94 



Journal of Agricultural Research voi. xviii, No. 



Table VIII. — Composition of nutrient solutions 

 WATER CULTURES, SEMES 3 



/a7 //* //S> £^^. • 



Fig. 4.— Water cultures, series 3. Graph showing absorption of nutrients from solutions of two con- 

 centrations and two reactions. Solutions changed weekly. 



In figure 4 the course of absorption is shown graphically, and compari- 

 sons may be made with figure 3. The absorption is plotted for conve- 

 nience as parts per million of total electrolytes absorbed, the calcula- 

 tions being based on the conductivities of the solutions. These graphs 

 demonstrate clearly that in solutions of o.io atmospheres concentration 

 (Ph 5-5). of 0.90 atmospheres (Ph 6.8), and of 0.90 atmospheres (Ph 5.1) 

 absorption continues in a fairly uniform way for the entire time. The 



