Phosphate solubilization potential of indigenous rhizosphere fungi and their biofertilizer formulations
Laen...
Kuupäev
2022
Kättesaadav alates
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Estonian University of Life Sciences
Abstrakt
The harmful effects of chemical fertilizers on soil, plants, and eco-systems have
stimulated the growth of the global biofertilizer market. However, biofertilizer use remains
limited in developing countries due to inadequate research and poor technology. The use of
readily available materials for biofertilizer production can be a good starting point. This study
aimed to investigate phosphate-solubilizing potentials of soil fungi and the shelf-life of their
biofertilizer formulations using sawdust and charcoal as carriers. Soil samples from the
rhizosphere were cultured on Pikovskaya (PVK) agar, and the best phosphate solubilizers
(Aspergillus niger, Aspergillus fumigatus and A. flavus) were screened for their phosphatesolubilization potentials on solid medium. Results obtained showed that A. niger had the highest
solubilization index of 1.72, followed by A. fumigatus, and A. flavus with a solubilization index
of 1.01 and 0.95, respectively. Optimization studies showed that after 5 days of incubation,
A. niger, A. flavus and A. fumigatus solubilized 149, 112 and 126 mg L-1 of phosphate,
respectively. These values increased to 549 mg L-1 on day 11 for A. niger, 379 mg L-1 on day 9
for A. flavus and 430 mg L-1 on day 9 for A. fumigatus. Furthermore, A. fumigatus and A. flavus
proved to be better inoculants than A. niger as they maintained higher CFU g-1 counts throughout
the experiment. Also, sawdust supported higher counts of the three inoculants than charcoal and
was thus the best carrier. The findings demonstrated that these aspergilli can be harnessed for
improving soil fertility and plant development.
Kirjeldus
Received: September 28th, 2021 ; Accepted: December 13th, 2021 ; Published: December 16th, 2021 ; Correspondence: jasola@unilorin.edu.ng
Märksõnad
A. niger, A. flavus, A. fumigatus, biofertilizer, optimization, phosphate solubilization, shelf-life, articles