THE BATTLE OF LIFE, 107 



Superphosphate has been proved to he of little or no use 

 to other crops grown separately, except in the case of 

 tujnips, where about 8 tons per acre have been produced 

 by the use of superphosphate ; the produce without 

 manure at all, being 1 to 2 tons per acre. 



Ammonia alone. The average produce with ammonia 

 salts alone has not been very much greater than that on 

 the unmanured plots. The principal differences are in 

 the grasses, which have diminished as to number of species 

 but largely increased in proportionate amount to the other 

 plants. Agrostis vulgaris, and especially Festuca ovina, 

 both poor grasses, are so greatly favoured, that they con- 

 stitute the bulk of the crop, while other better grasses have 

 diminished, even Dactylis glomerata not being by any 

 means prominent. Ammonia salts are not propitious to 

 any of the Leguminosae, but Lotus corniculatus has had 

 slightly the advantage over the others. Among the miscel- 

 laneous plants which like the Leguminosae are well-nigh 

 banished, Rumex Acetosa had the advantage ; Conopodium 

 denudatum also seems to have benefited in some seasons. 

 The crop is generally moderate, of a rich green colour, 

 and late in ripening, with much foliage, and relatively little 

 tendency to flower. 



Nitrate of soda alone. The general results of the 

 application of this salt have been an increased proportion 

 of grasses, particularly of Festuca ovina, Alopecurus pra- 

 tensis, Holcus lanatus and Poa trivialis, P. pratensis 

 being scarcely represented. There is in general not much 

 tendency to form stem among the grasses. Leguminosaa 

 exist in but scanty proportions, but among them Lotus 



