Experiments with different Top-Dressings upon Wlieut. 21 
Tlic've was not mucli clifTorpnce between tho appcaranco of this 
crop and that on Ph)t V. At an early stage of growth the crops 
on Ph)ts I., v., and VI. liad a less dark green colour in coin- 
])arison with the others, and especially with those that were 
top-dressed with nitrate of soda. The wheat stood perfectly 
erect at harvest-time. 
Plot VII. — Top-dressed March 27 with sulphate of ammonia, 
produced : — 
cwt. qrs. lbs. 
Com, Head 5 2 22 
„ Tail 0 0 H 
5 3 5 
Straw 9 0 9 
Cavings 0 0 20 
Chaff Oil 
Produce per acre : — 
Corn (head and tail) 44 bushels. 
Straw (including cavings and chaff) 1 ton 18 cwt. 8 lbs. 
The sulphate of ammonia was the ordinary commercial article, 
and on analysis was found to contain : — 
Moisture C'.'iO 
* Pure sulphate of ammonia 91'94 
Mineral impurities 1"47 
100-00 
'Containing ammonia 2.3'68 
Plot VIII. — Top-dressed with soot, produced : — 
cwt. qrs. lbs. 
Corn, Head 5 1 19 ' 
„ Tail 0 0 8 
3 1 27 
Straw 7 3 25 
Cavings 0 0 24 
Chaff 0 1 6 
Produce per acre : — 
Com (head and tail) 41 bushels 41 lbs. 
Straw (including cavings and chaff) 1 ton 13 cwt. 3 qrs. 24 lbs. 
The young wheat on this and on the preceding plot was not 
quite so dark-coloured as on Plots III. and IV., and not quite so 
strong as that dressed with Peruvian guano. No perceptible 
difference was visible on Plots VII. and VIII. 
An analysis of the soot furnished the following results : — 
