Field Experiments on Swedish Turnips. 321 
light land, and for this purpose the Lansome-field, the only one 
which was available and at all suitable, was selected. In this 
field the varieties of wheat which were entered for the Society's 
prize-wheat competition were grown in the preceding year. 
The soil in this field is a light and deep sandy soil, containing 
but little lime and alumina, and a good deal of oxide of iron, 
especially in the subsoil. 
Neither was the field as level nor as uniform in its general 
character as I could have wished. Taking the most level por- 
tion of the field towards the centre, 4 acres, exclusive of the 
pathway between each plot, were set aside for experimental 
purposes. 
The land was very foul when it was taken in hand ; but by 
dint of much labour in forking out couch-grass and killing 
surface-weeds, it was got quite clean, and there was an excellent 
seed-bed for the turnips when the seed was drilled in. 
Each experimental plot occupied the space of a quarter of an 
acre, separated from the next by a path of 2J feet in width, 
and there were altogether 16 quarter-acre plots. 
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. 
Mamures Used. 
Quantity of 
Manure 
Cost of 
Manure per 
Cost of Manure per 
Acre. 
per Acre. 
Ton. 
£ «. 
£ s. d. 
1 
2 
Finely ground coprolites .. 
5 cwts. 
4"o 
10 0 
5 cwts. 
4 0 
10 0 
i 4 
|Redonda phosphate (phosphate'l 
\ of alumina and iron) . . . . / 
5 cwta. 
3 10 
0 17 G 
5 
Precipitated phosphate of lime . . 
4 cwts. 
5 0 
10 0 
«; 
Bone-meal (made from raw bones) 
3 cwts. 
7 10 
12 6 
7 
3 cwts. 
6 10 
0 19 6 
8 
3 cwts. 
4 0 
12s. Od.\ 43 3 , 
3I«. 3d.j 
\ and Peruvian guano 
2^ cwts. 
12 10 
These experiments were made in duplicate. 
It will be seen that in this scheme we have two kinds of 
finely ground phosphates, namely, ground coprolites, consisting 
mainly of phosphate of lime and some carbonate of lime ; and 
Redonda phosphate, a mineral phosphate, consisting for the 
greater part of hydrated phosphate of alumina, with some phos- 
phate of iron. 
Both were reduced to an impalpable powder. 
VOL. XVIII. — S. S. Y 
