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Susan Mambu
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Immunology & microbiology Mathematics Medicine & Pharmacology Physics

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Journal : Jurnal Bios Logos

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Respon Pertumbuhan Vegetatif Sawi Hijau (Brassica rapa l. Var. Tosakan ) Akibat Pemberian PGPR (Plant Growth Promoting Rhizobacteria) yang Dikombinasikan dengan Pupuk Kompos dan NPK Sagay, Kezia Sisilia; Siahaan, Parluhutan; Mambu, Susan
JURNAL BIOS LOGOS Vol 10, No 2 (2020): JURNAL BIOS LOGOS
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jbl.11.2.2020.29017

Abstract

ABSTRAKSawi hijau (Brassica rapa L. var. Tosakan ) adalah salah satu komoditi sayuran yang sudah banyak dibudidayakan. Kebutuhan masyarakat terhadap sawi hijau semakin meningkat sehingga dari permintaan konsumen sawi hijau layak dikembangkan. Faktor penting dalam budidaya tanaman yang menunjang keberhasilan produksi sawi hijau yaitu pemupukan. Penelitian ini bertujuan untuk menguji respon pertumbuhan tanaman sawi hijau (Brassica rapa L. var. Tosakan ) akibat pemberian PGPR (Plant Growth-romoting Rhizobacteria) yang dikombinasikan dengan pupuk kompos maupun NPK. Penelitian ini terdiri atas lima perlakuan yang diulangi sebanyak lima kali: P0 (tanah kebun sebagai kontrol), P1 (tanah kebun ditambah pemberian PGPR), P2 (tanah kebun, kompos ditambah pemberian PGPR), P3 (tanah kebun ditambah pupuk NPK dengan pemberian PGPR), P4 (tanah kebun ditambah NPK). Hasil penelitian menunjukan bahwa PGPR dapat meningkatkan pertumbuhan sawi hijau yang lebih baik dibandingkan dengan kontrol. Kombinasi PGPR yang memberikan hasil terbaik adalah perlakuan  PGPR yang dikombinasikan dengan pupuk NPK.Kata kunci: Sawi hijau; PGPR; Pupuk kompos; Pupuk NPK. ABSTRACTGreen mustard (Brassica rapa L. var. Tosakan) is a vegetable commodity that has been widely cultivated. Community needs for green mustard are increasing, so that the demand for green mustard consumers is worth developed. An important factor in crop cultivation that supports the success of mustard greens production is fertilization. Study aims to examine the growth response of green mustard plants (Brassica rapa L. var. Tosakan) due to the administration of PGPR (Plant Growth-romoting Rhizobacteria) combined with compost or NPK fertilizer. This study consisted of five treatments that were repeated five times: P0 (farmland as a control), P1 (garden land plus PGPR application), P2 (garden land, compost plus PGPR application), P3 (garden land plus NPK fertilizer with granting PGPR), P4 (garden land plus NPK). The results of the study showed that PGPR could generally increase the growth of green mustard better than controls. The combination of PGPR that provided the best results was the PGPR and NPK fertilizer combination.Keywords: Green mustard, PGPR, Compost fertilizer, NPK fertilizer.
Loss of Aerobic Respiration and Hydrocarbon Degradation Potential in Soils Acutely Contaminated with Used Vegetable Oil Kindangen, Wulan; Mantiri, Feky; Mambu, Susan
JURNAL BIOS LOGOS Vol. 15 No. 3 (2025): JURNAL BIOS LOGOS
Publisher : Universitas Sam Ratulangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35799/jbl.v15i3.66094

Abstract

The improper disposal of waste cooking oil (WCO) presents a significant environmental issue as it can obstruct soil pores and rapidly induce anoxia. However, the genomic-scale disturbance that occurs immediately after a spill remains poorly understood. Here, we used comparative 16S rRNA metagenomics to investigate early-stage dysbiosis in tropical alluvial–regosol soils from North Sulawesi subjected to acute WCO contamination (<3 months). We observed a significant decline in alpha diversity and a fundamental restructuring of the soil microbiome, characterized by an expansion of opportunistic Proteobacteria, particularly the order Burkholderiales, displacing a diverse native flora. Importantly, predictive functional profiling using PICRUSt2 revealed a critical metabolic bottleneck: although genes associated with aromatic-compound degradation (e.g., toluene and catechol pathways) were selectively enriched, core aerobic respiration pathways were strongly suppressed, especially cytochrome c oxidase. This physiological decoupling suggests that, while indigenous “first responder” communities retain enzymatic potential to degrade pollutants, their catabolic activity is severely constrained by physical oxygen limitation. In contrast to this acute-state pattern of Proteobacterial proliferation coupled with respiratory impairment, our prior observations from chronically WCO-contaminated soils in Bitung indicate a Firmicutes-dominated endpoint consistent with a stable, fermentation-associated community under long-term oxygen limitation. Collectively, these findings highlight immediate soil aeration as a critical intervention to unlock the latent bioremediation potential of indigenous bacterial communities.
Co-Authors Audry Agatha Lenak Feky R. Mantiri Kindangen, Wulan Mantiri, Feky Nio Song Ai Parluhutan Siahaan Sagay, Kezia Sisilia