and Permanent Panture. 
91 
Table showinp; the Manures used, and the Weight of Green Produce from 11 
Plots of 55 of an Acre of Clover-seeds, at St. Agnes, Itedruth, and Produce 
calculated per Acre. 
Plots. 
Aliiimrc's iist i,!. 
Quiintily 
of Mamiie 
per .^n of an 
Acre. 
Proline* 
per or 
Acre. 
an 
Produce per Acre. 
11>S. 
cwts) 
qrs. 
lbs. 
Tons. cwts. lbs. 
1 
Nitrate of Soda 
22] 
6 
2 
11 
6 
11 
108 
2 
Sulphate of Ammonia .. 
6 
2 
25 
6 
15 
52 
3 
Mineral Superphosphate 
22 i 
6 
2 
15 
6 
12 
76 
4 
22i 
5 
3 
2 
5 
15 
40 
5 
5 
2 
10 
5 
11 
88 
6 
Muriate of Potash . . 
22.J 
G 
1 
12 
6 
7 
16 
7 
Sulphate of Potash 
6 
0 
8 
6 
1 
43 
8 
Sulphate of Lime .. 
56 
5 
3 
11 
5 
16 
108 
(Mineral Superphosphate 
22i 
9 
< and 
! 
8 
2 
27 
8 
U 
92 
(Nitrate of Soda .. .. 
22i 
Mineral Superphosphate 
22. 
10 
< and 
8 
0 
23 
8 
4 
12 
(Muriate of Potash.. 
22* 
11 
5 
2 
20 
5 
13 
64 
It will be seen that in the preceding experiments common salt 
and sulphate of lime produced no effect. 
Mineral superphosphate alone materially encouraged the 
growth of the clovers, and nitrate of soda and sulphate of am- 
monia that of Italian rye-grass. 
It is remarkable, however, that neither nitrate of soda nor 
sulphate of ammonia gave a better result than mineral super- 
phosphate alone. Taking no account of the small differences in 
the weight of the produce of the first three plots, we may say that 
all three gave the same weight of clover-seeds. But when super- 
phosphate was added to the nitrate of soda, the produce of 
Plot 1 rose from 6 tons 12 cwts. (in round numbers) to 8 tons 
15 cwts. : that is to say. Plot 10, manured with a mixture of 
superphosphate and nitrate of soda, gave an increase of 2 tons 
3 cwts. of clover-seeds over and above the yield of the plot 
manured with nitrate of soda only. Very nearly the same in- 
crease was obtained when superphosphate was added to muriate 
of potash ; and, in conformity with other experiments, the pro- 
duce was of a much inferior character on Plot 10 than on Plot 9, 
upon which nitrate of soda was employed. 
Both muriate and sulphate of potash increased the crop by 
nearly 1 ton, showing that potash-salts are more efficacious 
fertilising matters than soda-salts, — at least, on soils which like 
the soil of the experimental field was deficient in potash. 
On the whole, the preceding experiments furnish conclusive 
evidence of the deficiency of available potash-compounds and 
phosphates in the soil of the experimental field, and that it is 
not desirable to top-dress such soils with nitrate of soda. 
