570 The Philippine Journal of Science 1920 
root yields and the Ca/K-ratio values, high yields being obtained 
with the whole range of these values tested. 
The general conclusion which must be reached from these ex- 
periments is similar to that already stated by Gile,*' by Totting- 
ham, and by Shive. The effect of a certain ratio between any 
two ions in a certain total concentration appears to depend upon 
the relation of these ions to all the other ions in the nutrient 
solution; that is, upon the complex balance of ions in the nu- 
trient solution. A certain optimum ratio may be found between 
two ions, as calcium and magnesium, for example, when a cer- 
tain balance exists between all the other ions present. But if 
this balance is altered, the optimum ratio between calcium and 
magnesium, for example, would be altered. 
TABLE 10.—Cation-ratio values for solutions of series I and II; for the en- 
tire series, and for solutions giving high and low and highest and lowest 
root yields. 
Mg/Ca. Mg/K. Ca/K. 
Series Series Series | Series. Series Series 
8 II. I. il. I. IL. 
Entire series ; 
Minling oe case 0.21 0.21 0.14 0.14 0.08 0.08 
Maxima . | 18.48| 18.48 4.68} 468 2.68/ 2.68 
pee Root oa ake St OR dee ee eee 13. 22 13. 22 4.54 4.54 2.60 2.60 
Low yields: ; 
Mioiiime ss 0.54 1.65 0.14 0.14 0.08 0. 08 
RS a 13. 48 13. 48 4. 68 4.68 2,27 0. 85 
Hange 22 Seth 12. 89 12.78 4.54 4.54 2.19 0.77 
High yields 
Minima 0.381 0,21 0.14 0.19 0.08 0.17 
Maxtinié 2c 5. 48 1.75 0.75 0.80 2.68 2.68 
Range. die 5.17 1.54 0.61 0.61 2.60 2.51 
Highest yields 2.152 srg 0.58 0.45 0.19 0,20 0.35 0. 45 
Lowest yields__-._..._--....__- execs 1.02 13. 48 1.91 4.68 1.88 0.35 
Water absorption—Cultures T3R1C5 and T3R3C3 absorbed 
the greatest quantities of water in this series; the latter culture 
also absorbed the most in series I. This series agrees with se- 
ries I in the culture showing lowest water absorption (T1R1C1). 
In a general way, also, there is an agreement between the two se- 
ries in the direct relationship shown between dry yields of tops 
and roots, on the one hand, and water absorption on the other. 
Water requirement.—The results of this series disagreed with 
those of the preceding one in the exact proportions giving high- 
“Gile, P. L., Lime-magnesia ratio as influenced by concentration, Bull. 
Porto Rico Agric. Exp. Sta. 12 (1912). 
