44 



THE KOTHAMSTED EXPERIMENTS. 



TABLE 13. — Sugar-Beet. Sugar per cent and per acre per annum in 

 the roots. Averages of 3 years, 1871-73; 2 years, 1874-75; and 

 5 years, 1871-75. 



SUGAR PER CENT. 



3 years, 

 1871-731 



2 years 

 1874-75 



5 years 

 1871 ~ 



•s, I 

 7 4 



5 

 4&6 



5 

 4&6 



5 

 4&6 



Superphosphate 

 / Superphosphate 

 \ and potash 



Superphosphate 

 / Superphosphate 

 \ and potash 



Superphosphate 

 / Superphosphate 

 \ and potash 



12.17 

 12.07 



10.72 

 11.22 



11.59 

 11.73 



SUGAR PER ACRE, LB. 



3 years 

 1871-73 



i 



2 years, J 

 1874-751 



5 years, J 

 1871-75] 



5 



4&6 



5 

 4&6 



5 



4&6 



Superphosphate 



{Superphosphate 

 and potash 



Superphosphate 

 / Superphosphate 

 \ and potash 



Superphosphate 

 / Superphosphate 

 \ and potash 



4407 

 4788 



2065 

 2262 



3470 

 3778 



INCREASE OF SUGAR PER ACRE OVER SERIES 1, LB. 



rears, J 

 71 -73 1 



3 years 



187^ ' 



2 years, J 

 1874-751 



5 years, 

 1871-75 



5 

 4&6 



5 



4&6 



5 

 4&6 



Superphosphate 

 / Superphosphate 

 \ and potash 



Superphosphate 

 / Superphosphate 

 \ and potash 



Superphosphate 

 / Superphosphate 

 \ and potash 



2676 

 3084 



481 

 731 



1798 

 2143 



LB. INCREASE OF SUGAR FOR 1 LB. NITROGEN IN MANURE. 



3 years, 

 1871-" 



5 years, 

 1871- " 



ars, J 

 L-73| 



ars, I 

 1-75J 



5 

 4&6 



5 

 4&6 



Superphosphate 

 / Superphosphate 

 \ and potash 



Superphosphate 

 / Superphosphate 

 \ and potash 



27.3 

 31.5 



30.6 

 36.4 



