Comparative test of pliospiiates, Dwarf Ls^e\ rape Cubic cipacit\ ot pot--, ")4 i . ihic fi'et; 

 weight of earth, about 17 kilograms at 12 per cent, moisture. All pots received equal and 

 abundant nitrogen and potash. Where supplied, phosphoric acid per pot equals .44 gram. 

 From right to left: no phosphate, dissolved bone black, acid phosphate, dissolved bone, 

 steamed bone meal. South Carolina rock phosphate, Florida rock phosphate, basic slag 

 phosphate (meal). 



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Comparative test of phosphates, cabbage. Cubic capacity of pots, .545 cubic feet; weight of 

 earth, about 17 kilograms at 12 per cent, moisture. All pots received equal and abundant 

 nitrogen and potash. Where supplied, phosphoric acid per pot equals 56 gram. From 

 right to left: no phosphate, dissolved bone black, acid phosphate, dissolved bone, steamed 

 bone meal. South Carolina rock phosphate, Florida rock phosphate, basic slag phosphate 

 (meal). 



