852 Report oF THE HORTICULTURAL DEPARTMENT OF THD 
clusive that lettuce can be forced much more successfully by 
using manure than by using commercial fertilizers alone. 
With the higher percentages of manure the influence of the 
nitrogenous commercial fertilizers is much obscured as the vari- 
able results with the 15 per ct. and 20 per ct. applications show, 
but with the 5 per ct. and 10 per ct. applications results were 
obtained which may give some indication of the comparative 
value of these fertilizers when combined with the smaller per- 
centages of manure. An examination of Tables V to IX with 
reference to the variation in yield which followed the use of the 
various nitrogenous commercial fertilizers in combination with 
5 per ct. and 10 per ct. of manure shows that a better crop was 
obtained with dried blood than with nitrate of soda in 16 tests, 
while the reverse was found in but 3 tests, and in one test there 
was no difference in yield. The yield with dried blood was better 
than that with sulphate of ammonia in 7 tests while the reverse 
was found in but three tests. The yield with dried blood was 
better than with dried blood combined with nitrate of soda in 
11 tests while the reverse was true in 9 cases. In many in- 
stances the differences in yield are too slight to be of themselves 
significant but taken in the aggregate they do seem to indicate 
that the dried blood combined with moderate quantities of 
stable manure is more effective in stimulating the growth of 
lettuce than either nitrate of soda or sulphate of ammonia 
similarly combined. Also they indicate that the dried blood 
does as well for this purpose when combined with manure as 
does the combination of nitrate of soda, dried blood and manure. 
HOW MUCH MANURE SHOULD BE USED? 
The question then arises: How much manure may be used 
with profit in forcing lettuce? According to our experience and 
observation gardeners ordinarily use from 5 per ct. to 20 per ct. 
by bulk and more often approach the 20 per ct. than the 5 per ct. 
rate. The results where manure was used in combination with 
dried blood will first be examined. They are arranged in the 
following table such a way that the yield under each treatment 
may be compared with the yield of the corresponding check. 
