Growth of Turnips at Rusper, Horsham. 121 
Subtracting the mean yield of the totally unmanured plots 
from those of the various manured plots, we get the following 
increase, apparently due to the manures used for the turnip- 
crop. I say " apparently " advisedly, for there are discrepancies 
between some of the duplicate plots, which render it impossible 
to draw unqualified inferences from the mean figures : — 
Increase of Oats per acre on I\Ianured Plots over and above the Mean 
Produce of Unmanured Plots. 
Per acre. Bush, pecks, galls. 
10 tons cUmg 7 1 
10 tons dung and 5 cwts. superphosphate .. 3 3 0 
10 tons dung and 6j cwts. ground coprolites .. 7 3 1 
5 cwts. superphosphate oiily 4 1 Oj 
5 cwts. ground coprolites only G 3 0 
It is to be remembered that all the turnips were carted off, and 
not consumed on the field, so that the oat-crop was absolutely 
unmanured, save for the residues of the manures applied in the 
spring of the preceding year, and was therefore not grown as in 
ordinary good farming practice. It is striking that far from 
the worst of the oat-plots was plot No. 9 — a totally unmanured 
plot— which during the previous year produced turnips at the 
rate of only 2 tons 13 cwt. per acre. The other unmanured plot 
(No. 10), which yielded at the rate of 11 cwt. less turnips per 
acre than No. 9, gave also 16 bushels per acre less of oats than 
the latter. 
In order to test how far the scarcity of carbonate of lime in 
the soil might be responsible lor the superior efficacy of the 
ground coprolites, as compared with superphosphate, on the 
turnips of the preceding year, Mr. Parbury kindly undertook 
a fresh series of turnip experiments in a field on another part of 
the farm. 
The two acres chosen for this purpose were in the middle of 
a field, the recent history of which was as follows: — 1878—9, 
winter oats (no manure) ; 1880, bare fallow, 18 loads dung, 
for winter wheat ; 1881, white wheat, no further manure ; 
1882, oats. No manure, therefore, had been applied since the 
autumn of 1880, and the land was in very low condition. It 
was ploughed up in October 1882, and " cultivated," rolled, and 
harrowed, in April 1883. 
Various portions of the two acres of soil were sampled for 
analysis as shown on page 122. 
It will be seen that the soil has a chemical composition, on 
the whole very much resembling that of the field chosen for the 
previous trials. Its mechanical texture — a stiff clay — was also 
similar, but there was in the new field somewhat more lime 
than in the old one, though very little of this lime was in the 
