ROOT-CROPS. 



23 



nium-salts, or as rape-cake, or both, gives a further increase 

 in the produce of the roots. But the second line of each 

 division of the table shows that a prominent effect of the 

 nitrogenous manures is also largely to increase the produc- 

 tion of leaf. 



The next Table (4) shows, first, the average proportion of Leaf and 

 leaf to 1000 of root under the four characteristically different rooi " 



TABLE 4. — Norfolk White Turnips. Grown year after year on the 

 same land. Mean of plots 4, 5, 6 — four years, 1845-1848. 



Series 1. 

 Mineral 

 manure 

 alone. 



LEAF TO 1000 ROOT. 



329 



434 



600 



418 



PER CENT. 



Dry ( In root 

 matter ( In leaf 



Nitrogen ( In root 

 in dry ( I 11 leaf 



Mineral 

 in drv 



;'{ 



In root 

 In leaf 



8.54 

 14.56 



1.60 

 3.75 



7.26 

 12.24 



8.07 

 13.54 



2.64 

 3.68 



8.22 



11.88 



7.66 

 12.43 



2.45 

 (3.68) 



9.03 

 11.12 



7.96 

 12.94 



1.78 

 (3.68) 



8.30 

 11.87 



conditions as to manuring. It also shows the percentages of 

 dry matter in the roots and in the leaves respectively, and 

 the percentages of nitrogen and of total mineral matter (ash) 

 in the dry matter. In the lower division of the table are 



