302 Report of Experiments on the Groicth of Barley, 
during the first 6 years, it is not possible to determine. Further 
comments on the results at present would, therefore, be premature. 
It will be more instructive to compare the results obtained by 
the mixture of mineral and nitrogenous manure on wheat and on 
barley respectively. The first comparison will be between the 
effects of the same amounts of superphosphate of lime, and 
sulphates of potass, soda, and magnesia, and 200 lbs. of ammonia 
per acre per annum, for 20 consecutive seasons, with each crop. 
Table XXXVI. shows the result ; and as in other cases the pro- 
duce per acre, and not the increase, is taken for illustration. 
Tablk XXXVI. — Averacce Annual Produce of Wheat and of Barley by Mixed 
Mineral Manure, and 200 lbs. Ammonia-salts per Acre per Annum. 
Manures feu Acrr, per Annum: — 
3.5 cwts. Superphosphate of Lime. 
200 lbs. (1) Sulphate of Potass, 
ino lbs. (2) Sulphate of Soda. 
100 lbs. Sulphate of Magnesia. 
200 lbs. Ammonia-salts. 
Average ANiiUAi, Produce, &c. 
First 
1 0 Years, 
1852-'61. 
Second 
10 Years, 
1862-71. 
Total Period, 
20 Years, 
1852-71. 
Second 
10 Years 
over 
(or under—) 
First 10. 
Total Corn, per Acre. 
Wheat (Plot 6), 20 years, 1852-1871 
Barley (Plot 4 A), 20 years, 1852-1871 
Barley over (or under — ) wheat 
lbs. 
1697 
2593 
lbs. 
1639 
2668 
lbs. 
1668 
2630 
Per Cent 
- 3-4 
2-9 
896 
1029 
962 
Straw (and Chaff), per Acre. 
Wheat (Plot 6), 20 years, 1852-1871 
Barley (Plot 4 A), 20 years, 1852-1871 
Barley over (or under — ) wheat 
2946 
3234 
2554 
3139 
2750 
3187 
-13-3 
- 2-9 
288 
585 
437 
Total Produce (Corn, Straw, and Chaff), per Acre. 
Wheat (Plot 6), 20 years, 1852-1871 
Barley (Plot 4 A), 20 years, 1852-1871 
Barley over (or under — ) wheat 
4643 
5827 
4193 
5808 
4418 
5817 
- 9-7 
- 0-3 
1184 
1615 
1399 
(') oOO lbs. the first 7 years of wheat, and 6 years of harley ; 200 lbs. afterwards. 
(^) 200 lbs. the first 7 years of wheat, and 6 years of barley ; 100 lbs. afterwards. 
For the period of 20 years included in the comparison, the 
manuring was, with a quite immaterial exception explained in 
the foot-notes, identical for the two crops. But whilst in the 
case of the barlev, the period commences with the first year of 
