Vol. XVIII OCXOBKR 15, 1919 No. 2 



JOURNAL OP 



AGRICULTURAL 

 RESEARCH 



CONXKNTS 



Pag« 



Rate of Absorption of Soil Constituents at Successive 



Stages of Plant Growth - - - - - - 51 



JOHN S. BURD 



(Contribution from California Agricultural Experiment Station) 



Relation of the Concentration and Reaction of the Nutrient 



Medium to the Growth and Absorption of the Plant - 73 



D. R. HOAGLAND 



( Contribution from California Agricultural Experiment Station) 



PUBLISHED BY AUTHGl^TY OF THE SECRETARY OF AGRICULTURE, 



WITH THE COOPERATION OF THE ASSOCIATION OF AMERICAN 



AGRICULTURAL COLLEGES AND EXPERIMENT STATIONS 



^W:A.SHINGTO]Sr, D. c. 



WASHINGTON : GOVERNMENT PRINTINO OFFICE : l«l« 



