48 



MASS. EXPERIMENT STATION BULLETIN 196. 



Table VI. — Average Yields. 



Table VII indicates the number of times out of the twelve (the total 

 number of years during the period when manure was generally applied 

 annually) in which the yield on N was superior to that on S. 



Table VII. — General Results. 



Plot. 



North Half 

 ahead — 



1, 

 2, 

 3, 



4, 

 5. 



4 years out of 12 



5 years out of 12 

 2 years out of 12 

 7 years out of 12 

 1 year out of 12 



Examination of this table shows that on plot 3, S almost invariably 

 gave the larger yield, N being superior to it only two years out of twelve. 

 This maj^ be explained by the greater fertility or better phj'sical condition 

 of S on plot 3, as shown by the yields given in Table II. On plot 5 the 

 general superiority of S was still more marked, N giving the larger jdeld 

 only one j^ear out of twelve. It will be remembered that the manure 

 applied to plot 5 was from horses, whereas that apphed to all the other 

 plots was from a herd of well-fed dairy cows. As has been pointed out, 

 this stable manure was usually comparatively fresh, yet it had without 

 doubt undergone more fermentation previous to being taken to the field 

 than had the cow manure applied to the other plots. The effect of this 

 greater progress toward complete disintegration at the time of spreading 

 must have been to increase the proportion of soluble matter in the manure, 



