190.2.] PUBLIC DOCUMENT — No. 33. 43 



It should be noticed that plots 1 and 3 — manure alone — 

 gave most hay, while plots 2 and 4 produced most rowen. 

 This is undoubtedly due to the larger proportion of clover 

 on these plots. Attention has been repeatedly called in 

 previous reports to the fact that the free use of potash in- 

 variably tends to increase the percentage of clover in mow- 

 ings. Combining the yields of hay and rowen, we find 

 that manure alone has produced crops at the rate of 6,(3(30 

 pounds per acre, while the lesser quantity of manure and 

 potash has yielded 6,390 pounds. Here is a difference 

 at the rate of 270 pounds per acre in favor of the larger 

 quantity of manure alone. It is estimated that the manure 

 alone, if purchased, is applied at the rate of $30 worth to 

 the acre ; the lesser quantity of manure and the potash used 

 with it are applied at a cost of $23.60. We have, then, 

 2 70 pounds more hay produced where the annual cost of 

 manuring amounts to $6.40 per acre more than where the 

 smaller crop is produced. Our results, then, for the past 

 year are clearly favorable to the lesser manure and potash. 

 The results of the two systems of manuring up to date may 

 be briefly summarized as follows : — 



1. The corn crops have been substantially equal in value. 



2. The hay crops have been slightly larger on the plots 

 receiving the more liberal application of manure alone ; but 

 these increases have been produced at a cost, where manure 

 is estimated at $5 per cord in the field, greater than their 

 value. 



X. — Special Corn Fertilizer v. Fertilizer Richer in 



Potash. 



The object of this experiment, as has been fully explained 

 in previous reports, is to determine the most profitable 

 combination of fertilizers to be used for the growth of corn 

 in rotation with grass and clover, and especially to test the 

 question as to whether the " special " corn fertilizers offered 

 in our markets have such composition as is best suited for 

 the production of corn under such conditions. The field is 

 divided into four plots, and two of these plots — 1 and 3 — 

 have yearly received an application of mixed fertilizers, 



