102 PLANT LIFE ON THE FARM. 
Superphosphate has been proved to be of little or no 
use to other crops grown separately, except in the case of 
turnips, where about eight tons per acre have been pro- 
duced by the use of superphosphate ; the produce with- 
out manure at all, being one to two 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 spe- 
cies, but largely increased in proportionate amount to 
the other plants. Agrostis vulgaris, and especially Fes- 
tuca ovina, both poor grasses, are so greatly favored, . 
that they constitute 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 Leguminosx, but Lotus cor- 
niculatus has had slightly the advantage over the others. 
Among the miscellaneous plants which, like the Legu- 
minose, are well-nigh banished, Rumex Acetosa had the 
-advantage ; Conopodium denudatum also seems to have 
benefited in some seasons. The crop is generally moder- 
ate, of a rich, green color, and late in ripening, with 
much foliage, and relatively little tendency to flower. 
* 
Nitrate of Soda alone.—The general results of the ap- 
plication of this salt have been an increased proportion 
of grasses, particularly of Festuca ovina, Alopecurus pra- 
tensis, Holcus lanatus and Pod trivialis, P. pratensis 
being scarcely represented. There is in general not 
much tendency to form stem among the grasses. Legu- 
minoss exist in but scanty proportions, but among them 
Lotus corniculatus seems to have slightly the advantage. 
In the case of beans grown separately, nitrate of soda, 
unlike ammonia, is found to be beneficial. Among mis- 
ccllaneous plants, Rumen Acetosa and Centaureq nigra, 
