Report of Experiments on the Growth of Wheat. 
103 
The Field Results. 
In former numbers of tins Journal (vol. viiL part 1 ; vol. xii., 
part 1 ; and vol. xvi., part 2), the most important of the results 
obtained in the earlier years have been discussed ; and to those 
papers, and to the detailed records given in the Appendix Tables 
at the conclusion of this paper, the reader is referred for any 
more than the very brief notice of the experiments of the first 
eight years which can now be given. 
On the present occasion the results of the whole 20 years will 
be treated of under the following separate heads : — 
First. — Amount and character of the produce obtained under the 
different conditions of manuring, in each of the 20 years ; with 
brief reference to the characters of each season. 
Second. — Effects of the unexhausted residue from previous 
manuring (both nitrogenous and mineral) upon succeeding crops. 
Third. — Average annual result over the last 12 gears, bg each 
description of manure applied gear after gear on the same plot. 
Fourth. — Amount of ammonia in manure required to yield one 
bushel increase of grain (with its proportion of straio), according 
to the quantitg applied per acre, to the available supply of mineral 
constituents within the soil, and to the season. 
Fifth. — Concluding observations ; showing the practical bearings 
of the results. 
I. — Amount and Character of the Produce obtained in 
DIFFERENT SEASONS.* 
First Season, 1843-4. 
The winter of 1843-4 was unusually mild until the end of 
January. February and March were cold, Avet, and stormy. 
April and May were unusually dry, with some warm weather, 
but a good deal of cold easterly wind. June was variable as to 
temperature, with scarcely any rain throughout the greater part 
of it, but a good deal towards the end of the month. July was 
wet, but with more than . the average temperature, especially 
during the last week. August was almost throughout colder 
than usual, and excepting towards the end, windy and wet. 
In September a moderate amount of rain fell, but the weather 
was, upon the whole, warm and favourable. The dew-point and 
the degree of humidity of the air were, in June below, and in 
July about the average ; in August the dew-point was low, but 
with the prevailing low temperature the degree of humidity was 
high ; and in September both dew-point and degree of humidity 
were above the average. 
* The references to the characters of the seasons, and of the wheat-crops of 
the country, may be taken as applicable, so far as such brief and general state- 
ments can be, to a considerable portion of the Midland, Eastern, and Southern 
counties of England. 
