582 The Philippine Journal of Science 1920 
TABLE 14.—Dry weights of wheat tops and roots; for series III A, con- 
ducted from January 23 to February 24, 1917. 
Dry weights 
(6 plants). 
Culture No. Nature of solution. 
Tops. Roots. 
g. gd. 
TTR1C1 (1.60 atmospheres) -_-_.--.-------- 0.7 of osmotic concentration due 0. 712 0. 269 
to KCl, 0.1 to each of the 0. 687 0. 255 
other salts. -0. 700 0. 262 
TORS4C34 (0. 48 atmosphere) ---.-._--_---. The T7R1C1 solution with KCl 0. 753 0. 257 
omitted. Equal osmotic con- 0.690 | 0.244 
centration of the essential 0.801 0. 258 
salts. 0. 810 0. 267 
0.764 0. 257 
TOR34C34 (1.60 atmospheres) -._-..--_-___ The T7R1C1 solution with KCl 1.220| 0.879 
omitted and with concentration 1. 222 0. 410 
of other salts to give a total 1.221 0. 395 
of 1.60 atmospheres. 
T10ROCO (1.60 atmospheres) ___.___-_.--_- Single-salt solution with 1.60 0. 258 0. 100 
atmospheres osmotic con- 0. 272 0.105 
centration due to KCI. 0.265 0.108 
Returning to series III, it will be seen that with all of the ten 
sets of proportions of the salts other than potassium chloride 
the greatest dry weight of tops was produced in the solution 
having the least amount of potassium chloride; that is, for each 
set of proportions the cultures of triangle 2 gave higher yields 
than did the corresponding cultures of triangles 7, 8, and 9. 
The weight of tops varied inversely with the proportion of chlo- 
ride for the following combinations: R1C1, R24C54, R34C34, R44 
C1, R54C2}, R8C1. These data indicate that (with a given set 
of proportions of the essential salts) increased proportions of 
potassium chloride give decreased top production; though, as 
has been emphasized, this decrease is probably due merely to the 
accompanying decrease in the amounts of the essential elements. 
The highest dry yield of roots was obtained with the greatest 
partial concentration (that is, in triangle 9) of potassium chlo- 
ride with the following combinations of the essential salts: R1C1, 
R1C4}3, R24C24, R84C34, R44C1, R54C024, R8C1. Considering 
all four triangles, the weight of roots varied directly with the 
proportion of chloride for the following cultures: R1C1, R44C1, 
and R8C1. The combinations which did not give greatest dry 
weight of roots with the greatest amount of chloride were R1C8, 
R24$C5}3, R43C44. These solutions were characterized by the 
