by Local Agriculhiral Societies. 
387 
given to the soil, it was determined to find how much of the unex- 
hausted residue of the dung left after the mangel crop was removed 
could be recovered in future crops. Three plots, accordingly, were 
carried through the entire four-course rotation. The total results 
obtained during the four years may be summai-ised as follows : — 
Results obtaIx\ed in 1886, 1887, 1888, and 1889. 
Plot 
Mauure used for mangel in 1886 
1886 
Mangel 
1887 
Barley 
1888 
Seeds 
(Green 
produce) 
1889 
Wheat 
1 
2 
6 
\ 2 cwt. nitrate of soda . ./ 
f 4 cwt. superphosphate, ni- 1 
\ trate of soda, and salt . . J 
tons 
23 
27 
25 
bushels 
43 
38i 
tons 
n 
8 
bushels 
33a 
33 
32i 
The soil is of a light and porous nature, and to this, doubtless, is 
due the apparently enormous loss of fertilising matter in the dung — 
matter containing probably as much nitrogen as would be found in 
12 cwt. of nitrate of soda, besides phosphates and potash. It is 
never well to allow too much emphasis to be laid upon the results 
of a single experiment, especially when the outcome is very unex- 
pected. It may be well to observe, however, that the soil of the 
three plots in question has all along given every indication 
of evenness of character, and that the utmost accuracy has been 
observed throughout the experiments, so that the record is a record 
of fact, whatever may be the explanation. 
These results find a parallel in the case of the Woburn experi- 
ments upon the residual values of manures, and seem to indicate 
that upon light lands any great amount of capital sunk in the soil 
in the form of a heavy dressing of farmyard manure applied at one 
single time is not likely to produce a return in future crops. 
Experiments ^qjon Barley (after Swedes carted off). 
In 1889 one series was carried out at Bolwick, but, the un- 
manured plots yielding very high returns, the influence of the 
manures was not clearly marked. One point is worthy of notice — 
that common salt had a weakening rather than a strengthening 
effect upon the straw, the com of the plots where it was used being 
more laid than on the others. 
In 1890 the experiment was repeated at Cawston, and a capital 
barley crop was reaped. 
The main results are recorded in the table on page 388, 
The unmanured produce was high ; superphosphate and muriate 
of potash — when without nitrogen — gave no increase ; but l}j cwt. 
of nitrate of soda gave the most economical results of all, both in 
grain and straw — 15 more bushels of corn being obtained, at a cost 
