Report, of Experiments on the Growth of Wheat. 
117 
As already explained, and indicated by the few comments made 
on the results, the arrangement of the manures of the first eight 
seasons was determined on each year with reference to certain 
individual points, regard being at the same time paid to the 
previous manuring and produce of the respective plots, and much 
more uniformity observed from year to year in the later years. 
From this time forward, it was sought to bring the whole of 
the plots still more strictly into comparison one with another, 
each year, and through a series of years, in order to trace, by the 
conjoint aid of the field-results and analysis, the relative excess, 
or'deficiency, of the available supply of the different constituents 
required by the crop, year by year, and through a long course of 
years. To this end, in the ninth and eleven succeeding years, 
the manure has been, with a few special exceptions, the same 
from year to year on the same plot. The only exceptions requiring 
notice here are, that the manures of Plots 17 and 18 are annually 
transposed, and that in the sixteenth and succeeding seasons some 
of the mineral manures were reduced in quantity per acre on all 
the plots where they had been previously applied. 
Appendix Table IX., p. 162, shows, in a tabular form, the 
manure applied to each plot, in each of the last 12 years of the 
experiments ; but it will be well to give a more explanatory 
statement of the description and arrangement of the manures in 
this place. In doing so the plots will not be enumerated in the 
same order as in the field, and in the Appendix Tables, but in 
such as will best indicate the points of comparison which it was 
sought to establish by the arrangement adopted. 
The plan, description, and quantities per acre per annum, for 
the 12 years (1852-63), were as follows : — 
Plot 2. — 14 tons farmyard manure (also for the eight preceding years). 
Plot 3. — Unmanured (also for the eight preceding years). 
Plot 20. — Unmanured (also for five preceding years), duplicate at the 
other side of the field. 
Plot 4. — Unmanured (sulphate of ammonia, and bone-ash acted upon 
by hydrochloric acid, for seven preceding years). 
Plot 0. — Superphosphate of lime alone ; composed of 600 lbs. bone-ash 
and 450 lbs. sulphuric acid, sp: gr: 1-7 (also for three preceding years). 
Plot 1. — Mixed alkalies ; composed of 600 lbs. sulphate of potass, 
400 lbs. sulphate of soda, and 200 lbs. sulphate of magnesia (also 
for three preceding seasons) ; reduced to 400, 200, and 200 lbs. 
respectively, in the sixteenth and succeeding seasons. 
Plots 5 (a and b). — Mixed mineral manure ; composed of — 
300 lbs. sulphate of potass. 
200 lbs. sulphate of soda. 
100 lbs. sulphate of magnesia. 
200 lbs. bone-ash ] , , , « ,. 
150 lbs. sulphuric acid, sp: gr. 1-7/ superphosphate of lime. 
