INELUENCE OF THE ALKALI SALTS UPON THE GROWTH OF RICE PLANTS. 275 
7. Result with K 2 S0 4 and KN0 3 . 
Solutions used 
Length 
of leaf 
mm. 
Length 
of root 
mm. 
Kumber 
of roots 
A N. K 2 S0 4 30 cc. 
40 
35 
6* 
J s N. K 2 S0 4 25 cc. + T Vj N. KNOg 
5 cc. 
58 
45 
7 x 
r Vj N. K 2 S0 4 20 cc. + ^ N. KNOg 
10 cc. 
53 
38 
6* 
T \5 N. K 2 S0 4 15 cc. + l N. KNOg 
1 5 cc. 
45 
38 
6* 
L N. K 2 S0 4 10 cc. + jq N. KNOg 
20 CC. 
50 
42 
6* 
J 0 N.K 2 S0 4 5 cc. + -LN.KNO3 
25 CC. 
40 
35 
6* 
jo N - KNOg 30 cc. 
40 
35 
4* 
Distilled water 30 cc. 
68 
43 
7 
Culture period Feb. ist— Feb. 18th (1913). 
Initial length of seedlings 20 mm. 
From the results, we observe that in a mixture of these salts the toxic 
effects ef each salt is mutually counteracted, though not completely. The 
counteraction observed is doubtless due to the actions between the anions 
(CI' and S0 4 ", Gl' and N0 3 ', NOg' and S0 4 ") present in the culture media 
since the cations in both salts are the same in all combinations. It is 
also observed that the mutual counteraction between these anions is less 
than in case of cations as already described. The curve of antagonism 
between these anions shows two maxima as in the case of the antagonism 
between sodium and potassium, and the location of these maxima is 
almost constant, occurring at the point of the proportion of 5 : 25 while 
that of antagonization of SO/' toward the toxic effect of N0 3 ' appeared 
in proportion of 10 : 20. The neutralizing power of S0 4 " toward the 
toxic effect of CI' seems to be greater than that of CI' to S0 4 ". It 
seems also that N0 3 ' has superior efficacy over S0 4 " in neutralizing the 
toxic effect of the other. 
