10 



RESULTS OF THE ADDITION OF POTASH TO 



Nothing 



Hard corn, bushels per acre, 9.5 



Soft corn, " " .3 



Stover, pounds " 1660 



Value of net average increment, $6.59 



Financial result, 3.39 gain 



RESULTS OF THE ADDITION TO NOTHING OF 



Complete Barnyard Land 



Fertilizer. Manure. Plaster. Lime. 



Hard corn, bushels per acre, 13.7 15.1 -5.1 -7.4 



Soft corn, " " .4 .2 



Stover, pounds '^ 1503 2268 -83 -437 



Fertilizer Manure Plaster Lime 



Value of increment due to $13.47 $16.24 



Value of decrease due to $3.72 $6.28 



Financial result. 1.47 gain 8.76 loss 4.44 loss 7.24 loss 



The results of the use of nitrogen and potash are quite similar in 

 kind, though potash causes the larger and the only profitable increase. 

 It is noticeable that both appear to cause a large increase over 

 nothing, i. e., where used alone ; but little increase where used with 

 either of the other elements alone ; and a large increase where used 

 with both the others. This indicates, to my mind, a considerable 

 degree of general exhaustion. The addition of nitrogen to potash 

 alone could not increase the crop much because phosphoric acid was 

 wanting ; neither could a similar addition to phosphoric acid produce 

 much increase because potash was wanting : but add nitrogen to both 

 phosphoric acid and potash and the result is a considerable increase. 

 Similar reasoning applies to potash. True, the large increase over 

 nothing in the case of the use singly of either nitrogen or potash is 

 inexplicable on this theory. I can but conclude that this increase 

 was due to natural inequalities in tlie soil rather than to the fertilizer 

 used. 



Phosphoric acid does not appear to have been as much required as 

 either of the other elements. That it decreased the crop as indicated 

 in two cases is not supposed to be the case. This result must have 

 been due to accidental causes. It is noticeable that the largest 

 increase was where phosphoric acid was added to nitrogen and potash. 



