50 STORRS AGRICULTURAL EXPERIMENT STATION. 
of green crop at harvest are about twice as great on the sec- 
tions supplied with only mineral fertilizers as on those on which 
no fertilizer was applied. The average of the yields on the two 
sections supplied with mineral fertilizers only was practically | 
the same as the average of the yields from all of the plots to 
which nitrogen was added with the minerals. In this experi- 
ment there was some increase in yield where the larger quan- 
tities of nitrogen were used in the fertilizers, but not at all in 
proportion to the increase of nitrogen used. In nearly all of 
our experiments with this crop covering a period of twelve 
years there has been very little relation between the yields of 
the crop and the quantities of nitrogen used in the fertilizer. 
TABLE 12. 
SPECIAL NITROGEN EXPERIMENTS ON COW PEA FODDER. 
Weight and cost of fertilizers per acre, total crop, and increase of 
crop over that of the nothing plots. 












: cepa A 
| FERTILIZERS PER ACRE. B come S,, 
AX | D + comes, 8 2 
| aes See ‘Se 
oa =| its ae vs © 
m | Kind. 2 g | ge ao ea 
| e ps a © 
I,bs $ | Lbs.| Lbs. |Tons.| Lbs. 
0} Nothing, Bs - fe os 2 em —_— 345 | 8,625) 4.3; — 
ixe inerals, as No. 6a, - | 480 
7| |( Nitrate of Soda (25 lbs. N.), | 160 9:64 | 600") 15,000) 7 a 
Mixed Minerals, as No. 6a, - | 480 
8 Nitrate of Soda (50 lbs. N. 1.320 13.14 | 586 | 14,050 | 73 
| ( Mixed Minerals, as No. 6a, - | 480 WU Ve ne rr h. O; 
9|) Nitrate of Soda (75 lbs. N.), | 480 PAd 2° 25 ; 75750 
Dis. Bone-black, | Mixed 320 ) 
ae | Mur. of Potash, | Minerals. 160 § 6.14 | 005") .10,025 3819 
: | Mixed Minerals! as No. 6a, - | 480) ose 6 6 8 8 
Sulph. of Am. (25. Ibs, N.); - | 1204 | 20:27 | B70 TO) fool ec 
Se '( Mixed Minerals, as No. 6a, - | 480 : 6 
} Sulph. of Am. (so Ibs, N.), - | 240 § | *4:39-[ 720 4 10000 |) 9:55) Rees 
rea Mixed Minerals, as No. 6a, - | 480 iodo Mere : 
) Sulph. of Am. (75 Ibs. N.), - | 360 5 20) 250 tO ee 
00} .Nothing;: > .- - — — 335 | 8,375 | 4.2) — 
64| Mixed Minerals, as Ray 6a, - | 480 6.14 | 705 417,625) 8.8 \<o0125 





For some reason not accounted for, the yield of cow pea fodder 
in 1900 was larger on the series of sections on which sulphate 
of ammonia was applied than on the corresponding sections on 
which nitrate of soda was applied. This was not so in the 
