No. 4.] THE HAY CROP. 371 



If fertilizers alone are used for the preceding hoed crops, 

 these must be rich in potash if clover is to thrive when the 

 land is seeded. 



Upon the college farm at Amherst we have for about thir- 

 teen years applied potash to two plots of one-quarter acre 

 each at the rate of about 250 pounds per acre of a high- 

 grade potash salt. To two other plots the same salt has 

 been applied at the rate of about 150 pounds per acre. 

 When this land is seeded, the hay crop where the larger 

 amount of potash is used is considerably larger and contains 



Clover on Muriate of Potash makes a Poor Growth. 



a much greater proportion of clover than where the smaller 

 quantity of potash is used. In 1902 the larger application 

 of potash gave a yield at the rate of 6,772 pounds per acre ; 

 the smaller application of potash yielded at the rate of 5,252 

 pounds per acre. For a full understanding of the conditions 

 in this experiment, it should be further stated that the 

 quantity of nitrogen a})plied to the two sets of plots is 

 substantially the same, while the plots receiving the lighter 

 application of potash annually receive an application of 

 acid phosphate at the rate of about 1,100 pounds per acre, 



