Enviro-economic impact of cyanobacteria, bacteria, vinasse and pretreated rice straw to secure yield productivity of rice crop in saline soils
Abstract:
This study focused on formulating bio-organic fertilizers using solid agricultural wastes i.e., rice straw and Agro-industrial effluents i.e. vinasse to prepare liquid extracts and non-chemical additives for growing bacteria and cyanobacteria successfuly to produce biofertilizer for rice crop in saline soils, reduce harmful nitrogenous fertilizers and evaluate the enviro-economic output of this study.This study comprises of two parts The first part: A laboratory experiment for preparing rice straw broth medium (RSBM) using pretreated rice straw and vinasse as low cost organic medium for PGPR bacteria (Bacillus subtilis and Pseudomonas fluorescens), salt tolerant cyanobacteria (Spirulina platensis) and N2-fixing cyanobacteria (Nostoc muscorum and Anabaena oryzae) propagation to be used as bio-organic fertilizers for rice cultivation in saline soils in order to replace about 50% of the recommended dose of chemical N-fertilizers.The second part: The application of the formulated biofertilizer in field experiments during two successive seasons in 2012 and 2013 at Sahl El-hossinia Research Farm Station, El-Sharkia Governorate, (ARC), Egypt. The field expermients were to investigate the potentiality of the formulated biofertilizers (Cyanobacteria, bacteria and RSBM) to components about 50% of the recommended dose of urea on growth, yield and yield components of rice crop under saline soil conditions as well as studying their effects on some biological activities in soil. Results revealed that cyanobacterial counts, total bacterial counts, CO2 evolution as well as dehydrogenase (DHA) and nitrogenase (N2-ase) activities were conspicuously affected by cyanobacteria, bacteria and/or RSBM tretments best results were achieved by the combined treatment.Total phenolic content of rice shoot, rice yeild and its components and NPK uptake were studied. Results indicated that application of Cyanobacteria, bacteria and RSBM significantly increased nitrogen, phosphorus and potassium contents of rice grains and straw Moreover, the composite biofertilizer encompassing Cyanobacteria, bacteria and RSBM showed several benefits over chemical fertilizers and improved fertility of saline soils in. Additionally, using biologically fixed nitrogen as a partial alternative to chemical N-fertilizer could have great potential for limiting CO2 emissions and consequently for mitigating environmental pollution
Publication year 2015
Pages 47
Organization Name
Country Egypt
serial title N.Egypt.J.Microbiol.vol.40,January. 2015
Author(s) from ARC
AGROVOC
TERMS		 Bacteria. Cyanobacteria. Energy. Rice straw. Saline soils.
Publication Type Journal
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