Field Experiments on Swedish Turnips. 
95 
suitable in the series of experiments which I devised, with tlie 
primary object in view of obtaining information upon the com- 
parative fertilising^ effects of finely ground and of soluble phos- 
phatic manures, I thought it might be interesting, from a purely 
economical point of view, to test the effects of a guano and 
superphosphate mixture, costing less than one-half of the expense 
of a dressing of 20 tons of dung ; and accordingly I preserved 
two plots for trial with guano and superphosphate. 
The dung was applied to the land in a rotten state, between 
the 13th and the 15th of May, and the artificial manures on 
the 10th of May, 1880. 
The swedes (Gibbs Selected) were sown on the 24th of May, 
in rows 22 inches apart. 
The following table shows the way in which the several 
quarter-acre plots were treated as regards manure, the cost of 
each kind of manure per ton, and the cost of the application 
per acre. 
Plots. 
Makdres Used. 
Quantity of 
Manure 
per Acre. 
Cost of 
Manure per 
Ton. 
Cost of Manure per 
Acre. 
£ s. 
s. d. 
1 
Finely ground cnprolites .. 
6J cwts. 
3 10 
22 9 
2 
5 cwts. 
4 10 
22 6 
3 
Fiuely ground Redonda phosphate 
10 cwts. 
2 2 
21 0 
4 
3J cwts. 
6 10 
22 9 
5 
Precipitated phosphate 
4^ cwts. 
5 0 
22 6 
6 
7 
3 cwts. 
7 10 
22' 6 
8 
20 tons. 
9 
1 and dissolved eoprolites 
10 tons. 
5 cwts. 
10 
20 tons. 
1 and finely ground eoprolites .. 
6| cwts. 
11 
Chalk 
5 tons. 
About 5s. 
25 0 
12 
8 cwts. 
4 10 
13s. U.\ 4 9^ 
31s. 3d./ 
\ and Peruvian guano 
2^ cwts. 
12 10 
These experiments were made in duplicates. 
It will be seen that, with the exception of the manures applied 
to plot 12, the cost of the artificials per acre was very nearly 
the same in all cases in which artificial manures were used. 
The following sketch shows the arrangement of the 6-acre 
field :— 
