for Twenty Years in succession on the same Land. 113 
Table VIII. — Quantity and Quality of Barley on Selected Plots. 
Seventh Season, 1858. 
PROUUCE PER ACRE, &c. 
JHot8. 
M.vNURKs, I'ER Acri:. 
Dressed Corn. 
Total 
Coin. 
Straw 
and 
• Chaff. 
Total 
Produce 
(Corn and 
Straw). 
lbs. 
G635 
2424 
3590 
350C 
G192 
7160 
7082 
Corn 
to 
100 
Straw. 
Quantity. 
Weight 
per Itusti. 
7 
i O 
< 0 
1 A 
4 A 
4 A A 
4C 
14 Tons Farm-yard Manure 
Mixed Mineral Manure 
200 lbs. Ammonia-salts 
Mixed Mineral Manure, andj 
200 lbs. Ammonia-salts .. / 
Mixed Mineral Manure, and"! 
200 lbs. (') Ammonia-salts) 
Mixed Mineral Manure, andl 
1000 lbs. Rape-caiie ../ 
Bushels. 
55 
2n 
31J 
51J 
56i 
3< 5 
lbs. 
."54 -5 
53- 0 
54- 0 
53- 0 
54- 0 
53-5 
53-1 
lbs. 
3118 
1207 
1780 
1771 
2897 
3155 
31G2 
Cwts. 
315 
105 
IGJ 
15i 
29^ 
35f 
35 
88-7 
99-1 
98-3 
102 1 
87-9 
78-8 
80-7 
,Q) 400 lbs. the first G years (1852-7). (2) 2000 lbs. the first 6 years (1852-7). 
400 lbs. ammonia-salts, and the same with 2000 lbs. of rape-cake 
per acre. The crops manured with 400 lbs. ammonia-salts, and 
2000 lbs. of rape-cake, were, however, always obviously too 
heavy to stand up and ripen well in other than most exceptional 
seasons. For the crop of 1858, therefore, and subsequently, the 
quantity of rape-cake was reduced from 2000 to 1000 lbs. per 
<icre. The quantity of ammonia-salts applied to the "A A" 
pftjts was, at the same time, reduced from 400 to 200 lbs. per 
^acre ; and this dressing was continued for ten years, namely, to 
1867 inclusive, after which the 200 lbs. of ammonia-salts was 
substituted by 275 lbs. of nitrate of soda, which is estimated to 
contain the same quantity of nitrogen. From this time, there- 
fore — 1858 and afterwards — any increase of produce on plot 
4 A A, over that on plot 4 A, (with only 200 lbs. of ammonia- 
salts per acre from the commencement), is, doubtless, in great 
measure, due to an unexhausted residue of nitrogen supplied in 
the 400 lbs. of ammonia-salts used annually during the preceding 
six years ; and it will afterwards be seen that there was a marked 
effect from the previous excessive manuring, at any rate over ten 
consecutive seasons. In like manner, the produce on the plot 
manured with mineral manure and 1000 lbs, rape-cake in this 
and subsequent seasons, will be affected by the unexhausted residue 
Irom the excessive supply in the first six years. 
The seed was sown on March 20 ; the earlier plots were cut 
on August 4, and the later ones on August 17. Thus, with a 
rather limited, but still a sufficient, supply of rain for the require- 
ments of growth, and a comparatively hot summer and harvest 
period, the crops ripened somewhat early. There was, under 
VOL. IX.— s. S. I 
