350 Report op the Horticultural Department of the 



GENERAL DISCUSSION OF THE RESULTS. 



What is the testimony of these experiments on the question 

 as to whether nitrogenous commercial fertilizers may be used 

 with profit in forcing lettuce either with or without stable 

 manure? The data which have already been presented will now 

 be considered with reference to their bearing upon this question. 



RESULTS FROM USING THE OOMMBRCIAL FERTILIZERS WITHOUT 



MANURE. 



Both on the sandy loam and on the clay loam, where no manure 

 was used the addition of the commercial fertilizers resulted in 

 a decided increase in yield over the untreated soil. On the clay 

 loam the nitrate of soda generally appeared to be more beneficial 

 than either the dried blood or the dried blood combined with the 

 nitrate of soda, and with one exception did equally as well or 

 better than sulphate of ammonia. On the sandy loam it was 

 not so beneficial as dried blood except with the first crop, when 

 it proved somewhat better; but it proved superior to sulphate of 

 ammonia except with the second crop. The use of lime with the 

 nitrate of soda gave an improved crop on the sandy loam but 

 decreased the crop on the clay loam. 



The results with sulphate of ammonia without manure were 

 very variable with the dififerent crops. On clay loam it was 

 superior to both nitrate of soda and dried blood in the first crop 

 and inferior to both in the last. On the sandy soil the results 

 were also variable; in one instance it gave the highest yield with 

 the crop of loose lettuce, and it was generally more or less 

 superior to the nitrate of soda but inferior to dried blood. 



The dried blood when used without manure generally gave 

 better results on the sandy soil but not so good results on the 

 clay soil as the commercial fertilizers did with which it was 

 compared. 



RESULTS FROM COMBINING THE COMMERCIAL FERTILIZERS WITH 



MANURE. 



When manure was applied in addition to the commercial fer- 

 tilizers very much better cro])S were obtained than when the 

 latter only were used. This is clearly shown in the following 



