Published date: Oct 02 2024

Journal Title: KnE Social Sciences

Issue title: 4th International Conference in Social Science (4th ICONISS): Urban Innovation

Pages: 96–104

DOI: 10.18502/kss.v9i26.17073

Merakati HandajaningsihDepartment of Agricultural Plant Production, University of Bengkulu, WR Supratman St., Kandang Limun, Bengkulu

Marwanto ‎ marwanto@unib.ac.idDepartment of Agricultural Plant Production, University of Bengkulu, WR Supratman St., Kandang Limun, Bengkulu

Frederika Verna Purdiah NingrumDepartment of Agricultural Plant Production, University of Bengkulu, WR Supratman St., Kandang Limun, Bengkulu

Priyono PrawitoDepartment of Agricultural Plant Production, University of Bengkulu, WR Supratman St., Kandang Limun, Bengkulu

This study aims to demonstrate the capability of Oil Palm Boiler Ash (OPBA)-based organomineral fertilizer (OMF) to maintain the growth, green biomass yield, and N uptake of green mustard under a reduced N application rate. This research was carried out from March to May 2021 in a research area in Bengkulu City with a Randomly Complete Block Design scheme and three replications. The treatment consisted of P₀ = control (without OMF or urea), P₁ = 200 kg urea ha⁻¹, P₂ = 325 kg OMF ha⁻⁻¹ + 50 kg urea ha⁻⁻¹, P₃ = 650 kg OMF ha⁻⁻¹ + 50 kg urea ha⁻⁻¹, P₄ = 975 kg OMF ha⁻⁻¹ + 50 kg urea ha⁻⁻¹, and P₅ = 1300 kg OMF ha⁻⁻¹ + 50 kg urea ha⁻⁻¹. The results showed that the growth and green biomass yield increased as the application rate of OMF increased. Treatment of P₅ produced the highest growth, green biomass yield, and N uptake, equivalent to P₂ treatment. The green biomass yield at P₅ was 161% higher than that at P₀. Therefore, OMF has the potential to promote the agronomic performances of green mustard under 50% reduced N dose in Ultisols.

Keywords: slow release fertilizer, nutrient management, oil palm waste, organic pellet fertilizer, green mustard

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