seedlac紫胶seedn.种子vi.播种；(植物)结实vt.播种seeding apparatus排种器seed drill harrow条播机耙seed rain density种子雨密度seedling floating飘秧seed preservation亲本种子seed flow reducer种子流节流器seedling dynamics幼苗动态seed disinfectant种子消毒剂,种子杀菌剂seedling clearing实生树植区seed amelioration种子改良