262 Report on Experiments conducted in 1886 
manure, the duplicate plots agreeing well with one another,. 
The principal features shown at Whitlingham were, that dung 
alone gave no increase over the unmanured plots, but that dung^ 
and superphosphate mixed did so, viz. 3 tons per acre. With 
superphosphate alone a reduced yield was obtained, though when 
mixed with ^ cwt. per acre of bone- flour, an increase of 5 tons 
per acre was got. This raises the question whether the super- 
phosphate, by reason of its acidity, proved injurious to the land, 
which was poor in lime, and whether the neutralisation of the 
free acid by the bone-flour prevented this injury. The report 
of the Norfolk Chamber inclines to this opinion, but as against 
it plot 3 must be mentioned, in which superphosphate mixed 
with IJ cwt. nitrate of soda produced a yet higher result, as 
also plot 9 (superphosphate with sulphate of ammonia). In 
these no harm was done by the superphosphate. It may be the 
case that superphosphate should be neutralised before being 
used on such a soil, but the evidence is by no means clear, and 
only appears when superphosphate is used alone. Ground copro- 
lites did no good at all ; and as for potash — found so useful in 
the barley experiments — there was not only no increase, but its 
use was seemingly attended with loss. Between sulphate of 
ammonia and nitrate of soda there was little to choose. On 
the whole, these two last named, in conjunction with super- 
phosphate, proved about the best manures for swedes. 
(2) At Flitcham there was considerable difference between 
the duplicate unmanured plots. Superphosphate was used here 
unmixed with bone-flour, the land being so chalky, and it gave 
a certain, but not large increase. Nitrogen added to it increased 
the yield, and, contrary to the results at Whitlingham, potash 
(as sulphate) applied in addition gave a yet further increase. 
Plot 18 would indicate that a lesser amount than 2 cwt. of 
sulphate of potash per acre would suffice, though plot 14 is not 
quite in harmony with this. Ground coprolites here, too, have 
done no good. 
(3) At Aylsham the duplicate unmanured plots agree well, 
and while there is a small gain with ground coprolites, that 
with superphosphate used alone amounts to 3^ tons per acre, and 
when bone-flour is mixed with the latter, to still more. Nitro- 
genous manures added to superphosphate gave a less increase 
than in the case of Whitlingham and Flitcham, and to the 
addition of potash a small benefit only accrued. 
F. ExrEEIMENTS ON MANGOLDS (WhITLINGHAM). 
This scheme was also the one issued by the Royal Agricul- 
tural Society, so far as plots 1-5 and 7-11 were concerned, the 
other plots being added by the Norfolk Chamber of Agriculture. 
