Effect of Mineral Manures. 



151 



separately, such manures, and especially potash manures, do 

 in a striking degree increase the yield of leguminous crops so 

 grown, and coincidently increase the amount of nitrogen they 

 assimilate per acre. Consistently with this, the mixed 

 mineral manure, containing potash, did very largely increase 

 the leguminous growth on plot 7 ; some of the gramineous 

 species, moreover, were increased to an extent hardly 

 anticipated. 



A table not reproduced here shows that over the twenty 

 years more than half as much again gramineous herbage was 

 grown by the purely mineral manure than by the unmanured 

 plot 3. Though the leguminous herbage showed a less 

 actual increase of weight than the gramineous, the pro- 

 portional increase was much greater, there being four times 

 as much grown with mineral manure as without manure. 

 Of miscellaneous herbage there was very little increase, and a 

 falling off in actual amount over the later years. 



TABLE XXXIV. NITROGEN AND ASH OF MEADOW HERBAGE. 



Table XXXIV. shows the mean percentages of nitrogen 

 and of mineral matter in the different kinds of herbage, 

 dried as hay. 



Basing the statement on the figures of Table XXXIV., it 

 appears that, whilst the average annual amount of nitrogen 

 in the gramineous herbage was 201b. without, and 29'31b. 

 with, the manure, or 9'31b. more with than without it, it was 



