Abstract
This study assessed the profile of plasmids in the culturable heterotrophic bacterial isolates from organic swine waste (SW) and inorganic (NPK) fertilizer amended tropical soils of the Niger Delta region in Nigeria. Plasmid DNA was extracted and analyzed by agarose gel electrophoresis. Plasmid analysis of 70 fertilizer utilizing bacterial isolates revealed the presence of plasmids with molecular weights ranging from 4.0 to 40.1kb. Twenty two (31%) out of the seventy isolates carried at least one kind of plasmid while forty eight (69%) possessed none. Seventeen (77%) of the isolates with plasmids had one plasmid each of molecular weight approximately 23.1, 25.2 or 35.7kb. Five (23%) possessed two plasmids each of molecular weight approximately 23.1 and 40.1kb, 4.3 and 32.7kb, 4.0 and 40.1kb, 23.5 and 40.1kb or 23.1 and 40.1kb respectively. Bacterial isolates taken from organic fertilizer- amended plots showed highest plasmid incidence (38%) whereas isolates from the control or non- amended plot showed the lowest plasmid incidence (25%). Statistical inferences revealed that plasmid carriage in the bacterial isolates were independent of fertilizer treatments. Key words: Fertilizer amendments, bacterial isolates, gel electrophoresis, plasmid incidence, molecular weight.
Highlights
Arable lands or soil considered fit for growing crops contain natural nutrients
Research interest are focused on the introduction of sustainable management practices such as cropping systems, fertilizer application, cultivation practices, soil organic amendments and pesticide application in agriculture to maintain soil quality and productivity while minimizing the negative effects on the environment and soil resources (Sayali et al, 2012; Weiss et al, 2012; Ndubuisi-Nnaji et al, 2010)
The results from this study revealed the prevalence of culturable heterotrophic bacterial isolates in the fertilizeramended soils and the control
Summary
Arable lands or soil considered fit for growing crops (agro soils) contain natural nutrients. Soil microorganisms act as catalyst in biochemical transformations in soil, playing vital roles in maintaining soil fertility and plant yields. They exert critical effects on ecological stability. Research interest are focused on the introduction of sustainable management practices such as cropping systems, fertilizer application, cultivation practices, soil organic amendments and pesticide application in agriculture to maintain soil quality and productivity while minimizing the negative effects on the environment and soil resources (Sayali et al, 2012; Weiss et al, 2012; Ndubuisi-Nnaji et al, 2010). This study was aimed at evaluating the plasmid incidence, profiles and carriage frequencies of bacterial isolates from organic swine waste (SW) and inorganic (NPK) fertilizer amended tropical agro soils
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