3Iixcd Herbage of Grass-Land. 
143 
about the same amount of nitrogen, but in the form of nitrate of 
soda instead of ammonia-sahs, gave considerably less produce 
but almost exactly the same proportion of Graminaceous herbage, 
and more Leguminous herbage (0 86 per cent.), than any of the 
plots manured w ith ammonia-salt. 
The better adaptation of nitrate of soda than ammonia salts as 
a manure for Leguminous plants, a fact which we have in other 
cases observed, is again seen in the results of Plot 14. In that 
case, with a smaller amount of nitrate of soda and the mixed 
mineral manure, the Leguminous herbage amounted to nearly 
.2 per cent, of the produce. There was, at the same time, a 
larger proportion of Miscellaneous or weedy herbage (18'39 per 
cent.), and consequently a smaller proportion of the Grami- 
naceous, than in any other case Avith an equally bulky crop. 
Ammonia -salts, even in conjunction with farmyard-manure, 
increased the proportion of Graminaceous plants at the expense 
of the Leguminous and Miscellaneous herbage. 
Farmvard-manure alone increased the proportion of the Gra- 
minaceous at the expense of the Leguminous herbage, the pro- 
portion of ^Miscellaneous herbage remaining about the same, 
though its character was very different, there being much fewer 
species and much greater predominance of individual weeds. 
In fact, under the influence of farmyard-manure there were fewer 
species developed within each division — Graminaceous, Legu- 
minous, and ^Miscellaneous — the manured crop affording onlv 
27 species, against 38 in one case, and 43 in another, without 
manure. 
Perhaps the most striking of the results recorded in the Table 
is that obtained on Plot 8, by means of the mixed mineral 
manure alone. Whereas, without manure we have 74 per cent. 
Graminaceous, 6 to 7 per cent. Leguminous, and nearly 20 per 
cent. ^Miscellaneous herbage ; and with the mixed mineral 
manure, and aynmonia-salts in addition, 90 to 95 per cent, of 
the produce Graminaceous, either no Leguminous herbage at 
all, or but a fraction of 1 per cent, of it, and 5 to 10 per cent, of 
Miscellaneous herbage ; we have, with mixed mineral manure 
alone, only about 66i per cent, of Graminaceous herbage, as 
much as 24 per cent Leguminous herbage, and only about 9^ per 
cent. JMiscellaneous. Thus, tw o-thirds only of the produce by 
the mixed mineral manure alone consisted of grasses, whilst 
nearly one- fourth of it consisted of clovers, meadow vetchling, 
and trefoil. The number of species was, how ever, about as high 
as without manure, and very much liigher than with the same 
mineral manure and ammonia-salts in addition. 
As already alluded to, when such mineral manures arc applied 
to crops grown separately as in rotation, instead of together in a 
