Impacts of certain biofertilizers on cowpea plants in sludge amended sandy soil
2000
Karem, H.A. (Atomic Energy Authority, Cairo (Egypt). National Center for Radiation Research and Technology) | Radwan, S.M.A. | Attia, M.
Sludge from El-Gabal EI-Asfer treatment plant was taken to minimize the population densities of certain microbial groups of hygienic significance throughout the treatments of gamma radiation and lime. Ten kGy dose level of gamma radiation and 20 percent lime were the optimum treatments to reduce the microbial load of sludge namely, total bacterial counts, total sporeformers, Enterococcus faecalis, total coliform, Aeromonas hydrophila and total fungi. A pot experiment was conducted to evaluate the role of arbuscular mycorrhizal fungi (AMF) and Pseudomonas fluorescens as a biological agent in controlling certain soil borne diseases and reducing the toxicity of heavy metals comparing with 20 percent lime and 10 kGy gamma radiation using 4 percent sludge application and its effect on yield of cowpea components. treatments with gamma radiation, liming and biofertilizers reduced certain soil borne diseases, moreover liming and biofertilizers reduced the concentration of heavy metals in shoots and grains of cowpea plants. However, the application of lime at the rate of 20 percent with sludge exerted negative effect in all studied parameters as compared to control (NPK) or sludge alone. The greatest values of number and fresh weight of nodules were observed under biofertilizers and gamma radiation treatments. Results revealed that significant effects on dry weight of roots and shoots as well as grain yield production of cowpea plants treated biofertilizers and gamma radiation at dose level 10 kGy under sludge application.
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