86 Experiments vpon Swedes. 
Experiments upon Swedes made at Craigie House, Ayr. 
Plot. 
Cost 
I'roduce 
Manures applied per Iinperiul Acre. 
of Mnmire 
per Imperial 
per 
Acr(?. 
£. 
s. 
d. 
tons. 
cwt. 
lbs. 
"~ 1 
17 
0 
0 
o 
1^ cwt, of sulphate of amniouia 
1 
4 
0 
18 
17 
0 
16 
3 
•J, pwtc ni Qll I T"» 11 M to C\T '1 111 1 n 
2 
8 
0 
20 
17 
2 
i\ 
\j 
A 
2 cwts. of sulphate of ammonia and 3 cwts. j 
Vi. o 11 LH. I IJllk^oU iltV llliLVlV, 1 1 (Jill UUIiC tl&ll,' 
3 
2 
0 
2G 
.3 
1 
and sulphuric acid (dissolved bone-ash) ) 
5 
5 cwts. of dissolved bouo-ush, the same as) 
that used in No 4 j 
15 
0 
26 
15 
1 
12 
1 
6 
5 cwts of dissolved bone-dust 
1 
17 
6 
24 
17 
0 
14 
■ 7 
7 cwts, of dissolved bone-ash the same as^ 
0 
24 
19 
1 
9 
4 
8 
3 cwts. of dissolved bone-3sli, tlie seiii6\ 
1 
1 
0 
24 
0 
0 
0 
sflinplG used in No 4 J 
9 
3 
10 
0 
24 
10 
2 
24 
10 
6 cwts. of* pliosplio-Ptruvitiii gujino 
. 3 
12 
0 
30 
6 
1 
2 
n 
16 
0 
0 
0 
12 
C cwts. of Peruvian guano 
3 
18 
0 
31 
10 
0 
20 
13 
4 
2 
6 
30 
8 
2 
8 
14 
30 tons of Bubliu street-manure, including'! 
3 
0 
0 
24 
8 
2 
8 
15 
5 cwts. of Ritchie's dissolved bones .. 
1 
17 
6 
26 
C 
1 
20 
16 
10 cwts. of Ritchie's dissolved bones 
t 3 
I 
15 
0 
27 
8 
2 
8 
A careful reader will not fail to notice some strange discre- 
pancies in the preceding experimental results. Thus it will 
strike him as peculiar that 3 cwts. of dissolved bone-ash yielded 
24 tons of roots, whilst 7 cwts. of the same manure gave only 
about 1 ton more, and 10 cwts. only 10^^ cwts. more per acre. 
5 cwts. of dissolved bone-ash, on the other hand, gave 26 tons 
15 cwts. 1 qr. 12 lbs. 5 cwts. thus appear to have produced a 
heavier crop than 10 cwts. of the same manure. 
I do not pretend to explain these discrepancies, but have no 
doubt the experiments were carefully made, and can only say 
that, for some reason or the other Avhich often escapes our notice, 
some strangely anomalous results are sometimes obtained in 
field-experiments. The chief practical lessons which may be 
derived from these experiments appear to me to be — 
1. That sulphate of ammonia had little effect upon turnips, 
even when applied to a light, sandy loam. 
2. That the addition of sulphate of ammonia to superphos- 
phate seemed to have had no decidedly beneficial effect on the 
crop. 
3. That 5 cwts. of good superphosphate appear to be a suffi- 
cient dressing for roots on rich, light land, and consequently that 
it is a waste of money to apply such dressings as 8 or 10 cwts. 
