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It has been fouiul at some centres that it is the combination of 

 superphosphate and potash that brings about the most striking 

 differences of yields; and it is interesting in this connection that the 

 only significant increase in oil content due to inanurial treatment is 

 brought about by the same combination. At other centres owing, 

 presumably, to unfavourable condition of experiment the application 

 of artificial manures seems to have had little or no effect in increasing 

 the yield of the crop. This point, however, cannot be dealt with here 

 but, together with other considerations of a purely cultural nature, is 

 reserved for a separate report. 



(Received January \illi, 1915.) 



