Il. EXPERIMENTS WITH COMMERCIAL FER- 
TILIZERS IN FORCING HEAD LETTUCE 

S.A, Beacon. 

SUMMARY. 
Stable manure with and without commercial fertilizers was 
tried in clay loam mixtures and in sandy loam mixtures for forcing 
head lettuce. Nitrate of soda was also used in varying quantities 
in connection with stable manure, acid phosphate and sulphate of 
potash. 
On clay loam mixed with 15.5 per cent stable manure by weight 
a slight increase in growth followed the use of nitrate of soda but 
with double this application of manure practically no advantage 
followed the use of nitrate of soda, either on the clay loam or on 
the sandy loam. 
No advantage was gained either on the clay loam or the sandy 
loam from the addition of sulphate of potash and acid phosphate 
when the soils had already received a heavy application of stable 
manure. 
Excellent lettuce was produced on the sandy loam by using com- 
mercial fertilizers with no stable manure. | 
A heavy application of stable manure to the sandy loam put the 
soil in poor mechanical condition and a crop of inferior lettuce 
resulted. 
The mechanical condition of the clay loam was improved by a 
heavy application of stable manure. This mixture produced much 
better lettuce than was grown on the clay loam where commercial . 
fertilizers were used instead of stable manure. 
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* Reprint from Bulletin No. 146. 
