XL] 



MANURES FOR MANGOLDS 



317 



not be apparent in the succeeding crops but could only 

 be ascertained by analysis. The mangold differs entirely 

 from the Swede in its requirements. In the first place, 

 it will give returns for very large quantities of nitrogen ; 

 secondly, it needs much potash and but little phosphoric 

 acid in the fertiliser. The Rothamsted experiments show 

 that mangolds can be grown successfully for very many 

 years in succession upon the same land if suitable 

 fertilisers are provided. The only difBculty experienced 

 lies in the getting of a plant on the plots where the 

 tilth of the soil has been injured by long-continued 

 treatment in one particular direction. 



The results given by some of the Rothamsted plots 

 are set out in Table XCII. 



Table XCII.— Average Yield of Mangolds (Rothamsted). 

 32 Years, i 876-1 907. 



These results illustrate the following points in the 

 manuring of mangolds : — 



(i) The value of dung and of organic manures like 

 rape cake, which, by maintaining a good texture in the 

 soil, ensure a plant and a vigorous start. 



(2) The value of an addition of active nitrogenous 

 manures, particularly nitrate of soda, even when dung 

 is also used. 



(3) The importance of potash salts even when 



