304 
MESSRS. J. B. LAWES AND J. H. GILBERT ON THE RESULTS OF 
with the nitrate commenced two years later than most of the others ; and that on 
plot 15 ended in 1875 ; whilst that on plot 17, like that on plot 5 with the ammonia- 
salts, has been continued up to the present time. The average produce of hay, &c., 
cannot, therefore, be taken over precisely the same, or as many years, with the nitrate 
as with the ammonia-salts. 
The following table shows the average results obtained over the first 8, the next 
10, and the total period of 18 years, of the application of the nitrate on plot 15 ; also 
those obtained, over the same periods, on plot 17, with only half the quantity of nitrate. 
For comparison, there are also given the results yielded, over the same periods, on plot 3 
without manure, and on nlot 5 with the ammonia-salts. 
Table IV.—Average, per acre per annum, by 550 lbs. and 275 lbs. Nitrate of 
Soda alone ; Plots 15 and 17. 
Average per acre per annum. 
Flot 3. 
Without 
manure. 
Plot 5. 
400 lbs. 
ammonia- 
salts. 
Plot 15. 
550 lbs. 
nitrate 
soda. 
Plot 17. 
275 lbs. 
nitrate 
soda. 
Plot 15. 
Plot 17. 
+ or — 
plot 3. 
+ or — 
plot 5. 
+ or— + or — 
plot 3. plot 5. 
+ or — | 
plot 15. 
Hat. 
First period, 8 years, 1858-1865 • • • 
Second period, 10 years, 1866-1875 . . 
Total period, 18 years, 1858-1875 . . 
Second period, per cent. + or —first period 
lbs. 
2492 
2236 
2350 
lbs. 
3300 
2471 
2839 
lbs. 
4038 
3913 
3968 
lbs. 
3837 
3755 
3792 
lbs. 
+ 1546 
+ 1677 
+ 1618 
lbs. 
+ 738 
+ 1442 
+ 1129 
lbs. 
+ 1345 
+ 1519 
+ 1442 
lbs. 
+ 537 
+ 1284 
+ 953 
lbs. 
-201 ! 
-158 
-176 
-10-3 
-25-1 
-3-1 
-21 
' 
Nitrogen. 
First period, 8 years, 1858-1865 . . . 
Second period. 10 years, 1866-1875 . . 
Total period, 18 years, 1858-1875 . . 
Second period, percent. + or —first period 
33-9 
30-9 
32 2 
57-2 
47-3 
51-7 
63-1 
61- 5 
62- 2 
55-5 
53- 2 
54- 2 
+ 29'2 
+ 30-6 
+ 30-0 
+ 5-9 
+ 14-2 
+ 10-5 
+ 21-6 
+ 223 
+ 22-0 
-1-7 
+ 5-9 
+ 2'5 
-7-6 
-8-3 
-SO 
-8-9 
-17-3 
— 2*5 
-4-1 
Mineral Matter (Ash). 
First period, 8 years, 1858-1865 . '. . 
Second period, 10 years, 1866-1875 . . 
Total period, is years, 1858-1875 . . 
Second period, percent. + or —first period 
145-8 
126-1 
134 9 
168-2 
108-9 
! 1353 
225-9 
205-4 
214-5 
223-8 
205-0 
213-3 
+ 80-1 
+ 79-3 
+ 796 
+ 57"7 
+ 96'5 
+ 79-2 
+ 78-0 
+ 78-9 
+ 7 8-4 
+ 55'6 
+ 96-1 
+ 7S-0 
-2-1 
-0-4 
—1-2 
-13-5 
— 35 3 
-9-1 
-8-4 
As the experiments with the nitrate commenced two years later than those without 
manure and those with ammonia-salts, the results are, so far, not strictly comparable; 
but a careful consideration of them shows that, if the exact figures cannot, the main 
indications can, without doubt, be thoroughly relied upon. 
