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Spreading antibiotics in the soil affects microbial ecosystems
March 30, 2009Antibiotics used extensively in intensive livestock production may be having an adverse effect on agricultural soil ecosystems. In a presentation to the Society for General Microbiology meeting at Harrogate International Centre, today (Monday 30 March), Dr Heike Schmitt from the University of Utrecht, the Netherlands described how antibiotics passed from the animals in manure that was then spread on farmland. Although higher organisms, such as earthworms, would only be affected at unrealistic concentrations of antibiotics, changes in soil bacterial communities have been found repeatedly using molecular microbiological techniques.
Bacteria involved in the nitrogen cycle, which replenishes nutrients in the soil, seem to be particularly affected. The effects persisted over several weeks and were still seen even when the antibiotics had broken down significantly. In addition the microbial population of the soil changed as fungi replaced the bacteria suppressed by the antibiotics.
"The antibiotic concentrations that to date have been found in agricultural soils are smaller than the concentrations at which the adverse effects start occurring", said Dr Schmitt, "However, this might not be the case for 'hot spots", for example, when manure is not mixed thoroughly in the soil."
Society for General Microbiology
Society for General Microbiology
Agricultural Soil Current Events and Agricultural Soil News RSSSuperscanner helps scientists see into the unknown
Researchers at The University of Nottingham have a new weapon in their arsenal of tools to push back the boundaries of science, engineering, veterinary medicine and archaeology.
Agricultural soil erosion not contributing to global warming, study shows
Agricultural soil erosion is not a source of carbon dioxide to the atmosphere, according to research published online in Science.
Agriculture of Conservation proves to be best for cereal crops in Navarre
The application of conservation agriculture techniques to cereal crops in the semiarid zones of Navarre-57% of the surface area given over to crop cultivation in Navarre, is most profitable for conventional agriculture and improves the quality of the soil, apart from contributing to the sustainability of the environment.
Causes of rubber tree bark necrosis identified
The rubber tree, Hevea brasiliensis, is cultivated in many humid tropical countries for the latex it produces, from which is extracted natural rubber mainly used by the tyre industry. Asia alone provides almost 95 % of the world production, where the first producer is Thailand whose rubber industry earns a regular income for 10 % of the population. However, a disease is attacking rubber trees that causes irreversible drying-up of latex flow, and can affect up to 30% of trees in African, Asian and American plantations, causing marked falls in production and substantial economic losses. Termed "rubber tree bark necrosis syndrome" (RTBN), it was diagnosed in 1983 (4) in an industrial-s
Wastewater from the canning industry is not harmful to the agricultural soil
Irrigation with wastewater from the canning industry is not harmful to the quality of agricultural soil and may even, in some cases, improve it. This is the conclusion of Iñigo Abdón Virto Quecedo in his PhD thesis defended at the Public University of Navarre.
Contaminated soil pollution solution: herbicide eating bugs
Cancer-causing soil pollution from herbicide residues may be avoided in future thanks to researchers from Exeter University, who have identified bacteria which can break down a widely used toxic chemical, scientists will announce tomorrow (Thursday, 09 September 2004) at the Society for General Microbiology's 155th Meeting at Trinity College Dublin.
US researchers find first conclusive evidence that lead is linked to male infertility
US fertility experts today (Thursday 6 February) published the first conclusive evidence that lead is linked to male infertility. A report in Europe's leading reproductive medicine journal Human Reproduction[1] concludes that exposure to lead damages sperm function and may be a contributory cause of unexplained male infertility.[2] The findings have led principal investigator Dr Susan Benoff to urge doctors to measure lead in seminal plasma when evaluating men from couples with unexplained fertility. She also believes there is a case for health and safety authorities to continue re-evaluating environmental exposure limits.[3] Dr Benoff, director of the Fertility Research Laboratories at the
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