S 
” 7. 
EFFECT OF NITROGENOUS FERTILIZERS. I2I 
been used. The cost of mixing the materials, of transporta- 
tion, etc., is left out of account. The 1899 list of commercial 
valuations adopted by the New England Experiment Stations* 
in estimating the value of fertilizers is used. This represents 
the cash cost of the various ingredients of fertilizers, as found 
in chemicals offered for sale in the larger markets. In many 
cases, especially where considerable amounts of fertilizers are 
used, farmers can buy the fertilizing materials at the prices 
indicated in the list. The prices upon which are based calcula- 
tions of gains in this discussion are as follows: 
Nitrogen in nitrate of soda, . : : . 124 cents per pound. 
Nitrogen in sulphate of ammonia, . : . 15 cents per pound. 
Nitrogen in organic materials (dried blood), . 14 cents per pound. 
Potash in muriate, . : : , , . 44 cents per pound. 
Phosphoric acid (soluble) . ‘ : : . 44 cents per pound. 
All the phosphoric acid used was estimated as soluble, al- 
though a small part of it was probably in the form known as 
reverted phosphoric acid. The proportion in this form could 
not be estimated ; but as the valuation for reverted phosphoric 
acid is only one-half cent per pound less than that for soluble, 
the difference in the final results would be small. 
EFFECTS OF NITROGENOUS FERTILIZERS UPON THE YIELDS, 
AND THE ESTIMATED FINANCIAL GAINS, 
The detailed accounts of the experiments found in earlier 
Reports of the Station give results with regard to the yields 
. and the estimated financial gains. It has seemed advisable 
to summarize briefly these results, indicating the relation be- 
tween the yields of the crops and the quantity of nitrogen used 
in the fertilizer, as well as the relative financial gain resulting 
from the use of different quantities of nitrogen. 
In estimating the financial gains the current market prices 
are taken as bases of valuation of the crops, as these represent 
what the farmers would receive or pay for them. The feeding 
value, however, is influenced considerably by the percentage of 
protein in the crops, which is left entirely out of account in 
buying or selling. For this reason, the proportion of nitrogen 
in the fertilizer that would be most advantageous to the pro- 
ducer if he intended to sell his crop might be considerably less 
* Not yet published 
