ON THE SELETTION OF RAPE SEED. 



467 



CONCLUSION. 



The results of my experiments may be briefly summarized as 

 follows : — 



1. ) As to the relation of the specific gravity and the absolute 

 weight of rape seed, grains of medium specific gravity 



a. ) Have a regular shape and are large and plump. 



b. ) Are heaviest. 



c. ) Consist mainly of heavier grains when compared with 

 those having maximum or minimum specific gravity. 



2. ) The relations of the specific gravity and absolute weight of 

 rape seed to germination are as follows : — 



a. ) Seeds of medium specific gravity are always superior 

 in their germinating capacity and produce more vigorous 

 seedlings, when compared with seeds which have much higher 

 or lower specific gravity. 



b. ) Heavy seeds produce longer and heavier seedling 

 than lighter ones. 



c. ) When for a given sort of rape, seed grains are divided 

 into several groups according to their specific gravity and 

 absolute weight, heavier ones give always better results in 

 germination, and on the whole those of medium specific gravity 

 are the best for sowing. 



3. ) Results of the estimation of fat in rape seed. 



a. ) Of several sorts of rape, Colza which has the least 

 average specific gravity is richest in oil, then follows Okuna, 

 and then Chosen and Hamburg, the seeds of which latter have 

 a grater specific gravity than those of the preceding two. 



b. ) For a given sort of rape, seeds of medium specific 

 gravity are richest in oil. 



Generally it has been found that the groups of lower specific 

 gravity always contain many immature grains and those of higher 

 specific gravity smaller grains, while those of medium specific 

 gravity are richest in oil and consist of heavyjgrains of superior 

 germinative power and promising better harvest. Thus, it is 

 evident that in the case of rape, seeds of medium specific gravity 

 should be selected for sowing. For this purpose, lighter seeds 

 and foreign matters must be separated from the heaviest ones first 

 by means of fanning mills ; the latter must then be passed through 



