1897.] PUBLIC DOCUMENT — No. 33. 17 



In no one of the six years during which this experiment 

 has been continued has the crop raised on the combinati.on 

 of manure with potash e(_iualled that raised on a larger 

 quantity of manure alone ; but the differences have been 

 small, and in no case has the value of the excess in crop 

 produced by the larger (juantity of manure been sufficient 

 to cover the excess in cost of the manure applied. The 

 difference in crop is this year considerably larger than in 

 any preceding year ; and, as this difference has been quite 

 steadily increasing, we are justified in concluding that the 

 manure and potash in the quantities employed cannot fully 

 take the place of the larger application of manure in con- 

 tinuous corn culture. It is true the crop where the manure 

 and potash are employed is still an excellent one, averaging 

 for the two plats at the rate of more than 63 bushels per 

 acre. Continuous corn culture is not, however, the rule, 

 nor indeed under most circumstances advisable, though 

 often proved to be possible, at least for many years ; and 

 therefore this land has now been seeded to grass and clover, 

 for the purpose of determining to what extent, if any, the 

 introduction of these crops will enable the farmer under the 

 given manuring to secure equal crops with both systems. 



2. Special Corn Fertilizer v. Feitilizer containing More 



Potash. 



This experiment in continuous corn culture was begun in 

 1891, and the present is, therefore, the sixth season. The 

 object in view is a comparison of the results obtained with a 

 fertilizer proportioned like the average of the ' ' special " coim 

 fertilizers found upon our markets in 1891 with those ob- 

 tained with a fertilizer richer in potash but furnishing less 

 nitrogen and phosphoric acid. The results in previous years 

 have indicated the financial advantage to lie with the latter 

 fertilizer. 



Four plats of one-fourth of an acre each arc devoted to 

 this experiment, which are respectively numbered 1, 2, 3 

 and 4. 



The materials applied to the several plats are shown 

 below : — 



