New York AGRICULTURAL EXPERIMENT STATION. 23 
of 850 Ibs. of dried blood and 100 Ibs. nitrate of soda per acre. 
The amount of nitrogen thus applied was approximately the 
same in each case. 
The use of these commercial fertilizers with no manure was 
followed by a much better yield of lettuce than that produced 
by similar soil not fertilized. On the clay loam the use of the 
nitrate of soda without manure was followed by a better yield 
than followed the use of either sulphate of ammonia or dried 
blood without manure. On the sandy soil without manure dried 
blood generally gave better results than either the sulphate of 
ammonia or the nitrate of soda. With sulphate of ammonia 
and no manure the yields were very variable. These nitrogen- 
ous fertilizers alone, in the amounts applied, proved inadequate 
for forcing lettuce in a sufficiently short time to be profitable. 
Very much better crops were obtained when stable manure was 
added. 
The higher percentages of manure when combined with the 
nitrogenous commercial fertilizers above named obscured the 
action of the latter so that it was not possible to decide that any 
advantage was obtained from adding them with the manure. 
With the smaller percentages of manure (5 per ct. and 10 per 
et.) the addition of dried blood gave in the aggregate better 
results than either nitrate of soda or sulphate of ammonia simi- 
larly combined. 
When 5 per ct. of manure was added to the soil with the com- 
mercial fertilizers referred to, the yields were invariably very 
much increased over those obtained with the same fertilizers 
and no manure. Double, triple and quadruple portions of 
manure increased the yield of the first crop but not to a ‘cor- 
responding extent. With succeeding crops the cumulative effect 
of successive heavy applications of manure was seen in the 
actual decrease of the yield below that obtained with more mod- 
erate applications of manure. 
In forcing lettuce it is not uncommon for gardeners to use 
from 5 per ct. to 20 per ct. of manure. The amount which they 
use doubtless most often approaches the 20 per ct. rate. In 
