Rare term; the more common word is 麻の実 (あさのみ).
See also: 麻の実
麻種は古くから食用や油の原料として使われてきた。
Hemp seeds have been used since ancient times as food and as a source of oil.
Compound of 麻 (あさ, 'hemp') and 種 (たね, 'seed'). The reading たね becomes だね due to rendaku.