About Lesson
Environmental conditions affecting seed germination
(1) Water: soften the seed coat, radicle elongates easily.
(2) Temperature: The larger difference (10º) between day and night favors germination
(3) Light: light favored seed（lettuce cv. Grandrapids） germination controlled by red light（660 nm） and far-red light (730nm).The seeds germinate well under darkness but poorly under light.
