MANURING AND SUGAR CONTENT 129 



in addition to farmyard manure, the produce of roots per acre 

 was large, in some cases about twice as much as that obtained 

 in the growth of sugar-beet for the manufacture of sugar in 

 Germany or France at the present time. 



The figures in the table for Plot 1 show, however, that 

 when farmyard manure was used the amount of sugar in the 

 roots never reached 12 per cent. ; but it was the highest, 

 11 '84 per cent, on Plot 1 O, with the farmyard manure alone, 

 and the smallest crop ; it was lowest, 9 '99 per cent, on Plot 1 

 AC, with the farmyard manure and the heaviest nitrogenous 

 cross-dressing, and the heaviest crop. The roots of the other 

 series, with intermediate amounts of crop, had also inter- 

 mediate percentages of sugar namely, 10*42, 10'84, and 

 10'81. Further, the crop grown with the farmyard manure 

 alone, which had the highest percentage of sugar in the roots, 

 had the smallest amount and proportion of leaf, and the 

 smallest percentages of both nitrogen and mineral matter in 

 the dry matter of the roots ; whilst the crop yielding the 

 highest produce, but the lowest percentage of sugar in the 

 roots, had the highest proportion and amount of leaf (9 tons 

 12 cwt. per acre), and the highest percentages of nitrogen 

 and of mineral matter in the roots, conditions indicating 

 immaturity. 



The results next recorded in the table (Plots 4, 5, and 6) 

 show the amounts of roots and of sugar obtained with 

 artificial mineral manures, both when used alone and with 

 the nitrogenous cross-dressings. 



The figures further show that there was a greater produce 

 in the case of three out of the four cross-dressings where 

 potash was used as well as superphosphate ; but that the omis- 

 sion of potash was without effect where nitrate was used as the 

 source of nitrogen. 



The result with potash is fully established in other experi- 

 ments ; namely, that a liberal supply of it tends to maturation, 

 a condition favourable for the production of sugar. 



The percentage of sugar in the roots is, with one exception, 



i 



