138 
Effects of cUfferent 3Ianurcs on the 
The most important practical points for consideration arc 
those which illustrate the character of the herbage in relation to 
the vianiires employed, and to the amounts of crop yielded. In 
relation to these points, therefore, we shall briefly consider — 
1. The general description, and proportion per cent., of the 
dilierent kinds of herbage (Graminaceous, Leguminous, or Mis- 
cellaneous), and the number of species. 
2. The description, and proportion per cent., of the predomi- 
nating species. 
3. The tendency to the development of leafy or stemmy pro- 
duce, and the order of ripeness. 
I. — The general description, and proportion per cent., of the 
different hinds of herharje (^Graminaceous, Leguminous, and 3Iis- 
cellaneous), and the number of species, in relation to t/ie manures 
employed, and to the amounts of crop y ielded. 
In Table II. (pp. 140-141), are given the results relating to this 
branch of the subject. On the left hand will be found a short 
description of the manures employed, and a column showing the 
average annua] yield of hay per acre on each plot, reckoned 
from the commencement of the experiments to 1862 inclusive ; 
the records for the plot giving the largest amount of produce 
standing at the head of the list, and so on, in order, according to 
the crop yielded. Side by side with these particulars, on their 
right, are given, for each plot, the proportion per cent, in the 
produce, of — 
1. — Graminaceous herbage : 
Determined species ; 
Undetermined stem and leaf; 
Shedded flowers, seeds, (Sec., chiefly Graminaceous. 
2. — Leguminous herbage. 
3. — Miscellaneous or weedy herbage. 
Also the number of species, respectively of the Graminaceous, 
the Leguminous, and the Miscellaneous herbage. 
It Avill be seen that the average annual amount of produce at 
the head of the list is 6877 lbs., and that there is a pretty gradual 
diminution down to 2720 lbs., which is the yield without manure 
of any kind. The heaviest produce was obtained where, in con- 
junction with the mixed mineral manure, the largest amount of 
ammonia-salts (containing about 164 lbs. of nitrogen) was ap- 
plied. Leaving out of consideration for the present the com- 
paratively immaterial influence of cut wheat-straw, or sawdust, 
the next in order as to amount of crop are the five plots where, 
with the mixed mineral manure, half the (juantity of nitrogen 
(about 82 lbs.), either in the form of aiiunoiiia-salts or nitrate of 
