34 
STORRS AGRICULTURAL EXPERIMENT STATION. 
part from the nitrate’of soda and part from the sulphate of am- 
monia plots. 
One sample of corn stover was from the. crop 
grown on a plot supplied with the mineral fertilizers alone. 
The results of the tests are given in the following table. 
TABLE 19. 
Amount of nitric nitrogen found in different crops. 


| Laboratory No. 
6200 
6201 
6202 
6203 
6216 
6217 
6218 
6219 
6248 
6249 
6250 
6251 
6257 
6260 
6268 
6270 
6278 
6281 
6288 
6291 
6308 
6311 
6318 
6321 
6274 


MATERIAL. 
Orchard grass, - - 
Orchard grass, - - 
Orchard grass, - - 
Orchard grass, - - 
Hungarian grass, - 
Hungarian grass, - 
Hungarian grass, - | 
Hungarian grass, - 
Orchard grass, rowen, 
Orchard grass, rowen, 
Orchard grass, rowen, 
Orchard grass, rowen, 
Silage corn, - - 
Silage corn, ws 
Cow pea fodder, - 
Cow pea fodder, - 
Corn stover, = = 
Corn stover, fe = 
Corn—seeds, -° z 
Corn—seeds, - - 
Corn—seeds,_ - - 
Corn—seeds,_ - = 
Corn—seeds, - - 
Corn—seeds, - - 
Corn stover, - 







Ene | gag | Se. 
oct | Oa bn pacar 
8 5 uae or u 
Kind of experimentand | xa | =DPaq | Dow 
amount of nitrogen used. | a2 | §°G8 | 558 
qo | Yom | QB 
25.0 ies 6.0 ee 
; Bd |R3| MF 
% % % 
Pot exp’ts, full ration, - | 2.56 O78 “| %.026 
Pot exp’ts, full ration, - | 2.41 100 O4I 
Pot exp’ts, full ration, - | 2.46 | .075 O31 
Pot exp’ts, full ration, -.| 2.41 100 O41 
Pot exp’ts, full ration, - | 2.12 100-4 O47. 
Pot exp’ts, full ration, - | 2.16 | .075 | .035 
Pot exp’ts, full ration, - | 2.07 1oo | .048 
Pot exp’ts, full ration, - | 2.25 100 044 
Pot exp’ts, full ration, - | 1.1L [~— “= 
Pot*exp' ts; full ration; =<) 7. 6G — 
Is Pot exp’ts, full ration,“ - |-1¢154) — 
Pot exp’ts, full ration, - | 1,10 — oo 
Plot exp’ts, full ration, - | 1.38 025 018 
| Plot exp’ts, full ration,* 4), 1. 304) 2.074 O10 
Plot exp’ts, full ration, - | 2.64 025 009g 
Plot exp’ts, full ration,*. | 2.75 O13, | .005 
Plot exp’ts, full ration, - | 1.28 O13 O1O 
Plot exp’ts, full ration,* | 1.50 | .013 | .009 
Piot exp'ts, fullration,=9) 1,13.)) = — 
Plot exp’ts, full ration,* “O39 aheusrs aS 
Plot.exp ts, full ration, "|" 1.60) == — 
Plot exp’ts, full ration,* | 1.63 | — —— 
Plot exp’ts, full ration, - | 1.75 — — 
Plot exp’ts, full ration,* | 1.50 — — 
Plot exp’ts, no nitrogen, $3) a= — 
* In these experiments the nitrogen was supplied in sulphate of ammonia, in the 
others in nitrate of soda. 
In making these tests, the colorimetric method devised by 
Hooker and described by Wiley* was employed, with but little 
modification of the procedure. 
The basis of this method is the 
blue coloration produced by small quantities of nitrates in a 
sulphuric acid solution of diphenylamine, the intensity of the 
color differing with differences in the quantity of nitrates 
present. 
* Principles and Practice of Agricultural Analysis, Vol. I., pp. 548-554. 
With a little care this method can be used to obtain 
