Field Experiments on Root- Crops, 
383 
Plots. 
ICiud of IMaiiurc used. 
• 
Quantity of 
A'luiiurc 
per I'lut. 
Qunntity of 
Aluuuro 
IKV Acre. 
No Manure . . 
lbs. 
cwts. 
1 
• * 
2 
16J 
3 
« i 
3 
and 
i 
Muriate of Potasli 
lit 
2 
( 
IMineral Superpliospliatc 
3 
aud 
\ 
I 
5 
16| 
3 
6 
.. 
16^ 
3 
and 
Hi 
2 
1 
and 
1 
ton 
tons 
8 
1 
20 
lbs. 
r 
16^ 
3 
1 
and 
9 1 
Hi 
2 
and 
5^ 
1 
cwts, I 
tons. 
( 
10 
10 
10 j 
and 
lbs. 
cwt. 
Si 
16^ 
3 
"1 
and 
Si 
n 
12 
ments, they are not altogether void of interest. It will be noticed 
that, as in previous years, the addition of potash-salts to super- 
phosphate had a decidedly beneficial effect upon the crop. Thus, 
whilst 3 cwts. of superphosphate produced 17 tons of mangolds, 
the same quantity of superphosphate, used with 2 cwts. of muriate 
of potash, yielded 19 tons 15 cwts., or 2 tons 15 cwts. more than 
superphosphate alone. It will likewise be noticed that the arti- 
ficial manures which were applied to plot No. 3 (superphosphate 
and potash-salts), and to plot No. 7 (superphosphate, muriate of 
potash, and sulphate of ammonia), had quite as good an effect as 
a heavy dressing of good rotten dung ; and, lastly, it will be seen 
that in these experiments the addition of sulphate of ammonia to 
supei'phosphate and muriate of potash had a better effect than 
the addition of nitrate of soda to the same fertilizers. 
