90 



Journal of Agricultural Research voi. xvni, No. 2 



These observations on soils are in harmony with the work of Stewart 

 {42) and the author (77), who found that the concentration of the soil 

 solution may be increased by fallowing and decreased by cropping. 



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Fig. 2.— Water cultures, series i. Graphs showing comparison between percentage of total nutrient 

 absorbed and percentage of total water transpired with solutions of four concentrations. 



The relation between absorption and transpiration are shown in figure 

 2. The data have been calculated in terms of percentage of total water 

 transpired and percentage of total nutrients absorbed. Very different 



