572 Bcport of Experiments tcitJi different Mamires 



manent meadow, was to discourage tlie growth of the Leguminous 

 herbage, and to increase the produce of the Graminaceous hay. 



That by the combination of both nitrogenous and proper 

 mineral manures, the produce of Graminaceous hay was very much 

 increased. In the particular soil and seasons in question, the 

 increase obtained by the combination was far beyond the sum of 

 the increase yielded l)y tlie two descriptions of manure, when 

 each of them was used separately. 



That farmyard manure gave a considerable increase of chiefly 

 Graminaceous hay. In the soil and seasons in question, however, 

 the artificial combination of nitrogenous and mixed mineral 

 manure yielded a very much larger increase than an annual 

 dressing of 14 tons of farmyard manure. 



That peculiarly carbonaceous manures had little or no bene- 

 ficial effect on the amount of produce of the hay. That the little 

 effect (if any) which the carbonaceous manures did exhibit, 

 seemed to be favoured by admixture with mineral manures ; and 

 then (as when the mineral manures were used alone) it appeared 

 to be the Leguminous, rather than the Graminaceous herbage, that 

 was encouraged. 



That the beneficial action oi farmyard manure upon the Grass 

 crop is to be attributed chiefly to its mineral and nitrogenous 

 coiistitiients, and comparatively little to its large amount of car- 

 bonaceous substance. 



That the large increase of produce obtained by the combina- 

 tion of nitrogenous and mixed mineral manure, being almost 

 entirely Graminaceoiis, the mineral manures, when in this com- 

 bination, did not act as when used alone, in developing the highly 

 nitrogenous Leguminous heritage. The great increase in the pro- 

 duce of hay obtained by the conjunction of the mineral with the 

 nitrogenous manure is to be attributed to the supply, within a 

 limited range of the soil, of a sufficient amount of the necessary 

 mineral constituents, to enable the Graminaceous plants to turn 

 to the account of growth, the nitrogen at the same time artificially 

 supplied. 



The general result is, that the Leguminous plants in the 

 meadoiv, like those grown in our arable fields, were much in- 

 creased in growth, and assimilated more nitrogen from unaided 

 sources over a given area, when they were liberally supplied 

 with certain mineral, or primarily soil-constituents. At the same 

 time, notwithstanding the high (both percentage and acreage) 

 yield of nitrogen in Leguminous produce generally, the increased 

 growth of the Leguminous herbage of the rneadoio was not 

 favoured by the direct supply of nitrogenous manures — a result 

 which is again very similar to that obtained with the Leguminous 

 crops of our rotations. On the other hand, the Graminaceous liay 



