LEGUMINOUS CROPS. 



107 



definite impression of the influence of nitrogenons manures 

 on carbon-assimilation, and on carbohydrate-formation. 



TABLE 34. — Estimates of the Yield and Gain op Carbon, and op 

 the Gain op Carbohydrates, per acre per annum, in various 

 Experimental Crops grown at Eothamsted. 



BARLEY 20 YEARS, 1852-71. 



Mineral manure 



Mineral manure and 43 lb. nitrogen as ammonia . 



1138 

 2088 



950 



1992 



46.3 



SUGAR-BEET 3 YEARS, 1871-73. 



Mineral manure . 

 Mineral manure and 1 

 Mineral manure and I 



i lb. nitrogen as ammonia . 

 i lb. nitrogen as nitrate 



37.1 

 47.1 



POTATOES 10 YEARS, 1876-85. 



Mineral manure . 

 Mineral manure and i 

 Mineral manure and i 



lb. nitrogen as ammonia . 

 i lb. nitrogen as nitrate 



17.5 

 16.5 



BEANS 8 YEARS, 1862 AND 1864-70. 



Mineral manure . 

 Mineral manure and 



lb. nitrogen as nitrate . 



726 

 992 



266 



474 



5.5 



It is thus seen that, independently of the underground 

 growth, the wheat was estimated to assimilate 988 lb. of 



