Effects of introducing eels on the yields and availability of fertilizer nitrogen in an integrated rice-crayfish system.

ABSTRACT: Recently, many new rice-fish co-culture models have been developed to increase economic and ecological benefits. In this study, we added eels (Monopterus albus) to a rice-crayfish system and conducted a 3-year field investigation to compare the yields and availability of fertilizer N among groups with a low density of eels, high density of eels and no eels. We performed a mesocosm experiment and used an isotope tracer technique to detect the fate of fertilizer N. The results showed that the rice yields significantly improved after the introduction of the eels. However, the introduction of a high density of eels significantly limited the crayfish yield, increased water N and N₂O emissions and decreased soil N content. The mesocosm experiment suggested that the use efficiency of f

SUBMITTER: Lv W 

PROVIDER: S-EPMC7481215 | biostudies-literature | 2020 Sep

REPOSITORIES: biostudies-literature