INFLUENCE OF THE ALKALI SALTS UPON THE GROWTH OF RICE PLANTS. 26 1 
Salts used 
Toxic amount 
Highest stimulating amount 
n Solution 
in Soil 
in Solution 
in Soil 
MgS0 4 
too Mol. ( t ^q N.) 
Per 1000 g. Soil. 
A s - mo1 - wt - 
tooo Mol. ( 5ü q N.) 
Per 1000 g. Soi 1. 
TO-TOO g- mo1 - Wt - 
MgCl 2 
» ( » ) 
A - too ’> ’> 
A-rAu Mol. (A-Ao N.) 
T 00“500 5 » » 
CaCl 2 
V 
„ ( „ ) 
TOO » ’’ 
» » «■(») 
i00‘2000» ’> 
Na 2 S 0 4 
100 
» (*N.)l 
TO “TOO ’> ” 
TOO" 50 oMo 1 .( 5 C - X 0 0 N.) 
„ „ ,, » 
NaCl 
» (xfoN.) 
TO V >, 
too Mol. ( T0Ü N). 
T 00"?00 » ” 
Na 2 C 0 3 
too 
» ( » ) 
A » » 
200 "üV J M° 1 , (tö 0 “ 500 N -) 
TOO"TOOO « » 
NaHCOg 
TOO 
» (AN.) 
A » * 
» » » ( » ) 
TOO“TOO » » 
D. Summary. 
Taking all of the above results into consideration we may safely 
conclude as follows : 
1) The alkali salts under examination act as an agent both toxic 
and stimulating upon the germination and growth of rice plants, according 
to their amount. 
2) The amount which is toxic and that which is stimulating, varies 
with the kind of salts. 
3) The toxic effect of each salt, except magnesium sulphate and 
sodium bicarbonate, upon the germination capacity of rice seeds appears 
in concentration greater than about 1 /5 normal, while those two salts are 
toxic in 1/2 normal concentration. But, until the dilutions of the salts, 
except sodium bicarbonate, reach 1/10’ normal, [they seem to possess a 
delaying action on the germination ; for sodium bicarbonate this point is 
reached at 1/5 normal. When the dilutions of salts are greater than 1/50 
or 1/100 normal, there are indications of a beneficial action on the germi- 
nation. The highest stimulation of magnesium sulphate and chloride 
appears in concentration'of 1/500 normal while that of sodium sulphate 
and chloride appears in concentration of 1/1000 normal. Calcium chloride 
shows its maximum stimulation at 1 /5000 normal while sodium carbonate 
