50 



THE ROTHAMSTED EXPERIMENTS. 



TABLE 14. — Mangel-Wurzel. Average produce of 17 seasons, 

 1876-92. Quantities per acre per annum. 



Plot. 



Standard manures. 



Standard 



manures 



only. 



Standard manures, and — 



Series 2. 

 Sodium 

 nitrate 

 = 86 lb. 

 nitrogen. 



Series 3. 

 Ammoni- 

 um-salts 

 =86 lb. 

 nitrogen. 



Series 4. 

 Ammoni- 

 um-salts 

 and rape- 

 cake = 

 184 lb. 

 nitrogen. 



Series 5. 



Rape-cake 



= 98 lb. 



nitrogen. 



ROOTS. 



LEAVES. 



Farmyard manure . 

 Farmyard manure and \ 

 superphosphate / 



No mineral manure 

 Superphosphate 



Superphosphate and po-\ 

 tassium sulphate / 



Superphosphate, potassi-S 

 um, and magnesium I 

 sulphates, and sodium j 

 chloride J 



Mean of 6 and 4 



4 

 3 



18 



1 



2 18 



3 6 



