Field Experiments on Root-Crops. 
3G9 
Pkoduck per Acre of Cleax Roots and Tors of Swedks obtained iu 
ExPEuiMicNTS made by IMu. G. Y. Wall, at the Lizards, near Sedce- 
FiEM), Ferry-Hill, County Durham. 
10 
11 
12 
Mancre. 
No Manure 
Mineral Superphosphate 
Mineral Superphosphate 
and 
Muriate of Potash 
Mineral Superphosphate 
and 
Peruvian Guano 
Peruvian Guano 
No Manure 
Mineral Superphospliate 
Muriate of Potash 
Sulphate of Ammonia 
Rotten Dung 
Mineral Superphosphate 
Muriate of Potash 
and 
Nitrate of Soda .. .. 
Rotten Dung 
and 
Mineral Superphosphate 
Bone-dust 
Mineral Superphosphate 
No Manure 
Weight of 
Manure 
per Acre. 
Produce per Acre. 
Koots. 
Tops. 
cwts. 
tons. cwts. 
lbs. 
tons. cwts. 
Ihs. 
10 
67 
2 
67 
3 
15 
1 
105 
2 
16 
56 
3 
15 
15 
99 
2 
19 
83 
2 
3 
Id 
28 
42 
1 
3 
19 
14 
71 
3 
10 
56 
10 
16 
98 
2 
8 
4 
I 
1 
17 
15 
Ob 
2 
13 
28 
tons 
20 
19 
9 
42 
3 
19 
1 
cwts. 
I 
t 
18 
8 
3 
7 
56 
tons 
10 
cwt. 
16 
10 
2 
2 
19 
98 
1| 
3 1 
14 
13 
14 
2 
10 
42 
10 
12 
36 
2 
6 
70 
In most of the experiments which I have set on foot of late 
years, I have suggested to leave three plots unmanured. One plot 
at each end of the experimental field, and one in the centre, 
it will be seen, received no manure of any kind in the case 
before us. 
The produce of the three unmanured plots calculated per acre 
was — on 
tons. cwts. lbs. 
Ivo. 1 10 11 67 
„ 6 10 16 98 
„ 12 10 12 36 
or the average produce of these three plots amounted to 10 tons 
13 cwts. 67 lbs. It appears from these results that the field on 
which the experiments were made was uniform in character, and 
throughout in the same agricultural condition. On comparing 
the average weight of roots on plots Nos. 1, 6, and 12, with the 
produce of each manured plot, we obtain the following increase 
as due to the fertilizers used. 
