368 
Field Expei-iments on Eoot-Crops. 
Name of Manure. 
No Manure 
Mineral Superphosphate 
Mineral Superphosphate 
and 
Muriate of Potash .. 
Mineral Superphosphate 
and 
Peruvian Guano .. 
Peruvian Guano 
No Manure 
Mineral Superphosphate 
Muriate of Potash .. 
and 
Sulphate of Ammouia .. 
Rotten Dung 
Mineral Superphosphate 
Muriate of Potash 
and 
Nitrate of Soda .. .. 
Rotten Dung 
and 
Mineral Superphosphate 
Bone Dust 
and 
Mineral Superphosphate 
No Manure 
Quantity of 
Manure 
per Plot. 
lbs. 
cwts. 
1 
Ib^ 
Til 
0 
0 
5f 
1 
1 UJ 
3 
111 
~ 
I 
tons. 
1 
20 
lbs. 
cwts. 
ICi 
3 
Hi 
2 
5f 
1 
cwts. 
tons. 
10 
10 
lbs. 
cwt>. 
H 
H- 
16* 
3 
H 
The manures were sown by hand, and green-top swede-seed 
drilled in on the 27th of May, 1869, the delay having been caused, 
by the continuance of dry weather. 
The season was not very favourable for root-crops ; however, 
a good plant was obtained, and a fair crop, considering the 
season, was grown upon the unmanured land. 
The swedes were harvested on the 1st of November, and the 
tops and bulbs weighed separately, when the results given on 
the following page were obtained. 
In this series of experiments mineral superphosphate was used 
alone, and in conjunction with potash-salts, as also in combination 
with potash and sulphate of ammonia, and with potash and 
nitrate of soda. 
An opportunity was thus given to ascertain whether it is 
advisable to use for swedes a purely mineral superphosphate, or 
to mix it with salts of potash, or with both potash and ammonia- 
salts, and also whether sulphate of ammonia may be replaced in 
a root-manure with advantage by nitrate of soda. 
