Analyses of the Mineral Ingredients of the Hop. 221 
of the land by the hop, is the main reason for the necessity o f 
manuring this plant so highly : — 
7. — Quantity of Guano, Farm-Yard Dung, or Wheat Straw, necessary to furnish 
the 17 lbs. of Potash taken from the Soil by the Acre of Faniham Hops. 
Hops, leaves, and bine of one 
acre of hops, containing 
500 lbs. hops, 
146^ lbs. leaves, 
289 lbs. bine. 
Guano. 
Wheat 
straw. 
Farm-yard 
dung. 
935^ lbs. 
7 cwt. 
23 cwt. 
61 cwt. 
It is evident, from the foresoin^ table, that though 2 cwt. of 
guano are amply suflBcient to supply the acre of hops with its phos- 
phates, yet that it requires 7 cwt. to supply the potash. Conse- 
quently the 5 cwt. of guano might have been replaced by a cheaper 
manure destitute of phosphates, but containing \ '2h lbs. of potash. 
Hitherto I have spoken as if the hops, leaves, and bine of the 
acre of Farnhams were of the usual or average weight. But this 
was not the case. Owing to the unkindly weather the yield was 
very deficient. It is no uncommon thing in some districts to grow 
a ton of hops an acre. We will suppose a farmer to grow a ton 
of hops per acre, and that the mineral ingredients of the hop are 
in the same proportion as in those which were analysed. 
We will suppose that the bine and leaves were double in quan- 
tity, but containing the same per cent, of inorganic matter as the 
others. This would give us 64 lbs. removed per acre by the 
Golding hop, while the Grape hop would remove about 75 lbs. 
per ton, though perhaps 64 lbs. might be taken as the average. 
The following table will then show us the weight of guano, 
wheat straw, or farm-yard dung, per acre, necessary to be put on 
the land, to replace the potash withdrawn by the hops, bine, and 
leaves : — 
8. yuANTiTY of Guano, Wheat Straw, or Farm- Yard Dung annually necessary to re- 
))lace the 64 lbs. of Potash taken from an Acre of Land by a Ton of Hops, with 
Bine and Leaver corresponding. 
Hops, leaves, and bine of an 
acre of hups, contaiuing 
2240 lbs. of hops, 
293 lbs. of leaves, 
578 lbs. of bine. 
Guano. 
Wheat 
straw. 
Farm-yard 
dung. 
3111 lbs. 
1 ton 5 cwt. 
4 tons 7 cwf. 
11 tons 13 cwt. 
Now as the whole of the above methods of furnishing the neces- 
sary amount of potash are enormously expensive, we are necessitated 
to look to other and cheaper sources for this valuable substance. 
