Publication: The effects of neem extract and azadirachtin on soil microorganisms
1
0
Issued Date
2015
Resource Type
File Type
application/pdf
ISSN
7189516
Other identifier(s)
2-s2.0-84954531920
Rights Holder(s)
Scopus
Bibliographic Citation
Journal of Soil Science and Plant Nutrition. Vol 15, No.4 (2015), p.1071-1083
Suggested Citation
Sarawaneeyaruk S., Krajangsang S., Pringsulaka O. The effects of neem extract and azadirachtin on soil microorganisms. Journal of Soil Science and Plant Nutrition. Vol 15, No.4 (2015), p.1071-1083. doi:10.4067/S0718-95162015005000075 Retrieved from: https://hdl.handle.net/20.500.14740/5997
Author(s)
Abstract
Both neem extract and azadirachtin are widely used in agriculture as organic pesticides because they are nontoxic to humans, animals, and the environment. However, their effects on soil microorganisms and plant growth-promoting rhizobacteria (PGPR), which directly affect soil quality, remain largely unexplored. In this study, the effects of neem extract and azadirachtin on the activity of soil microbes and rhizosphere microorganisms was evaluated. We found that 0.1 and 0.4 gmL-1 of the extract and 1.25 and 2.5 μgmL-1of azadirachtin inhibited the activity of soil microorganisms in vitro. Treating soil with azadirachtin for two months reduced the number of microorganisms present, while two months of treatment with neem extract increased the number of microorganisms in both the soil and the rhizosphere. The phytopathogenic bacterium Pectobacterium carotovorum was more resistant to azadirachtin than Rhizobium sp. Moreover, treatment of mung beans with neem extract or azadirachtin reduced the number of root nodules and Trichoderma asperellum in the rhizosphere, when compared to the control. © 2015, Sociedad Chilena de la Ciencia del Suelo. All rights reserved.