1920] 
DUGGAR—INSOLUBLE SALTS IN BALANCED SOLUTIONS 315 
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el Culture No, do AE. 
1 2 3 5 6 y 8 9 TU LL 12 13 14 15 
Fig. 1. Yield of wheat in solutions of relatively inscluble salts. Continuous 
line is concentration 1 and broken line concentration 11 (see table 1 
(1) in the excess of CaSO, (solid phase present), (2) in the sub- 
stitution of the “insoluble” tribasic magnesium phosphate for 
the soluble MgSO,, and (3) in the greater content of KNO.. It 
wil be noticed also that cultures 4, 8, and 10 approach the 
value of the control, and all of these contain the soluble ferric 
phosphate, combined with various caleium and magnesium com- 
pounds. No culture containing either K,PO, or iron oxalate has 
yielded satisfactorily. Similarly, MgCO, in the combinations 
employed would seem to be less depressing than K;PO, but still 
unfavorable. Among the cultures mentioned as giving the higher 
yields no striking peculiarity was noted except in the case of 
No. 10, in which there was pronounced tillering at a relatively 
early period. 
With corn many cultures are ahead of the control, No. 15, 
and those in advance are again generally the cultures contain- 
ing soluble ferric phosphate, though the differences between 
the pairs containing FePO, and the salt of iron just mentioned 
