Earthworm populations at the different fertilized pastures
2007
Yamasaki, M.(Rakuno Gakuen Univ., Ebetsu, Hokkaido (Japan)) | Sasaki, H.
Surveys on the earthworm fauna in a pasture enriched by different fertilizer were carried out twice a year from 2005 to 2006. The pasture was divided into 8 plots according to the fertilization: one was a plot fertilized by manure, and others were a fertilizer plot, and a plot fertilized by bio-gas digestive fluid, respectively. The remaining plot was a control with no fertilizer. According to the results, a total of 3 genera and 4 species belonging to 2 families of the earthworm were collected. Allolobophora caliginosa was the predominant species (310 indiv., 81.8%) followed by Allolobophora japonica (52 indiv., 13.7%), Eisenia rosea (6 indiv., 1.6%) and Pheretima vittata (11 indiv., 2.9%). Although more earthworm samples were collected in autumn than in spring, no significant difference was observed. There was also no significant difference in the number of earthworm individuals and biomasses between the 4 plots and the four collection periods.
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