26 



THE ROTHAMSTED EXPERIMENTS. 



Propor- 

 tions of 

 leaf and 

 root. 



same particulars as before relating to the percentage compo- 

 sition of each, and to the amounts of the selected constituents 

 per acre in each. 



TABLE 6. — Swedish Turnips. Proportion of leaf to root, and 

 selected constituents in root and leaf, per cent and per acre. 

 Mean of plots 4, 5, and 6 ; four years, 1849-52. 



Series 1. 



Mineral 



manure 



alone. 



Series 3. 

 Mineral and 

 ammonium- 

 salts =41 lb. 



nitrogen. 



Series 4. 

 Mineral and 

 ammonium- 

 salts and 

 rape-cake = 



139 lb. 

 nitrogen. 



Series 5. 



Mineral and 



rape-cake = 



98 1b. 



nitrogen. 



LEAF TO 1000 ROOT. 



69.0 



61.8 



78.5 



65. £ 



It is seen that instead of 300 to 600 parts of leaf for 1000 

 of root, as in the white or common turnip, we have, with the 

 Swedish turnip, in no case 100 of leaf to 1000 of root. The 

 highest proportion is 78i to 1000, and this is with the highest 

 nitrogenous manuring, and the most luxuriant crops. 



It is further seen that the percentage of dry matter in the 

 root ranged from 10| to 11£, whilst in the white turnip it 

 averaged only about 8 per cent. We have, therefore, not 



