Early Spring type - Early Spring Kei

Japanese: アーリースプリング系 - あーりーすぷりんぐけい
Early Spring type - Early Spring Kei

...The majority of varieties currently available in Japan have been improved based on these basic varieties and developed through hybrid breeding, but since various strains have been crossbred to create a single marketed variety, it is difficult to treat them as pure varieties. The breeding that has played an important role in Japan's variety development to date includes the Jersey and Early Spring strains in early-maturing breeding, the Succession strain in mid-maturing breeding, and the Early Summer strain in summer-sown breeding. The basic cultivation types in Japan are divided into spring, summer, and autumn sowing. ...

*Some of the terminology that refers to the "Early Spring" type is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…現在日本で流通している品種は,それらの基本型品種を基にして改良され,一代雑種育種法により育成された品種が大半を占めているが,各種の系統が交配されて,一つの流通品種が成立しているので,純粋品種としての扱いは困難である。今までの日本の品種育成に重要な役割をはたしてきたものとして,早生系の育種ではジャージー系とアーリースプリング系を,中生系ではサクセッション系を,また夏まき系ではアーリーサマー系をあげることができる。日本での基本作型は,春まき,夏まき,秋まきに分かれる。…

※「アーリースプリング系」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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