Sherif, A. E.A., Manal A.H. El-Gamal, Laila K. M. Ali and Abolmaaty, S.M.( 2015). Interactions Effect of Cyanobacterial Bioactivities and Nitrogen Fertilizers on N2o and
Co2 Emissions and Soil Productivity
Middle East Journal of Applied Sciences ISSN 2077-4613 Volume : 05 | Issue : 01 | Jan-Mar. | 2015
Pages: 119-133
Abstract: Different forms of nitrogen fertilizer are applied to cultivated soil with the ultimate goal for maximizing productivity and economic return, but it is known to affect CO2 and N2O emissions. A field experiment was carried out in 2012/2013 season at Agric. Res. Station, Giza, Egypt, to study the capability of cyanobacteria to sustain their viability in mitigate N2O and CO2 gases emitted from soil fertilized with different nitrogen fertilizer forms and their effects on some soil properties and barley yield. The nitrogen fertilizers were namely: ammonium nitrate, compost and urea-form (UF); which applied separately or in combinations to barley field; where no nitrogen fertilizer was applied to the control. Results showed that application of compost fertilizer either alone or in combination with other fertilizer forms resulted in significant increases in
dehydrogenase activity, soil respiration, organic matter, cyanobacterial population, CO2 and N2O emissions as well as nutrients availability in soils after harvest. While, less amounts of CO2 and N2O emission were monitored due to application of urea-form comparing to either compost or mineral fertilizers. Diminishing percent in N2O and CO2 emission ranged from 14.50 to 23.65 % over all treatments due to addition of
cyanobacteria, where the highest beneficial effect of cyanobacteria was attained with application of ½ compost + ½ UF. It was also demonstrated that cyanobacteria have the potential to significantly improve soil microbial activities, soil properties and nutrients availability, which in turn reflected on crop productivity increases. The results indicated that the application of ½ mineral nitrogen + ½ urea-form treatment preferably to attain the highest plant productivity, which increased grains and straw yield by 19.12 and 36.53 %, respectively due to application of cyanobacteria. High grains and straw yield and environmental efficiency could be achieved by applying ½ mineral nitrogen + ½ urea-form and cyanobacteria
Keywords: (Nitrogen fertilizers, cyanobacteria, N2O and CO2 emission, urea-form, compost, soil productivity.)
