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All Journal Jurnal Agroqua: Media Informasi Agronomi dan Budidaya Perairan Journal of Smart Agriculture and Environmental Technology
Khairunnisa, Poppy
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Environmental Science Veterinary

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BIOKONVERSI LIMBAH PERTANIAN MENJADI BIOPESTISIDA RIZOBAKTERI ANTIFUNGAL Anggraini, Selviana; Murtini, Sri; Vajry, Indri; Khairunnisa, Poppy; Ansiska, Paisal
Jurnal Agroqua: Media Informasi Agronomi dan Budidaya Perairan Vol 23 No 2 (2025): Jurnal Agroqua
Publisher : University of Prof. Dr. Hazairin, SH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32663/ja.v23i2.5386

Abstract

Modern agriculture faces increasing challenges from soil-borne fungal pathogens such as Fusarium oxysporum, Rhizoctonia solani, and Sclerotium rolfsii, which cause severe root and wilt diseases and significantly reduce crop productivity. This study employed a qualitative–descriptive approach supported by controlled laboratory experiments to evaluate the potential of agricultural waste as an alternative, low-cost substrate for producing antifungal rhizobacterial biopesticides. Six types of agricultural waste—rice straw, rice husk, corn cob, sugarcane bagasse, coffee husk, and soybean residue—were assessed based on their C/N ratio, lignin content, biodegradability, and nutrient availability. The results indicated that substrates with moderate C/N ratios (15–25) and low lignin content, particularly soybean residue and sugarcane bagasse, promoted optimal rhizobacterial colonization, robust biofilm formation, and high production of antifungal metabolites such as chitinase and siderophores. Rhizobacteria cultured on soybean residue exhibited the strongest inhibition zone against Fusarium oxysporum (20.5 mm) and the highest plant protection efficacy (88%), with biopesticide stability maintained for up to 120 days. Two conceptual models, Substrate Structure Colonization (SSC) and Media Metabolite Effectiveness (MME), are proposed to explain the relationship between substrate structure, metabolite biosynthesis, and biopesticide performance. These findings provide a sustainable strategy for converting agricultural waste into high-value bio-based inputs, supporting circular economy practices and green agriculture initiatives.
Precision of NPK Fertilizer for Swampy Rice Based on In Situ Soil Nutrient Analysis in South Sumatra, Indonesia Khairunnisa, Poppy; Budianta, Dedik; Napoleon, Adipati
Journal of Smart Agriculture and Environmental Technology Vol. 3 No. 3 (2025): December 2025, Publised 2025-12-21
Publisher : Indonesian Soil Science Society of South Sumatra in Collaboration With Soil Science Department, Sriwijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60105/josaet.2025.3.3.119-126

Abstract

Precision of fertilizer is an approach that directs the use of fertilizers in a rational, efficient, and targeted manner, so that plants obtain sufficient nutrients for optimal growth without causing waste or negative impacts on the environment. This study aims to determining the doses of N, P, and K fertilizers that are appropriate for  swampland by implementing a site-specific fertilization approach using in situ soil analysis. This research used a systematic method with 15 sample points, Soil sampling was conducted using a composite method and soil drilling with soil depth of 0-30 cm. The parameters observed were N-total, P-available, k-exchangeable, soil pH, and C-organic. The study found that the soil in Ulak Bedil Village exhibited highly acidic conditions (pH 3.80–4.47), with varied nutrient availability. Based on soil N, P, and K analysis and rice plant nutrient requirements, site-specific fertilizer recommendations were determined. The recommended fertilizer doses are 91.30 kg ha−1 for urea, 31.03 kg ha−1 for SP-36, and 109.65 kg ha−1 for KCl. This research provides a practical guideline for the application of site-specific fertilization to rice cultivation in swampland, in order to increase yields while reducing negative impacts on the environment.
Co-Authors Adipati Napoleon Anggraini, Selviana Ansiska, Paisal Dedik Budianta sri murtini . Vajry, Indri