308 
MESSRS, J. B. LAWES AND J. H. GILBERT ON THE RESULTS OF 
300 lbs. sulphate of potass. 
100 lbs. sulphate of soda (200 lbs. the first 8 years). 
100 lbs. sulphate of magnesia. 
200 lbs. bone ash 
150 lbs. sulphuric acid, sp. gr. 17 
The following table shows the results obtained over the first 10, the second 10, and 
the total period of 20 years, 1856-75 inclusive, also, for comparison, those without 
manure over the same periods. 
} 
superphosphate of lime. 
Table V.—Average, per acre per annum, by Mixed Mineral Manure alone ; Plot 7. 
Average per acre per annum. 
Plot 3. 
Plot 7. 
Plot 7. 
+ or — plot 3. 
Without 
[ Mixed mineral 
manure. 
manure. 
Hat. 
lbs. 
lbs. 
lbs. 
First period, 10 years, 1856-1865 ....... 
2531 
3797 
+ 1266 
Second period, 10 years, 1866-1875 . 
2236 
4118 
+ 1882 
Total period, 20 years, 1856-1875 . 
2383 
3958 
+ 1575 
Second period, per cent. + or — first period . . . 
-11-7 
+ 
GO 
6i 
Nitrogen. 
First period, 10 years, 1856-1865 . 
351 
55-2 
+ 20-1 
Second period, 10 years, 1866-1875 . 
30-9 
58-0 
+ 27-1 
Total period, 20 years, 1856-1875 . 
33-0 
56-6 
+ 23-6 
Second period, per cent. + or — first period . . 
-12-0 
+ 5-1 
Mineral Matter (Ash). 
- First period, 10 years, 1856-1865 . 
148-5 ■ 
246-3 
+ 97-8 
Second period, 10 years, 1866-1875 . 
126-1 
261-6 
+135*5 
Total period, 20 years, 1856-1875 . 
137-3 
254-0 
+ 116-7 
Second period, per cent. + or — first period . 
-15-1 
+ 6-3 
Here then, with a mixed mineral manure alone, we have considerably higher amounts 
of produce than with nitrogenous manure alone applied as ammonia-salts, and, taking 
the whole period, nearly as much as when applied as nitrate of soda. Not only so, 
instead of a reduction in hay, in nitrogen, and in mineral matter, removed over the 
second compared with the first 10 years, there is an increase of all three over the 
second period. 
