56 
RODNEY H. TRUE AND HARLEY HARRIS BARTLETT 
of 80 percent as the dividing line, the plants in the following mixtures 
absorbed most efficiently: 
40 N X 10- 
' KH2PO4 
: 20 N X 10" 
-6 Ca(N03)2 
80 N X 10- 
' MgS04, 
20 
KH2PO4 
: 20 
Ca(N03)2 
100 " 
MgS04, 
60 
KH2PO4 
: 20 " 
Ca(N03)2 
60 
MgS04, 
20 
KH2PO4 
: 60 
Ca(N03)2 
60 
MgS04, 
80 
KH2PO4 
: 40 
Ca(N03)2 
20 
MgS04, 
40 
KH2PO4 
: 60 
Ca(N03)2 
40 
MgS04, 
20 " 
KH2PO4 
: 40 
Ca(N03)2 
80 
MgS04, 
60 
KH2PO4 
140 
Ca(N03)2 
40 
MgS04, 
40 
KH2PO4 
: 40 
Ca(N03)2 
60 
MgS04, 
Absorption increased in the order listed. As in the nitrate series the 
greatest absorption generally took place from solutions in which no 
one of the three salts greatly predominated. This fact is shown 
clearly in figure 2. All of the solutions most favorable to absorption 
occupy the center of the triangle. Nevertheless the wide range of 
variation in the composition of solutions almost equally favorable to 
absorption seemed to indicate that, as far as absorption is concerned, 
Fig. 3. Graph showing the absorption maxima of the nitrate mixtures (dotted 
line) and the mixtures with unUke anions (unbroken Hne). 
