272 



HIDEO KOMUKO 



Method of Cultivation. 



The field ussd was that of the College of Agiicultm-e, composed of humiis. 

 The distanca between the rows wjiS 2 s;/aTcu and the distance between plants 

 5 sun. Two rows (fi"out and rear) and three rows (right and left) of seeds 

 were sown for extra. 



Manure : ca. 100 gr. of stable maum'3 and 1 gr. of calcium supei-phosphate 

 were given on Oct. 26, after leveUing the field and 1.5 gr. of wood ash on 

 the day of sowing (Oct. 29). On April 2, 1!)18, diluted human manm'e mixed 

 with rice bran was given. 



Experiment V. 



This was extended during the |)eriod fi-om Oct. 28, 1917 to June 22, 

 1918. 



The seeds were steejaed in water for 24 hours, and, when their water 

 content reached 57.32%, they were exposed to the rays of 20H, 40H, 60H, 

 80H and lOOH'. Then they were sown' on Oct. 29 in humus, on which the 

 previous crop was Polygonum Oiientah L., 20 hours after irradiation. 



Caio was taken to avoid the partial richness of soil in the field. Tlie 

 weather dining the period extendiug from the end of Octijljer to the beginning 

 of December was imsuitable fur germination. Tlie dates and the numljer of 

 germinations are tabnlate<l lielow : — 



1. It took 99 minutes to get 100 H. 



2. Control seeds were CO, double the number o£ the irradiated. 



