280 Report of Experiments on the Growth of Barley, 
agricultural sense, corresponding crops of wheat and barley, 
require very nearly identical amounts of the different constituents 
to be available within the soil. These results show, experi- 
mentally, how nearly equal are the amounts of gross produce of 
the two crops, which a soil in a given condition will yield ; and 
it seems probable that the only difference will be that which is 
due to varying adaptation of season, and to the greater or less 
root-range of the one crop or the other. 
Average Annual Produce by Farmyard Manure. 
Table XXVII. shows the average annual produce of barley, 
and the increase over the mean produce without manure, by an 
annual dressing of 14 tons of farmyard manure per acre. 
Table XXVII. — Average Annual Produce, and Increase of Barley by Farmyard Manure 
(Plot 7.) 
AvEEAGE Annual PaoDncE, &c. j 
Ikcrease over (or under 
Ukmanured (Plots 1 0 and 6- 
First 
10 Years, 
1852-'61. 
Second 
10 Years, 
1862-'71. 
Total 
Period, 
20 Years, 
1852-'71. 
Second 
10 Years 
over 
(or under — ) 
First 
10 Y'ears. 
First 
10 Years, 
1852-'61. 
Second 
10 Years, 
1862-'71. 
Total 
Period 
20 Yeai 
1852-'1 
bushels 
45 
51i- 
481 
Per Cent. 
14-4 
21J 
33i 
27i 
lbs. 
2541 
2995 
2763 
17-9 
1193 
1967 
1580 
straw (and Chaff) per acre . . . . 
cwts. 
29| 
28i 
12-2 ' 
121 
19J 
Total Produce (Corn, Straw,&c.) per acre lbs. 
5525 
6342 
5933 
14-3 i 
2640 
4141 
339n 
Weight per Bushel of Dressed Corn 
lbs. 
52-6 
56-0 
51-3 
6-5 
1-0 
2-7 
1-9 
85-6 
91-3 
88-5 
6-7 i 
-2-3 
3-0 
0-4 
Unlike the produce without manure, that by farmyard manure 
was, in every particular of quantity, as well as quality, con- 
siderably higher over the second than over the first 10 years. 
Taking the average of the first 10 years, the produce of corn 
was exceeded by several, and that of straw by more, of the arti- 
ficial manures ; but, over the second 10 years, it was in no case 
exceeded in average amount of corn, and in only one case in 
amount of straw. Averaged over the whole period of 20 years, 
however, several of the mixtures of mineral and nitrogenous 
manure approached, and some even surpassed, it in produce of 
corn, more did so in straw, and several in total produce (corn 
and straw together). 
The individual years in which the dunged plot, more or less, 
exceeded all others, were — in produce of corn, 1859, 1862, 1864, 
1865, 1866, 1867, and 1871 ; in produce of straw, 1862 and 
1 
