Minjingu phosphate rock solubilization and potential for use of klebsiella variicola-mde4 and klebsiella variicola-mdg1 as biofertilizer for maize production

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dc.creatorKwaslema, Damiano
dc.creatorTindwa, Hamisi
dc.creatorAmuri, Nyambilila
dc.date.accessioned2023-07-11T07:40:05Z
dc.date.accessioned2025-08-05T07:31:47Z
dc.date.available2023-07-11T07:40:05Z
dc.date.created2023-07-11T07:40:05Z
dc.date.issued2022
dc.description.abstractLimited solubility of the Tanzania’s Minjingu phosphate rock (MPR) in non-acidic soil conditions has held back its potential for widespread use in agricultural production. This study was designed to isolate, characterize and test phosphate-solubilizing bacteria for their potential to increase solubility of MPR and enhance maize plant growth under field conditions. Ten out of 19 isolates showing greatest phosphate solubilization indices on a Pikovskaya agar medium were further characterized for other plant-growth promoting traits including production of IAA, siderophores and ammonia. Two of them, namely isolates-MdE4 and MdG1 substantially outperformed other isolates in phosphate solubilization and production of IAA, ammonia and siderophores. The two isolates molecularly identified as Klebsiella variicola-MdE4 and K. variicola-MdG1 produced up 701, 699 and 750, 680 µg/ml of soluble phosphate from tricalcium phosphate and hard Minjungu rock phosphate, respectively. Additionally, Biorock P- a biofertilizer formulation containing MdE4 and MdG1 co-cultured in a molasses-based modified broth medium retained most of the phosphate solubilizing potential and other plant-growth promoting traits of MdE4 and MdG1. Co-application of MdE1 and MdG1-containing “bio-rock P” and inorganic phosphate at 20 kg P/ha resulted in higher maize grain yield than that of positive control (40 kg P/ha) under field conditions. The two isolates- Klebsiella variicola-MdE4 and K. variicola-MdG1 have the potential for use in a biofertilizer formulation for commercial field applications.
dc.identifierhttp://www.suaire.sua.ac.tz/handle/123456789/5355
dc.identifier.urihttp://repository.costech.or.tz/handle/20.500.14732/98363
dc.languageen
dc.publisherJournal of Central European Agriculture
dc.subjectRock phosphate biofertilizer
dc.subjectBiofertilizer formulation
dc.subjectPlant growth promoting bacteria
dc.subjectInoculant
dc.titleMinjingu phosphate rock solubilization and potential for use of klebsiella variicola-mde4 and klebsiella variicola-mdg1 as biofertilizer for maize production
dc.typeArticle

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