Enhanced Rice (Oryza sativa L.) Plant Growth and Nutrient Contents During The Vegetative Stage Through Zinc Solubilizing Bacterial Bead Inoculation

Irsyad Sulaimi  Ramly; Nur Maizatul Idayu Othman; Aida Soraya Shamsuddin; Ali Tan Kee Zuan; Nor Hafizah Zakaria; Fadzilah Adibah Abdul Majid; Nur' Amira Hamid

doi:10.55230/mabjournal.v53i5.3113

Authors

Irsyad Sulaimi Ramly Faculty of Plantation and Agrotechnology, Universiti Teknologi Mara, Kampus Jasin, Cawangan Melaka, 77300, Merlimau, Melaka, Malaysia
Nur Maizatul Idayu Othman
nurmaizatul@uitm.edu.my
Faculty of Plantation and Agrotechnology, Universiti Teknologi Mara, Kampus Jasin, Cawangan Melaka, 77300, Merlimau, Melaka, Malaysia; Soil Conservation and Management Research Interest Group (RIG), Universiti Teknologi Mara (UiTM), Malaysia
Aida Soraya Shamsuddin Institute for Environment and Development (LESTARI), Universiti Kebangsaan Malaysia, 43600, Bangi, Selangor, Malaysia
Ali Tan Kee Zuan Department of Land Management, Faculty of Agriculture, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia
Nor Hafizah Zakaria Institute of Climate Adaptation and Marine Biotechnology (ICAMB), Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia https://orcid.org/0000-0002-9687-6386
Fadzilah Adibah Abdul Majid Institute of Climate Adaptation and Marine Biotechnology (ICAMB), Universiti Malaysia Terengganu, 21030 Kuala Nerus, Terengganu, Malaysia
Nur' Amira Hamid Faculty of Plantation and Agrotechnology, Universiti Teknologi Mara, Kampus Jasin, Cawangan Melaka, 77300, Merlimau, Melaka, Malaysia

Keywords:

Acinetobacter sp., Oryza sativa L., sustainable approach, zinc-solubilizing bacteria, zinc deficiency

Abstract

Zinc-solubilizing bacteria (ZSB) can increase zinc bioavailability in soil and transform insoluble zinc into an accessible form, which helps reduce crop zinc deficiencies, simultaneously improving soil fertility and crop nutrition. The effects of two ZSB strains, Acinetobacter nosocomialis (SR R-10) and Acinetobacter seifertii (SR-12) were evaluated in the present study on the rice plant growth and nutrient contents using the bead inoculation method. A completely randomized design (CRD) was employed and four treatments were applied: 1) non-inoculated (control), 2) SR R-10 strain, 3) SR R-12 strain, and 4) mixed inoculation of SR R-10 and SR R-12 strains. After 40 days of sowing, the growth parameters were measured. The results revealed that SR R-10 inoculant enhanced the growth by producing the tallest plant (63.47 ± 1.87 cm) and longest root (19.93 ± 0.48 cm). SR R-10-treated plants also showed the highest leaf count (32 ± 0.58 leaves) and Soil Plant Analysis Development (SPAD) value (32.67 ± 1.59). The mixed inoculant showed synergistic benefits, indicated by the higher plant height, SPAD reading, and leaf count, compared to the non-inoculated treatment. SR R-10 and mixed inoculant increased plant biomass, measuring 4.67 ± 0.30 g and 4.40 ± 0.28 g, respectively, compared to non-inoculated plants (3.19 ± 0.17 g). For nutrient content, plants with SR R-10 inoculation showed the highest concentration of nitrogen (2.24 ± 0.00%), phosphorus (0.24 ± 0.00%), potassium (2.79 ± 0.03%), and zinc (59.51 ± 2.69 mg kg^-1). Mixed inoculant also improved soil fertility by increasing the available Zn (6.17 mg kg-1) in the soil, however, it lowered the soil pH to pH 5.8. These findings highlight the potential of ZSB, particularly A. nosocomialis (SR R-10), to improve rice plant’s growth and nutritional quality and increase the bioavailability of zinc in the soil to promote sustainable agricultural practices.

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