Effect of urea, blue green algae and Azolla on nitrogen fixation and chlorophyll accumulation in soil under rice

By S. Nayak, R. Prasanna, A. Pabby, T. Dominic, Pramod Kumar Singh. Biology and Fertility of Soils, 2004

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Comparative Performance of Three Carrier Based Blue Green Algal Biofertilizers for Sustainable Rice Cultivation (2007, result): “The significant contribution of BGA to biologically fixed nitrogen (measured as acetylene reducing activity) and photosynthetic biomass (using chlorophyll accumulation as a growth index) in soil has been shown in our earlier studies (Nayak et al., 2004).”
Evaluation of synergistic effects of bacterial and cyanobacterial strains as biofertilizers for wheat (2010, methodology): “Triplicate samples of fresh soil cores (0–10 cm) were flooded with acetone-DMSO (dimethyl sulfoxide) mixture (1:1) at 4 ml g-1 soil and incubated in the dark for 3-4 days with intermittent shaking, as standardized earlier (Nayak et al. 2004).”
Effect of two species of cyanobacteria as biofertilizers on some metabolic activities, growth, and yield of pea plant (2010, background): “Saswati-Nayak et al. (2004) reported that biofertilization with blue green algae and Azolla and fertilization with urea significantly increased chlorophyll content of plant and rice yield.”
PROSPECTING CYANOBACTERIA-FORTIFIED COMPOSTS AS PLANT GROWTH PROMOTING AND BIOCONTROL AGENTS IN COTTON (2014, methodology): “The data were recorded at 663, 645, 630, 775 nm with triplicate samples, and chlorophyll a concentration was determined (Nayak et al., 2004) using a spectrophotometer.”