Mineral Nutrients 



139 



COMPOSITION OF 100 PAKTS OF THE PURE ASH 



slum content. Different parts of the same plant may 

 exhibit great diversity in ash content, indicating an im- 

 portant selective absorption between cells and organs. 



74. Effects of conditions upon ash content. - - For any 

 particular plant or plant product produced under diverse 

 conditions the ash content is subject to considerable varia- 

 tion ; and this variation, while most marked with respect 

 to total ash content, extends also to the ratio of the dif- 

 ferent elements of which the ash is composed. Official 

 analj'ses of the sugar-beet show an ash content, calculated 

 to dry-weight, of from 3.2 to 14.6 per cent. There may be 

 a difference with varieties of any plant, but even in the 



