FIELD EXPERIMENTS WITH FERTILIZERS. 209 
this reason it is much fairer in judging of the effects of nitrogen 
to compare the composition of the crop on the mineral plots 
(6a and 64) with that on plots having nitrogen in addition to 
the mineral fertilizers. ‘Thus, if we compare plots 7, 8, and 9 
with 6a or 64, we find that the percentages of protein* in 
both corn and stover are higher where nitrogen was used, 
and that the percentage of protein gradually increases 
with the quantity of nitrogen used. This is likewise true, 
with one exception, plot 11, in the corresponding plots 10, 
Ir and 12. ‘This tends to show that the benefits obtained from 
the use of nitrogenous fertilizers on corn are two-fold. Up to 
a certain limit they tend to increase the yield of crop, and like- 
wise increase the proportion of protein, and hence the feeding 
value of the crop. 
TABLE 64. 
SPECIAL NITROGEN EXPERIMENT ON CORN. 
Percentages and pounds per acre of dry matter and of protein. 










: g | YELLOW FL iintT Corn. | YELLOW FLint Corn. 
7 a8 GRAIN. STOVER. 
FERTILIZERS. 3075 
me (North Plots.) =o | : ae oa a 
| - i r ; 
o ~ Mate ae Protein.* mr lee Protein. 
3; Lbs. | # |Lbs.| % |Lbs.| ¢ |Lbs.| # | Lbs. 
Gee Nothing, >> - b= lar, 6(1486) 9.90) 147156. 3/177417.75) 139 
{ Mix’d Minerals, as No. 6a, 480 } | | Laat onlay 
1 Nit. of Soda (25 Ibs. N.), [160 | '70.512769 9.34) 259 57.7|297215 57 
Mix’d Minerals, as No. 6a,|480 } 6 6 “AD 6a haoes 
ae of Soda (50 Ibs. N.), 1320 f |70°9|3499|10-76| 370/53.0 2975)9.9 
{ Mix’d Minerals, as No. 62,|480 } | Gel asslen closzalaeod mene 
91) Nit. of Soda (75 Ibs. N.), pe FasL SER Sse 2/505) 2O7 017308 
§ Dis. Bone-black, | Mxd § |320 } | ; bialat " 
ee { Mur. of Potash, | Min. / |160 { coe Lez eels ee | 35/5 +37 5 
) Mix’d Minerals, as No. 6a,/480 } = . Gaire Glacaales . 
he) Sulph. of Am. (25 Ibs. N.),|120 § EPPA Bi) eh eS So) Bee P 45) 195 
Mix’d Minerals, as No. 6a,|480 } ae 6.33102/6.25| roa 
oe ia Ge AaN(s01bs..N.),|240.5 |7°°9/2377) 9-7) 329)40- 3) ome 
* { Mix’d Minerals, as No. 6a, 360) 77.3|4000/11.13| 445 51.2 2964'8.54 253 
( Sulph. of Am. (75 Ibs. N.),|360 | | 
oO Nothing, - 73.1/1367|10.22) 140/53.9,1775 6.70) I19g 
66, Mix’d Minerals, as No. aa Ao 73.2|2422| 9.38| 227/56.4/2623/5.07| 133 
_ 







* The protein is estimated by multiplying the nitrogen by 6.25. The percentages of 
protein are those of the dry matter. 
