EXPERIMENTS ON TURNIPS. 



313 



and this view is borne out by the result in 1883 on land which 

 was less in need of potash. 



(C) Phosphoric Acid. — In Table XT. plots are compared with 

 superphosphate, with ground mineral, and with no phosphatic 

 manure, but with the same manures in other respects. Eight 

 cwL of superphosphate nearly doubles the crop both seasons, and 

 shows that on this soil phosphoric acid is the principal recjuire- 



Table X. 

 Potash with Dung. 



Table XL 

 Phosphoric Acid without Dung. 



