicate. Each is applied annuall}^ to the same plot, and all 

 are used in such quantities as to furnish equal potash to each 

 plot. All plots arc equally manured with materials furnish- 

 ing nitrogen and phosphoric acid. There are forty plots, 

 in five series of eight plots each, each series including a 

 no-potash plot and one for each potash salt used. The area 

 per plot is about one-fortieth of an acre. The crops on this 

 land last year were winter wdieat on one series and ensilage 

 corn on the other four series. On the series occupied by 

 the winter wheat, clover was sown after rcploughi^ng, the 

 last of July. On the four series occupied by corn last year 

 clover was sown in the corn early in August. The clover on 

 the series following w^heat got an excellent start, and w^ent 

 through the winter well. The clover on the other series, 

 owing to the dense shade of the corn, ^\'hich was very heavy, 

 made much less growth, and was to a considerable extent 

 wdnter-killed. On these plots, Nos. 9 to 40, it was neces- 

 sary to sow additional seed this spring. This was done 

 on March 2G, when the soil and weather conditions 

 were favorable. The seed sown at this time started w^ell. 

 The usual fertilizers were applied this spring on April 25. 

 The crop on all the plots was cut on June 11. That on the 

 series which followed wheat was well grown, and the product 

 of each plot was separately weighed. The product of the 

 other plots was much mixed with weeds, which, on account 

 of the winter-killing, were able to make considerable growth ; 

 and it was not considered that the weights would have much 

 value, as indicating the relative ^ield of clover. Before th6 

 clover was cut, however, the plots were carefully examined. 

 It was found that on each of the plots to which kainite had 

 been applied the condition of the young clover was much 

 inferior to that of the clover on the other plots. The color 

 was poor, while many of the plants appeared to be d3ing. 

 This difference was not apparent between the clover 

 plants which had survived the winter on the different plots. 

 Examination disclosed the further fact that there was a 

 somewhat similar degree of inferiority in the condition of 

 th(^ young clover on all of the plots which had received an 

 application either of the low-grade sulfate of potasli or of 

 muriate of potash, as compared with that on the other plots. 



