Effect of organic and inorganic fertilizer applications on phosphate solubilizing bacteria in the rhizosphere of maize (Zea mays L.)

Abstract

A field experiment was conducted between August and October, 2014 at the Department of Microbiology to assess the effect of organic and inorganic fertilizers on the population and activities of Phosphate Solubilizing Bacteria (PSB) in the rhizosphere of maize variety BR9928DMRSR-Y. Three treatment groups were used in the study and these were: Groups which received applications of organic fertilizer (Poultry litter) alone, groups which received applications of inorganic fertilizer (NPK) and the third group which was the control (CON) did not receive any fertilizer application. A total of twenty-three bacteria were isolated and in-vitro screening was done for different phosphate solubilization activity. The study revealed that maximum population of total heterotrophic bacteria (26.8×10 9 CFU/g) was obtained with organic fertilizer (OM) tre atment. Among the different PSB isolates, OMPSB had the highest bacterial count of 10.2×10 9 . The lowest bacterial populations were obtained from IFPSB with 6.0×10 9 CFU/g. Out of the 23 PSB isolates, 18 were positive for phosphate solubilization with OMPSB8 showing the highest zone with 16 mm. Results showed that application of organic fertilizers enhanced the bacterial population and also showed increase in phosphate solubilization activities in rhizosphere soil compared to NPK and control treatments. This shows that organic fertilizers would be able to sustain the soil fertility for a longer period by meeting the demand of present and future generations.

Compost fortification with lignocellulolytic fungi for wheat cultivation using fewer mineral fertilizers amount in sandy soil

“…Furthermore, the decomposition of organic matter by inoculated decomposers is inseparably linked with the synthesis of new organic compounds and the release of elements (mineralization) that discriminated the inoculated compost from the un-inoculated one and sequentially reflected on biodiversity in rhizobiome. In harmony with our results, Patrick and Adeniyi (2016) showed that soil treated with organic fertilizers enhanced total heterotrophic bacteria and phosphate solubilizers within the rhizosphere of maize plants compared to NPK fertilization due to the decomposition of organic matter, which is important for the proliferation of soil microorganisms in the soil. The stimulative impact of organic fertilizers against mineral fertilizers was lately reviewed by Dincă et al (2022).…”

Biochar and Compost-Based Integrated Nutrient Management: Potential for Carbon and Microbial Enrichment in Degraded Acidic and Charland Soils

“…In both soils, our findings revealed that the bacterial community population was frequently larger than the fungal community population in all treatments, as previously mentioned by Kamaa et al (2011). It has been demonstrated in previous research that organic and chemical fertilizers help PSB (Richard and Ogunjobi, 2016). In both acidic and charland soils, however, we found that IPNS or chemical fertilizer exerted on influence on PSB.…”

“…More exudates and plant compounds are released as a result of this breakdown product, which the rhizosphere bacteria can utilize. As a result, the bacterial biomass in the rhizosphere has increased (Richard and Ogunjobi, 2016).…”