FIELD EXPERIMENTS WITH FERTILIZERS. 105 
On the roots of stubble left on plots 6a, 64, 8 and g, tuber- 
cles abundant. On plots 7 and ro, tubercles quite abundant. 
Plots 11 and 12, fewer tubercles than on the other plots. 
From these notes it will be seen that of the fertilized plots 
having nitrogen in the fertilizer used, the smallest yields were 
obtained where the fewest tubercles were found. It is also of 
interest to note that the yields on the mineral plots were fully 
equal to those obtained where nitrogen was used in addition to 
the minerals. In fact, the largest yield obtained was 6a, 
where only minerals were applied. The yields of the green 
crop per plot as harvested, and the yields per acre for each 
plot on the basis of 80 per cent. water, are given in the 
following table. It will be noticed that the yields on the 
fertilized plots are entirely independent of the quantities of 
nitrogen used. This tends to confirm our experience with 
this crop in past years; indicating that the crop can be readily 
grown on soils of moderate fertility, without the use of nitro- 
genous fertilizers. 
(iB 26. 
SPECIAL NITROGEN EXPERIMENT ON COW PEA VINES. 
Weight and Cost of Fertilizers per Acre, Total Crop and Increase 
of Crop over that of the Nothing Plots. 


















vn a Cow PEA VINES. ve 
S =p 8 a3 
ae veo é ro) 
3 Seas Be eats eitke Gl viid pene eras 
Ay Fhe iH |oes Acre. 2 2 S 
“ + 2 %| 80 % Water. 3 ° AM 
a We | $ Pree Lbs. | Tons. Tone 
0; Nothing, - : : ‘a a 222 |10435| §.2:| — 
_| | Mixed Minerals, as No. 6a, eg LNs rere it on6 be 
f Nitrate of Soda (25 lbs. N.), — - pe Sean ee oo 
Mixed Minerals, as No. 6a, - 14 of BER Culiel GGulk SOA Deere ke 
: Nitrate of Soda (so Ibs. N.),_- 320 et Dilek Or Wh 8 
Mixed Minerals, as No. 6a. - |480 rare etna res s 
1 Nitrate of Soda (75 lbs. N.), r 480 Bega rae 5 ot fides 
a| § Dissolved Bone-black | Mixed 320 Sag a an 2% 
“| Muriate of Potash, { Minerals ie 443 595 3 
Mixed Minerals, as No. 6a, = 1499 (| ro. RAL OHOT ELE 
( Sulphate of Ammonia (25 Ibs. N, is ae aa ded 450 | ie 
Mixed Minerals, as No. 6a, - 1490 (| 16 88 | 420 | 18660 4 
es 1 Sulphate of Ammonia (50 Ibs. N.), pS 429 SE Bi 
Mixed Minerals, as No. 6a, - 490! | 05 20 Pee hn eerar Mabey 
Sulphate of Ammonia (75 Ibs. N.), 360 J 32 | 43 dl 9 4-3 
00} Nothing, - SN Dero oom 228 |10715| 5.4} — 
64) Mixed Metals as No: nee - |480 8.00 | 434 | 20400 | 10.2] 4.9 
= ( 

