118 HATCH EXPERIMENT STATION. [Jan. 



on the plot where manure has been annually api)lied at the 

 rate of 5 cords per acre. The experiment strikingly shov\'S 

 the great importance of the liberal supply of potash in fer- 

 tilizers for the corn crop. B. Soil test with grass and 

 clover. The nitrate of soda, whether used alone or in com- 

 bination, caused a large increase in the first crop. The use 

 of potash without lime had little effect upon the crop. 

 Where potash has been used continuously for fifteen years, 

 with two heavy applications of lime (in 1899 and 1904), the 

 effect on the proportion of clover and on total yield was 

 very marked. The most profitable crop produced by any 

 fertilizer combination was obtained upon the plot to which 

 dissolved l)one-black and muriate of potash have been con- 

 tinuously applied. On the limed portion of this plot the 

 yield is at the rate of 0,100 pounds of haj'. The annual 

 cost of the fertilizers ap})lied to this plot has been $7.50. 



VI. — To determine the relative value in crop production 

 of a fertilizer mixture rich in potash, as compared with one 

 representing the average of the special corn fertilizers pur- 

 chasable in our markets. The result of this year is sub- 

 stantially equal crops under the two systems of manuring, 

 at a cost of rather over $5 per acre less for the combination 

 of fertilizers richer in potash. 



VII. — To determine the relative value in corn production 

 of a moderate application of manure alone, as compared with 

 a smaller application of manure used in combination with 

 160 pounds of high-grade sulfate of potash per acre. The 

 result of this year w^as crops under the two systems equal in 

 amount of stover, but an average at the rate of 5 bushels of 

 grain per acre less on the combination of manure and potash 

 than on the manure alone. The difference in crop is not 

 sufficient to cover the excess in cost of the larger amount 

 of manure alone, as compared with the lesser amount of 

 manure and potash. 



Vin. — To determine the economic result of using in 

 rotation on grass lands, the first year, barnyard manure, 

 8,000 pounds per acre ; the second year, wood ashes, 1 ton 

 per acre ; and the third year, bone meal, 600, and nmriate 

 of potash, 200, pounds per acre. The average yield of hay 



