EFFECT OF NITROGENOUS FERTILIZERS. 125 
— gredients and different quantities of nitrogen, as compared with the 
and the corresponding profits. 






oa Ca peel ears OF INCREASE 
Cotiof ield of hay, } AT $x2.00 PER TON. Yield of 
f eceliner: Ir ee veld ie protein per oe 
. plots. Total. Net. * Paee 
$ Ibs. Ibs $ $ lbs. 
BPTI Sec.lora' a « 1,639 ere ave Meee: cilise he wie els ee 117 O 
get 3,724 1,030 6.18 3.05 289 
Fo533 4,837 2,143 12.86 6.61 420 8 
15.46 5,003 2,309 13.85 4-47 480 9 
6.08 Bi 5 Xi gn A ieR Laat cuonmiviterteacherace <ierti'sl ood ase. + spate 214 6a 
9.83 3,804 1,110 6.66 2.91 285 10 
13.58 4,807 251g 12.68 5.18 410 II 
17.33 51136 2,442 14.65 3-40 487 12 
Mat ghia ats 2.244 MD Peer this: held an are eee ore Ce 165 oo 
6.08 il MMM ro caterers oi he ale he att | ee tees ee 227 64 

Summary of field experiments with corn made between 1878 and 1889. 
Eighteen Four Three 
Special nitrogen experiments, experiments, experiments, experiments, 
1878-81. 1888. 1889. 


Bush. per acre.| Bush. per acre.| Bush. per acre. 
Mixed minerals, . : : : 43.0 33.4 i182 
Mixed minerals +25 lbs. nitrogen, 48.4 38.2 Zee 
Mixed minerals +50 lbs. nitrogen, 48.8 40.2 327 
Mixed minerals +75 lbs. nitrogen, 49.6 Bone 

34.0 


quantities of nitrogen, are given in Table 6 on the following 
page. The figures for yield per acre represent, in each case, 
the average of the yields of dry matter from all the plots upon 
which the same kinds and amounts of fertilizers were used. 
The amounts of dry matter in the yield are calculated from the 
weight of the crop when it was harvested, upon the assumption 
