Experiments upon Sv:cdcs. 
75 
sides of the expeiiinental plots, and the produce from these two 
additioiud plots was weiufhed when the produce of the 20 experi- 
mental plots was ascertained. 
On each ])lot of the experimental field a remarkably even and 
good plant was obtained. The season being- mild, the roots con- 
tinued to grow throughout November ; they were, thcrefoi'e, left 
in tlie field until the Hth of December, when the croj) was taken 
up. The I'oots were topped and tailed and cleaned, and tlu; 
whole produce of each plot then carefully weighed, with the fol- 
lowing results : — 
Table showing Produce per Acre of Swedes, topped and tailed and cleaned, 
and Increase per Acre over the Unmanured portion, in Field 7, lioyal 
Agricultural College Farm, Cirencester, 1859. 
Plot. 
Manure. 
Produce 
per Acre. 
Increase per Acre. 
tons 
cwts. qrs. 
lbs. 
tons. cwts. qrs. 
lbs. 
1 
15 tons of farmyard-manure 
18 
10 
2 
24 
3 
16 
1 
20 
2 
15 tons of fai inyard-manureancl 2 cwts. 1 
17 
6 
3 
4 
2 
12 
2 
0 
3 
3 cwts. of superphosphate 
17 
11 
2 
10 
2 
17 
1 
6 
4 
17 
6 
3 
4 
2 
12 
2 
0 
5 
6 cwts. of superphosphate 
21 
2 
3 
12 
6 
8 
2 
8 
6 
16 
14 
1 
4 
2 
0 
0 
0 
7 
2 cwts. of superphosphate and 1 cwt."l 
18 
11 
1 
20 
3 
17 
0 
16 
8 
17 
2 
20 
4 
3 
1 
16 
9 
1 cwt. of sulphate of ammonia .. 
\l 
17 
3 
12 
1 
3 
2 
8 
10 
14 
1 
4 
11 
1^ 
9 
2 
16 
3 
15 
1 
12 
12 
2 cwts. of sulphate of ammonia .. 
16 
17 
3 
12 
2 
3 
2 
8 
13 
20 
1 
1 
20 
5 
7 
0 
16 
14 
18 
9 
1 
4 
3 
15 
0 
0 
15 
20 
7 
0 
16 
5 
12 
3 
12 
16 
15 
16 
1 
0 
1 
1 
3 
24 
17 
3 cwts. of dissolved bone-ash 
20 
15 
2 
24 
6 
1 
1 
20 
18 
3 cwts. of dissolved bone-ash and 1 cwt."l 
20 
6 
3 
24 
5 
12 
2 
20 
19 
3 cwts. of sulphate of potash 
17 
0 
2 
4 
2 
6 
1 
0 
20 
3 cwts. of dissolved boue-ash and 1 cwt."l 
21 
0 
2 
4 
6 
6 
1 
0 
The two plots adjoining the experimental field yielded : — ■ 
J 
Manured with farmyard and super-) 
17 6 1 20 
2 12 0 16 
2 
Manured with farmyard and super-l 
17 18 0 24 
3 3 3 20 
In looking over the list oi Hhe different manures employed in 
these experiments, it will be noticed in the first place that cer- 
tain simple salts which commonly enter into the composition of 
artificial manures have been used separately. It is not likely 
