T/iorovffh- Draining and Subsoil-Ploiujldng . \77 
Experiment. Barley 1812 (following Tuvnljjs 1811.) 
Nos. 1, 2, 3, and 4, eacli containing one acre. 
<« 
Doscriiition of 
cn 1> 
3 u 
Manure. 
When 
When cut 
Wei^'ht of Straw 
p 
Observations. 
. <H 
o o 
sown. 
and carried. 
and Cliall". 
3 S 
a 
a 
T. C. Qr. Lbs 
1. Poittevin & Co.'s 
(25 Aug.-) 
i a Sept. j 
(lisiurocted . , 
2. Ludlow street- 
4i 
2j Ap. 
1 8 2 27 
42 
2i 
44} 
scaven^ering 
3. Boucs (lialf ineh) 
4i 
Do. 
Do. 
1 8 2 23 
40| 
2i 
431 
ti 
Do. 
Do. 
1 7 3 12 
40} 
2} 
431 
Some injury to 
the crop from 
an oak-tree. 
4- Fold-manure . 
Do. 
Do 
I 7 0 14 
40} 
3 
43i 
Do. do. do. 
The turnips of 1641 were one half carried olT for cattle, and the other half were eaten on tlie ground 
by sheep. 
XV. — On the Use and Application of Rape-dust. By John 
Hannam, North Deighton, Wetherby ; Honorary Member 
of the New York State Agricultural Society. 
[^Extractedfrom a Prize Essay of the Welhefhy Agricultural Society, " On the Applica- 
tion of Rape-dust and other Hand-tillayesy Longman and Co.] 
RAPE-clust, the seed of the rape plant after the oil has been ex- 
tracted from it, is a fertilizer of great value. It contains matters 
highly essential to the growth of vegetables. Thus, according to 
the analysis of M. Boussingault (' Annales de Chimie et de 
Physique/ September, 1841), 8 tons of rape-dust afford as much 
vitrogen as 100 tons of farm-yard manure. According to Dr. 
Madden,* it is greatly siqjerior to farm-yard manure in soluble 
organic f matter, equal to it in phosphates, and inferior to it 
slightly in saline matters ; or, taking all together, that 1 ton of 
rape-cake equals 18 42J; tons of farm -yard compost. 
From this analysis we should be justified in concluding, — 
1st. That rape-dust is a potent fertilizer ; for we have in the 
preceding pages shown that plants require a large portion of 
vegetable and animal matter to afford a supply of carbon, in the 
shape of carbonic acid, and of nitrogen, in the shape of ammonia ; 
* Prize Essays of the Highland Agricultural Society, June, 1842. 
t "The constituent parts of plants are of two distinct sorts, organic 
and inorganic. The organic parts are those which disappear by the 
action of tire. The inorganic constituents are left in the form of ashes." 
I My attention has been drawn to an error in this calculation, but I 
can state from observation that 1 ton of rape- dust is fully equal to 20 
tons of common dung. 
VOL. IV. N 
