Experiments upon Wheat, Barley, and Swedes. 313 
with 33G lbs. of nitrate of soda per acre. These show respectively 
288 6, IGD'O, and ol2'5 lbs. as the amount of increase per 100 lbs. 
of nitrate of soda used, or an average of 257 lbs. Hence in both 
these cases the heavier the dressing, even up to 3 cwts. per acre, 
the greater was the relative effect. In the third place, taking the 
results obtained by Mr. Smitli, of Bibury (see Table IX.), with 
dressings of 168 lbs. per acre, three plots in this case gave respec- 
tively 262, 262, and 309 5 lbs., or an average increase of 277"8 
lbs. of grain per 100 lbs. of nitrate of soda employed. Comparing 
this with a solitary plot, also at Bibury, manured with 80 lbs. per 
acre of the salt, we find an increase of 150 lbs. of grain. In all 
these cases, then, we have a clear answer in favour of li over 
^ cwt., and a fair presumption that even heavier dressings may 
be applied economically. 
Lastly, Mr. Edmund Ruck's experiments (Table X.) furnish 
the results of four plots, each manured at the rate of 168 lbs. of 
nitrate of soda per acre, the increases being as follows : 176, 212, 
188, and 212 lbs. per acre, or an average of 197 lbs. per 100 lbs. 
of the nitrate applied. 
Table X. — Me. Euck, Beatdon Mange Faem, 1869 — Experiments on Wheat. 
c 
<u 
5 
u. 
1=1 
tn 
■° ^ 
.5 " ^ 
_o 
c 
« ■ 
c 
'5 
c — ^ 
> t3 
" 3 
g 
1^ %^ 
o ii o 
PLOTS Acre each). 
"3. 
o. 
iitity of 
ed per A 
5 
o 
5 
o 
; over 
nianu 
ere. 
CJ ^ 
S 9 
m 
S 1^ 
2 '•Si 
o 
"S 
p 
c 
OOP. 
bz: 
Apr. 13 
May 13 
lbs. 
lbs. 
lbs. 
lbs. 
lbs. 
Nitrate of soda (applied at twice) j 
[ 168 
123 
24G0 
296 
176-1 
24 
Nitrate of soda (applied at twice) | 
Apr. 13 
May 13 
1 168 
126 
2520 
356 
212-0 
24 
Apr. 13 
168 
124 
2480 
316 
188-1 
24 
Apr. 13 
B'eb. 23 
Feb. 23 
168 
126 
2520 
356 
212-0 
24 
336\ 
16S/ 
117 
2340 
176 
104-9 
42 
Feb. 23 
Feb. 23 
336\ 
16«/ 
135 
2700 
536 
319-0 
4 2 
Fob. 23 
Apr. 13 
33„1 
168/ 
136 
2720 
556 
330-9 
42 
Feb. 23 
Apr. 13 
3361 
168/ 
130 
2600 
436 
259-5 
42 
Apr. 13 
Apr. 13 
336 \ 
168/ 
131 
2620 
456 
271-4 
42 
hawes' superphosphate 
Nitrate of soda 
Apr. 13 
Apr. 13 
336\ 
168/ 
168 
3300 
1196 
711-9 
42 
110 
2200\ 
lU 
108 
103 
2280 1 
2160. 
•-'060 1 
2164= average of 5 iin- 
manured Plots. 
106 
2120,' 
