256 
K. MIN" AK I . 
Salts 
used 
Amount of salt added to 2000 grams of soil 
ig- 
mol. wt. 
^g. mol. wt.'y^g. mol. wt. 
J üg . mol. wt. 
Tüö§- mo1 - wt - 
TÖoö^- moL wt - Control. 
cm. 
cm. 
cm. 
cm. 
cm. 
cm. 
cm. 
died 
38.O 
50.0 
53.0 
510 
52.O , 
50.0 
45.0 
MgCI 2 
died 
470 
48.0 
54.0 
5I.O 
47.0 
45-o 
CaCl 2 
» 
>> 
died 
3 6 ° 
530 
5 l -° 
470 
450 
Na 2 S0 4 
41.0 
45.0 
45° 
47.0 
50.0 
450 
NaCl 
38.0 
46.0 
47.0 
47-o 
46.0 
4S-0 
Na 2 C0 3 
jy 
died 
39° 
46.0 
48.0 
50.0 
450 
NaHC0 3 
44.0 
450 
46.0 
48.0 
470 
45.0 
On September 30, the plants were harvested and weighed • in air dry 
state with the results as shown in p. 257. 
These results show beyond doubt that the growth of plants was injured 
or stimulated by the salts according to their amounts. Calcium chloride 
was most toxic and its injurious effect was noticeable in amount of 1/100 
gram molecular weight per 2000 grams of soil, while magnesium chloride, 
sodium sulphate, chloride and carbonate were injurious in amount of 1/20 
gram molecular weight. Magnesium sulphate and sodium bicarbonate was 
least toxic and each in amounts of 1/10 gram molecular weight per 2000 
grams soil showed an injurious effect. The stimulating action of each salt 
attained its highest degree in the pot to which had been added magnesium 
sulphate 1/20, magnesium chloride i/roo, calcium chloride 1/200, sodium 
sulphate 1/200, sodium chloride 1/100, sodium carbonate 1/200-1/1000 
and sodium bicarbonate 1/200 gram molecular weight respectively. 
On 191 2, the experiment was repeated with the same pots and the soil 
which was used 'in the previous experiment. To each pot, 1200 cc. of 
water was added and well mixed. On June 20th, five seedlings about 15 
cm. in height were transplanted. The pots were kept in the glass house 
and the evaporated water was supplemented from time to time as in the 
previous experiment. 
