for Twenty Years in succession on the same Land. 359 
1868, the first year of the sixth course, turnip-seed was sown twice, 
but entirely failed, owing to the dryness of the season ; and the 
land was then ploughed up, and left fallow for the barley. 
The result in regard to the turnips may be stated in general 
terms as follows : — 
fVithout manure there was scarcely any produce of turnips at 
all ; there was, therefore, no exhaustion of the land by the 
removal of the crop ; and it was, practically speaking, left 
fallow for the barley. 
With superphosphate of lime alone only small crops of turnips 
were grown, especially in the later courses ; still, much more was 
removed from the land than without manure ; and, as nothing 
was supplied besides what the superphosphate itself contained, 
the land was, so far as other constituents are concerned, left in a 
much more exhausted condition for the growth of the barley 
than without any manure whatever. 
fVith the mixed manure fair crops of turnips were removed in 
the earlier, but less in the later courses ; and (excepting in the 
first year) there would remain in the land a considerable residue 
from the manures applied, and hence it would be left in a 
tiigher condition for the barley than after either the unmanured 
or the superphosphated turnips. 
The produce of barley, under each of the three conditions as 
to manuring for the turnips, in each of the six successive 
•courses, and on the average of the six courses, is given in Table 
XLIX. (p. 360) ; and, for comparison, there is also given, in 
the top line of each division, the produce, without manure, 
in the same seasons, in the field in which barley is grown year 
after year on the same land. 
It will not be necessary to go into any detail respecting the 
produce of the individual years any further than to notice 
the apparently anomalous results of the first year. The much 
higher produce of barley after the unmanured than after the 
mixed-manured turnips, may be partly owing to some irre- 
gularities in the condition of the land at the commencement ; 
but it is, doubtless, chiefly due to the fact that there had been 
removed from the unmanured plot only about 3^ tons of roots, 
and 2^ tons of tops, and from the mixed-manured plot nearly 
11 tons of roots, and more than 7 J tons of tops; whilst, as the 
foot-note at p. 358 will show, the mixed manure was much less 
liberal for the first than for the subsequent courses. There was, 
in fact, not only very much more turnips removed from the 
manured than from the unmanured plot, but there would be 
much less residue of manurial constituents, if any, left for the 
barley of the first course, than for that of either of the subse- 
quent courses. 
