EFFECT OF CHANGINCI 11 1 1: MANURES UJO 



of grasses, tlie nitrogenous iiianuiH's were (liscontiiiucd, and ii. 

 their place a complete mineral manure containing potash was 

 applied. The diagram Fig. 29 shows the elleet of this change 

 of treatment on the composition of the heritage; the columns 

 .show the average proportion of gi-asses, leguminous plants, and 



nefor.>. Aft.>r. 



U.-fore. Aflor. Hefor-. AOor. 



Plot 6. 



Change to Minerals 



from 

 Ammonium-salts. 



I 



Plot 15. 



Change to Minerals 



from 



Nitrate of Soda. 



Le|umInosa 



per cent 



i 



Plot 8. 

 Omission of Potash. 



Weeds, per cem 



Fig. 29.— Progressive effect of Changes in the Manuring on the Composition of the 

 Hay Crop. Five-year periods. 



weeds before the change, and for succe.s.sive five-year periods 

 afterwards. 



On Plot f3 annnonium-salts alone was applied up to 1868, 

 at which time the grasses constituted 03 per cent, of the 

 herbage, and the weeds 37 per cent.— tlie leguminous jjlanis 



