Observations on Stimulation 

 of Plant Growths 



By 



8. Kakehi and K. Balba. 



Effect of manganese carbonate. In experiments carried 

 out at this College stimulating effects have been observed on 

 plants by manganese, applied in the form of sulphate and 

 chlorid, which salts are of course changed in the soil to humate, 

 silicate, or phosphate. In order to exclude the influence of such 

 a change, whereby also original compounds of potassium or 

 sodium are transformed to sulphate or chlorid respectively, 

 manganese was applied in out test in the form of artificial 

 carbonate in a dose of 1 g. per pot of 10 kilo soil. As general 

 manure per pot served : disodiom phosphate 10 g., sodium 

 nitrate 5 g., ammonium sulphate 5 g., potassium sulphate 6 g. 

 Two pots were sown with pea, two with barley (Oct. 10). 

 To each case were two check pots without manganese. The 

 Young plants were thinned to 10 per pot of equal size (Nov. 2). 

 The pea plants were ripe May 14, the barley May 26. The 

 harvest was weighed in the air-dry state. The result was : 





Pea. 



Barley. 





Mn-Plants. 



Check. 



Mn-Plants. 



Check. 



Total weight, g... 



(122 

 1118 



110 



84 



(89 



184 



84 

 79 



Seeds, g... 



| 41 

 I 36 



34 

 31 



|43 

 143 



40 

 39 



Hence there was exerted a moderate stimulation with pea, 

 the plus yield being 24^ , while the small difference with barley 

 (6%) is not very decisive. Also in former case pea had respon- 

 ded more to stimulation than barley. 



V This Article was published also in the Bulletin of the College of Agriculture. 

 Tokyo Imperial University. Vol. VII I, no. 3, 19.07. 



