16, 6 Espino: Salt Requirements of Young Rice Plants 499 
accompanying high top yields and, conversely, it appears that 
the young rice plants generally show parallel, rather than op- 
posite, effects upon top and root production. 
Turning to the higher total concentration (0.0038 gram- 
molecule per liter, or 0.2 atmosphere), only two sets of salt pro- 
portions are indicated as of the high group of top yields (fig. 6) in 
the forward left region of the lowest triangle (the high designa- 
tion given to solution T1R4S2 appears to be erratic in some way). 
On this top diagram the low region comprises six sets of salt 
proportions, lying at the forward right apices of the second, 
High yield 
ee a Low yieid 
: MI ” 
Lm 5 \ 
im 
M Mh 
Mh ML \L 
| 
Mh 
M Mi 
Hm Hm, M 
(NH, ),SO, 
Fic. 7. Root-yield values for the thirty-five different sets of salt proportions, with high- 
medium total concentration. 
