24 HATCH EXPERIMENT STATION. [Jan. 



spring that it was decided to plow them up. The unliealthy 

 condition is thought to have been connected with a deficiency 

 of lime in the soil, and these plots accordingly received an 

 application of freshly slaked lime at the rate of about 1 ton 

 to the acre. They were then plowed and reseeded to the 

 same varieties of clover. The crops were cut on August 11, 

 but, being much mixed with weeds, as was to be expected 

 in the case of spring-sown clover, the product was not 

 weighed. The Alsike clover upon the plots sown in the 

 summer of 1904 gave one fair crop. 



The yield on the muriate was at the rate of 3,986 pounds 

 per acre ; on the sulfate, 4,000 pounds. These figures do 

 not accurately indicate the relative condition of the clover, 

 for the growth on both plots was somewhat mixed with other 

 grasses, which were much more abundant on the muriate of 

 potash than on the sulfate, where the clover was very clearly 

 much superior to that on the other plot. The rhubarb on 

 both pota,sh salts gave a heavy growth. The rates of yield 

 per acre were as follows : — 



Muriate v. High-grade Sulfate of Potash (^Rhubarb') . — Yields per Acre 



(^Pounds) . 



Fertilizers used. 



Stalks. 



Muriate of potash, 

 Sulfate of potash, 



•23,148 

 23,729 



19,249 

 20,344 



These yields are much heavier than last year, as the 

 rhubarb is now more fully estal)lished, and the diflerence in 

 favor of the sulfate of potash is still greater than previously. 



HI. — Comparison of Different Potash Salts for 

 Field Crops. (Field G.) 



This experiment for comparison of different potash salts was 

 begun in 1898. The field contains forty plots, of about one- 

 fortieth of an acre each. The plots are fertilized in five series 

 of eight plots each, each series including a no-potash plot and 

 one plot for each of tlie potash salts under comparison. Those 

 salts are kaiiiite, liigh-gradc sulfate, low-grade sulfate, muriate, 



