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EFFECT OF NITROGENOUS FERTILIZERS. 123 
The mineral fertilizers, when used. alone on mixed grasses, 
were applied at a financial loss, as no material increase in the 
total yield followed their use. They did, however, increase 
somewhat the yield of clover in the crop, which accords with 
the results of experiments with legumes discussed on a later 
page. 
From Table 5, which follows, it will be seen that, with the 
valuation of hay at $12 per ton, in an average of all the similar 
experiments the profits from the use of 160 pounds of nitrate 
of soda (25 pounds of nitrogen), was $3.05 per acre; from the 
use of 320 pounds of nitrate of soda (50 pounds nitrogen), $6.61 
per acre ; and from the use of 480 pounds of nitrate of soda (75 
pounds of nitrogen), $4.47 per acre. The profits from the use 
of the same amounts of nitrogen in sulphate of ammonia were 
somewhat less, because the cost of the fertilizer is greater, 
although the yields of hay were quite similar. 
