Bui. 41, Hawaii Agr. Expt. Station. 
Plate I. 
^J IS 
&x 
■m 
Fig. 1— Comparative Availability of Phosphoric Acid in Three Types of Soil; 
Only Nitrogen and Potash Added. 
Left to right: First two pots, red-clay soil No. 2; second pair, red soil No. 3; third pair, sandy 
soil No. 1. 
Fig. 2.— Influence of Sodium Phosphate, Experiment I, Millet I. 
Left to right: Check pot*; sodium phosphate at the rate oi" 0.007, 0.014, and 0.0J1 pel cent P20i 
