MA2\UAL OF AGRICULTURE. 271 



And of the ash : — 



The Turnip is a plant essentially suited to deep, loamy, light, 

 and free soils, for these easily admit of thorough pulverisation, a 

 condition of soil necessary for the development of the bulb, and 

 the descent of its tap root, \Yith its numerous diverging fibrils. 

 As can easily be understood, from the numerous cultivated 

 varieties, and the variety of soils in which turnips are sown, 

 great diversity appears on analysis, but the followiug may be 

 taken as averacres : — 



o 



The analysis of the ash gives : — 



In bulb. In top. In whole p* 



Potash, . . . .34-1 15-21 28-65 



Soda, .... 7-96 2-84 5-41 



Lime, .... 9-.93 28-49 2327 



Magnesia, . . . 2-61 281 3-09 



Oxide of iron, ... -46 1-68 '86 



Phosphoric acid, . . . 9-85 6-17 9-29 



Sulphuric acid, . . . 13-12 8-43 12-52 



Silica. .... 1-81 3-99 -86 



Carbonic acid,* . . . 11-96 9*98 



Chloride of sodium, . . 8^13 153 1605 



„ „ potassium, . . ... 5-04 s.. 



The Maiujold-varzi'l^ unlike thi; turnip, succeeds well in the 

 strongest clay soils, though it is best suited for the medium class 

 of these. On the European continent it is extensively cultivated 

 for tlu! manufacture from its saccharine compounds of the com- 

 mon sugar of connnerce. It i.-. largely substituted fjr turnips in 

 the English midl.'inds and eastern and southern counties, and in 

 Ireland also. 'I'he organic analysis of the mangold is very simihir 

 to that of the turnip, but showing a larger percentage of uon- 



• Formed by tlic oxidation of tbc carbon. 



