STABLE MANURE AND NITROGENOUS 
CHEMICAL FERTILIZERS FOR 
| FORCING LETTUCE.* 
S. A. BEACH AND H. HASSELBRING. 
SUMMARY. 
In the experiments here reported nitrogenous commercial fer- 
tilizers were compared with each other as to their effect on the 
forcing of lettuce. The particular forms in which they were 
tested were dried blood, nitrate of soda, dried blood and nitrate 
of soda combined, and sulphate of ammonia. With each of these, 
acid phosphate and muriate of potash were used in quantities 
designed to exceed the needs of the crop. 
The use of these commercial fertilizers without stable manure 
resulted in a decided increase in yield over crops on correspond- 
ing untreated soil but proved inadequate for forcing the lettuce 
in a sufficiently short time to be profitable. On the clay loam 
with no stable manure a better yield was generally obtained 
where nitrate of soda was used than where either sulphate of 
ammonia or dried blood was used. On the sandy soil the results 
with dried blood were generally superior to the results with the 
nitrate of soda or sulphate of ammonia. With sulphate of 
ammonia the results were very variable. 
Dried blood combined with the smaller percentage of manure, 
gave, in the aggregate, better results than either nitrate of soda 
or sulphate of ammonia similarly combined. 
The best crops were grown where the soil was fertilized with 
stable manure. 

*Reprint of Bulletin No. 208. 
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