that it is probably to be accounted for, by the slope of the land. Plots 1—3 are 

 situated lower than plots 4 — 8 and consequently suffer more from washing, in as 

 much as rain, falling on the higher situated plots, will tend to trickle down the 

 slope and find its way into the soil on the lower levels, thereby materially in- 

 creasing the "rainfall" of the lower situated plots. 



The percentage of potash and phosphoric acid in the soils to which these manures 

 have not been supplied has not yet fallen so low, that an absolute lack of one 

 or other of these constituents is probable. It is, nevertheless, to be borne in mind 

 when considering these results, that the more soluble food constituents of the soil 

 are first seized upon by the plant, and that consequently, in the plots manured 

 without potash, we have before us, soil relatively poor in soluble potash. 

 From the above table it will be noted that there is very little variation in the 

 nitrogen content of the various plots. It is consequently to be expected that 

 marked results will attend the application of a nitrogenous manure. 

 As indications of the effect of different manurial dressings on soil composition, 

 and consequently on plant growth, both figures and photographs are of the ut- 

 most value, showing clearly, as they do, the response of crops to a dressing of 

 the plant food or foods present in insufficient quantity in the soil. 



A glance at the accompanying tables will show how the ability to abstract food 

 constituents from the soil, varies in the case of grain, leguminous crops, and 

 root crops. 



42 — 



