152 Field Experiments on Mangolds. 
Mesults of Experiments on Mangolds at Iver Moor, near TJxhridge, 
Plots of 
55 Of 
au acre, 
Manure per Acre. 
Produce per Plot of 
^ of an Acre- 
Produce per 
Acre. 
Tons. 
cwts. 
lbs. 
Tons. 
CWt^. 
lbs. 
1 
No Manure 
1 
1 
84 
21 
15 
0 
2 
Mineral Superphosphate 3cwts. .. 
1 
3 
5G 
23 
10 
0 
(Mineral Superphosphate Sewts.- •) 
3 
< and \ 
1 
5 
0 
25 
0 
0 
(Potash salts .. .. 2cwts. ..) 
(Mineral Superphosphate 3 cwts. .. 1 
4 
< and > 
1 
5 
50 
25 
10 
0 
[Peruvian Guano .. 1 cwt. ..) 
5 
Peruvian Guano .. Scwts. .. 
1 
8 
0 
28 
0 
c 
G 
1 
3 
0 
23 
0 
0- 
/Mineral Superphosphate Scwts. 
and 1 
7 
1 
10 
GO 
30 
10 
80 
1 and 
ISuIphate of Ammonia ..Icwt. ..J 
8 
i 
i 
97 
Q 
0 
/Mineral Superphosphate 3 cwts. .. j 
1 and 1 
9 
1 
10 
0 
30 
0 
0 
INitrate of Soda .. ..Icwt. ..) 
10 
< and > 
1 
6 
0 
26 
0 
0 
I Mineral Superphosphate \h cwt. . . ) 
11 
< and > 
1 
4 
0 
24 
0 
0 
(Mineral Superphosphate Ijcwt. ) 
1 
The rest of the field (5 acres) was manured with 5 cwts. of 
Proctor and Rjland's mangold-wurzel manure, and yielded on an 
average 28 tons of mangolds per acre. On looking over the 
results of the preceding experiments, several points are likely to 
arrest the reader's attention : — 
1. The land, although light, appears to have been in a good 
agricultural condition ; for the unmanured plots yielded at the 
rate of 21 tons 15 cwts., and 23 tons, or on an average 22 tons 
7J cwts. of mangolds ; or, in round numbers, 22 tons. 
2. Mineral superphosphate applied at the rate of 3 cwts. per 
acre gave but the slight increase of 1 ton 2 J cwts. over the 
average yield of the two unmanured plots. 
3. The addition of 2 cwts. of potash salts to 3 cwts. of super- 
phosphate had a good effect ; for it produced an increase of 
nearly 3 tons, or nearly 2 tons more than mineral superphosphate 
alone. 
4. The mixture of 3 cwts. of mineral superphosphate and 
