30 



THE ROTHAMSTED EXPERIMENTS. 



Composi- Again, we see much higher percentage of dry substance in 



and footf tne ^ ea * tnan ^ n tne root > a ^ so mucn higher percentages of 

 nitrogen, and of total mineral matter, in the dry substance 

 of the leaf. 



TABLE 8. — Swedish Turnips. Means of plots 4, 5, and 6 ; 

 ten years, 1861-1870. 



Series 1. 

 Mineral 

 manure 

 alone. 



Series 2. ; Series 3. 



Mineral Mineral 



and and 



sodium I ammoni- 



nitrate I urn-salts 



= 82 lb. ; =82 lb. 



nitrogen, j nitrogen. 



Series 4. 

 Mineral 



and 

 ammoni- 

 um-salts 



and 

 rape-cake 

 = 180 lb. 

 nitrogen. 



Series 5. 



Mineral 



and 

 rape-cake 



= 98 lb. 

 nitrogen. 



LEAP TO 1000 ROOT. 



184 



185 



191 



228 



180 



PER CENT. 



PER ACRE, LB. 



Looking to the lower division of the table, it is seen that 

 there is here again, under all conditions of manuring, much 

 more solid matter per acre in the root than in the leaf. 

 There is also more nitrogen, and more total mineral matter, 

 accumulated in the root; though the proportion of the 

 nitrogen which is accumulated in the leaf is higher than 

 in the previous experiments. 



