[Establishing the rationl number of hills of the porigonatum sibrieum]
1997
Kim In Bok [Inst. for Vegetables, Pyongyang (Democratic People's Republic of Korea)]
We decided the change of growing quantity of the aerial and underground parts according to the age and the number of hills per pyong, and made the yielding change and its model according to the greatest number of hills of a certain age to define the highest section, find that its number per pyong was about 80 hills
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