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Influence of Chinese Milkvetch (Astragalus sinicus L.) with no-tillage on soil biotic factors and rice yield

  • Min Keun Kim
  • Young Han Lee
  • Tae Ho Kang
  • Han Dae Yun
Environmental Sciences Article

Abstract

The bacterial community, biotic factors, and rice yield of Chinese Milkvetch (Astragalus sinicus L.) with no-tillage and conventional chemical fertilizer treatment were evaluated. Analysis of bacterial isolates from each treatment plots with 16S rDNA sequences revealed 486 isolates from 18 different bacterial species. The frequency of spore-forming bacteria, including Bacillus sp. and some Actinomycetes appeared to be high under low temperature conditions, whereas Proteobacteria disappeared at low temperature. Most extracellular hydrolytic enzyme activity showing bacteria belong to low G + C Gram(+) bacteria (LGCGPB) compared to high G + C Gram(−) bacteria (HGCGPB) and Proteobacteria. In addition, the total soil carbon content in Chinese Milkvetch treated soil was higher than that of conventional tilled soil samples. Rice yield was slightly higher in the conventionaltilled field (4.13±0.08 Mg/ha) compared to the Chinese Milkvetch-treated field (3.94±0.15 Mg/ha). However, the field treated with Chinese Milkvetch followed by no-tillage was effective in sustaining LGCGP bacterial species that promote biogeochemical cycling and enrich microbial biomass on paddy soil (3.94±0.15 Mg/ha). These results showed that the Chinese Milkvetch treatment with no-tillage is effective in conserving the soil environment without significant yield loss.

Key words

biotic factors chinese milkvetch green manure no-tillage rice yield 

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Copyright information

© Korean Society for Applied Biological Chemistry and Springer 2011

Authors and Affiliations

  • Min Keun Kim
    • 1
  • Young Han Lee
    • 1
  • Tae Ho Kang
    • 2
  • Han Dae Yun
    • 2
    • 3
  1. 1.Environment-friendly Research DivisionGyeongsangnam-do Agricultural Research and Extension ServiceChinjuRepublic of Korea
  2. 2.Division of Applied Life Science (BK21 Program)Gyeongsang National UniversityChinjuRepublic of Korea
  3. 3.Research Institute of Agriculture and Life ScienceGyeongsang National UniversityChinjuRepublic of Korea

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