“FIELD EXPERIMENTS WITH FERTILIZERS. 51 
experiments of previous years. On the whole the experiments 
with cow peas seem to indicate that as far as the yields of the 
crop are concerned good results are obtained from the use of 
mineral fertilizers, but that nitrogen in addition to the min- 
erals has very little effect upon the yields. 
TABLE 13. 
SPECIAL NITROGEN EXPERIMENTS ON COW PEA FODDER. 
Percentages and aie ees acre ie Sle matter and cee UES 






















: | Percent. of 
= FERTILIZERS PER ACRE. E ~ g e pigld ee ee 
a = os = Sa ltrom ait ral 
Ga | ay Se ce lots 
3 re) eae E Oo 5 P 
> Ce, 
3S we oR ae Ee hice sR Nip 
Z Kind. “ > Q 2 Ps Es 
= “4 | SI Pes) 
bss vps: % Lbs. % Lbs) % % 
o| Nothing, - — | 8,625)19.64|1,694)18.25/309) 54 54 
Mixed Rinersle as No. bon 480 - | 
aaanee Soda (25 Ibs. N.), ek EE NUS 8 ea ES 023} O2 tO 
{ Mixed Minerals, as No. 6a, |480 ) | 
) Nitrate of Soda (so Ibs, N.), [320 f | £4°059|22-05| 3,084/17.13/528) 98 | 92 
Mixed Minerals, as No. 6a, |480 . 
Nitrate of Soda (75 lbs. N.),|480 EO 2 5E150 05). 5,13 3/13. 001504) 100 Wee os 
Dis. Bone-black, (| Mixed § |320) ri é 
8 Mur. of Potash, Min'ls, PhO Hee 2 LP 21 O)3,010118 7441557 
Mixed Minerals, as No. 6a, |480 | 
8 Potion. of Am. (25 lbs. N.), a ROT EB OR) 20413-00287 F522 CO" a Ok 
{ Mixed Minerals, as No. 6a, |480 | 
at) Galph. of Am. (50 Ibs, N.), 240 § | £9°000|19 02] 3:014|18.75/678| 115) |, 118 
Mixed Minerals, as No. 6a, |480 | 
12 Sulph. of Am. (75 Ibs. ne ) 360 20,250|16. 39/ 3,319|18.56|616| 106 | 108 
oo| Nothing, - — | 8,375|19.90] 1,667|18.31/305| 53 tes 
64| Mixed anerals. as No. oe 480 |17,625|/18.49| 3,259/18.06/589| * * 

~* The average of the yields on plots 6a and 60 is here taken at 100 for comparison. 
The amount of nitrogen in the fertilizer and the proportions 
of protein in the crop.—The results in Table 13 show the effect 
of the nitrogen of the fertilizers upon the yields of dry matter 
and protein in the cow pea fodder. It will be seen that in gen- 
eral there is very little relation between the percentages of 
protein in the crop and the amounts of nitrogen used in the 
fertilizer. For example, the percentage of protein is highest 
in the crop on the section on which the small ration of nitrogen 
was applied in nitrate of soda, while the lowest percentage of 
protein was in the crop on the section on which the medium 
ration of nitrogen was applied in nitrate of soda. When yields 
