Impact of soil fertility maintaining practice on earthworm population in low production agro-ecosyst

The study was conducted in farmland with low productivity in Huantai County, Shandong Province of China North Plain to study the impact of organic manure and chemical fertilizer application on earthworm population. The result shows that there are 3 families, 6 genera and 7 species. Drawida gisti is the dominant species. The seasonal variation of the earthworm population density has following trend: August> September>April >May>November. The chemical fertilizer increased the earthworm population compared with the control treatment in the low soil fertility agro-ecosystem. The impact of fertilizer on the earthworm population depends on the input of organic material. With the increase of the organic input, the earthworm population density is increasing. The earthworm density of the treatments has the following ascending trend: Chemical fertilizer