蚯蚓处理添加不同硒源牛粪的比较研究OACSTPCD

According to the growth and reproduction of earthworm and the selenium enrichment in earthworms,two different selenium sources were selected and mixed into cow dung at different concentra-tions.Earthworm was used to treat cow dung to utilize manure waste from breeding industry.In this stud-y,sodium selenite and selenium-rich yeast were selected as selenium source additives to promote the en-richment of selenium by earthworm and produce high quality selenium-rich fertilizer.The effects of organic selenium and inorganic selenium on the growth and reproduction of earthworm were explored,hoping to use earthworms to treat feces and produce selenium-rich fertilizer simultaneously and thus improve the e-conomic benefits of culture of special species.By adding 2 selenium sources(sodium selenite SS,selenium-rich yeast SY)and 3 levels of selenium(5 mg·kg-1,10 mg·kg-1,15 mg·kg-1)to cow dung sub-strate,the optimal selenium enrichment amount of two selenium sources was selected in terms of selenium elements.The results showed that the growth and reproduction of earthworm was gradually inhibited with the increase of selenium content in cow dung.The higher the selenium concentration,the higher the inhibi-tion degree of earthworm growth and reproduction was.When the selenium content of SY was 15 mg· kg-1,the earthworm had an obvious toxic phenomenon.The selenium concentration was in direct propor-tion to selenium content in the earthworm.The selenium content in earthworms in SY group was signifi-cantly higher than that in SS group when the same level of SS and SY were added in cow dung.