100 
Ploughing-in Green Crops. 
\i we can accept the result of tliis one rxperiincnt, it tends to 
show that the virtue of the manure left in the excreta of the 
sheep is about equal to what is expended on making mutton 
and wool besides maintaining the animal's heat and existence. 
If we take the 2 quarters of oats as a fair e(juivalent to the 
12 bushels of barley before mentioned, it follows that the entii'e 
manurial value of 18 tons of turnips ploughed-in is equivalent 
to 24 bushels of barley, or 32 of oats ; or if these are valued 
respectively at 32s. and 24a-. a quarter, is 4/, 16's. for 18 tons, or 
about 5.S-. per ton ; or 2s. G^Z. per ton for the excreta left by 
fattening sheep. 
Swede turnips, apart from their value as feed, are not well 
suited for ploughing-in as manure ; they do not rot down well, 
though they be smashed with mallets. The clodcrusher will 
not break them, and the tops will strike root and grow if any 
part of the crown of the bulb is left adhering to them. 
The results obtained by ploughing-in turnips in 1S42 induced 
me to try white mustard in 1843 on a small field of 8 acres ; 
soil a stiff, poor clay, upon blue lias clay subsoil, as foul with 
twitch as possible ; it was ploughed about 7 inches deep in the 
winter, then scarified with broadshares about 3 inches deep the 
last week in March, and after being well harrowed, sown with 
white mustard seed by a broadcast seed-barrow, at the rate of a 
bushel to 3 acres, covered in by very light seed harrows. This 
crop was just breaking into bloom the last Aveek in May, and 
2fi inches high, when it was ploughed-in about 4 inches deep, 
and lUU bushels of lime (after being slaked with salt and water) 
applied per acre ; then after one turn of the Norwegian harrow, 
re-sown with mustard, care being taken that all ploughed-in 
irit/nn f Jie day., should be re-sown on the same day it ivas ploughed ; 
all was finished on the last day of May. 
On the 8th of July, we began ploughing-in 6 inches deep this 
second crop, which was above 4G inches high ; about accomplish- 
ing this I had some misgivings at first, but managed it well by 
attaching a heavy block of wood, 12 inches wide, 18 inches long, 
drawn by a chain attached to the large whippletree, and dragged 
just under the plough beam, a few inches in advance of the 
coulter. This further served to regulate the depth instead of 
a wheel. We had also the usual drag weight and chain to lap 
the whole under the furrow. About six furrows at the last must 
be done with the horses at length, or else when the land horse 
returns on the same tract as he went, he ricks and entangles the 
long stems so together, that they lap round the coulter and 
choke the plough, causing much trouble, and making the work 
rough and untidy : by putting the horses " at length " there 
is no trouble, except with the last two furrows. Immediately 
