Abstract: This study analyzed the effects of different biogas fertilizers on the germination and seedling growth of maize （Zea may L.）, the biogas fertilizers were divided into slurries and residues as seed soaking liquid and organic fertilizer, respectively. The results showed that, 50% biogas slurry（except biogas slurry of cornstraw） mainly inhibited the germination rate and germination potential of maize seeds. However, biogas slurry of corn straw promoted seed growth, the germination rate, germination index and vitality index were increased by 2.69%, 5.04% and 131.60% respectively compared with the control. Buds and roots’ growth of maize seedlings were promoted by all biogas slurry. The weight of buds and weight of root were increased with wine dregs and vines biogas slurry separately. Biogas residue had no significant effect on the germination rate of maize seeds whire could promot the height and biomass of maize seedlings. The promotive effect of cow manure biogas residue was better than others, the height and fresh weight of seedling adding cow manure biogas residue were increased by 14.55% and 66.81% respectively compared with the control. In summary, the effect of biogas fertilizer on seed germination was either insignificant or inhibitory, while it significantly promoted the growth of seedlings.

Key words: biogas fertilizer, seed soaking in biogas slurry, fertilizing with biogas residue, germination index, maize （Zea may L.）