520 
Philippine Journal of Science 
1920 
one-seventh, as in the case of the other 3-salt solutions here con- 
sidered) . It is a noteworthy fact that, although these rice plant- 
lets have shown themselves very sensitive to total concentration 
for the well-balanced solutions (best ones of types A and B), yet 
the yield values shown in Table 15 are practically the same for 
both total concentrations here included. This set of salt propor- 
tions is badly balanced for young rice plants but it gives equally 
good yields whether the total concentration has an osmotic value 
of 0,1 or of 1.75 atmospheres. This equality was not shown, 
however, by the appearance of the plants; those with more con- 
centrated solution were much more stunted than those with the 
weaker one (see Plate 1). 
As to general appearance, all the plants with solution type 
A looked about alike; the differences brought out by the dry 
yields were not apparent. Also, the plants with solution type 
B were like those with type A in appearance, excepting for the 
leaf injury characteristic of the former group. On the other 
hand, the plants with 3-salt solution type I were all obviously 
much stunted and the leaves were yellowish rather than of the 
deep green color found in the case of types A and B in this series. 
Comparison of the two Shive solutions (0.1 and 1.75 atmos- 
pheres) shows that the one with the higher concentration ex- 
hibited much smaller and more stunted plants than did the other, 
in spite of the similar dry-yield values from these two solutions, 
as has been remarked. An idea of the general appearance of 
these plants may be gained from the photographs given in Plate 
1, which requires no further description than that given by its 
legend. 
To summarize, this final comparative series still further em- 
phasizes and supports the conclusions reached before; namely, 
that 3-salt solution type I (with nitrate but without ammonium) 
offers no promise, with any possible set of salt proportions, for 
good growth of lowland rice plants; that 4-salt solution type 
A (with both ammonium and nitrate) gives excellent grovTh 
of these plants with salt proportions about like those of solution 
TIRISI, and with total concentrations between 0.0008 and 0.0016 
gram-molecule per liter (0.04 and 0.08 atmosphere) ; and that 
4-salt solution type B (with ammonium but without nitrate) 
may give excellent dry yields with properly selected sets of 
salt proportions (as T2R1S1) , but is nevertheless badly balanced 
for the successful growth of rice plants on account of leaf 
injury. 
