24G 
Repot t of Experiments with different Manures 
hay-crop was nearly 1^ cut. This amount is about one and 
■a-half times as much as was contained in either wheat or barley 
when unt?iaiiured. 
7. 13y means of mineral mamire ahme, or ammoniacal salts alone, 
tlie annual yield of mineral matter in the hay-crop was raised to 
about 2 cwts. per acre ; and by nnneral and nitrogenous manure 
■combined, to about 4 cwts. per acre. 
8. It is particularly in potash, that the hay-crop is more ex- 
liaustive of soil-constituents, than eitlier wheat or barley. 
9. Owing to the comparatively large amount of ?wi/;eraZ con- 
stituents taken from the land in the hay-crop — to the less regular 
return of them by the Jiome manures — and to the less exposure of 
the soil in the case of meadow-land — more special attention is 
required to prevent its practical exhaustion of soil-constituents, 
than in the case of arable-rotation-land. 
10. The annual yield of nitrogen per acre was, in the unmanured 
hay-crop, nearly 40 lbs. This is from one-third to one-half more 
than was annually obtained in unmatiured loheat or barley. 
11. The hay grown by mineral manures alone, yielded consi- 
derably more nitrogen per acre than that grown without manure. 
The increased amount was due to an increased growth of the 
Leguminous, and not of the Graminaceous herbage. 
12. Nitrogenous manures a/o»e (ammoniacal salts and nitrate of 
soda) gave an increase of nitrogen in the produce equal to only 
about 0)ie-fourth of that supplied in the manure. 
13. Mineral and nitrogenous manures combined gave an in- 
creased produce of nitrogen equal to from 45 to 50 per cent, of 
the nitrogen supplied in the manure. Wheat and barley, under 
similar circumstances, gave an increased produce of nitrogen 
equal to rather more than 40 per cent, of that supplied in the 
manure. Tlie rather more favourable result with the hay-crop is 
not more than is probably attributable to the more complete dis- 
tribution of tlie under-ground feeders of the crop. 
14. In the case of the meadow-grasses, as in that of tlie Grami- 
naceous plants grown in rotation, the growth was much increased 
by direct nitrogenous manures ; and, in both cases, from 50 to 60 
per cent, of the supplied introgen remained nnrecovcred in either 
the immediate, or the closely-succeeding increase of crop. 
Paiit III, — Description of Plants developed by different 
Manures. 
Perhaps the most remarkable and interesting of the effects of 
the different descriptions of manure, upon the complex herbage 
of which tlie experimental meadow was composed, was the very 
