Herviyanti Herviyanti, Amsar Maulana, Irwan Darfis, Musliar Kasim, Teguh Budi Prasetyo, Darusman Darusman, Syafrimen Yasin
The agronomic use of glyphosate as a weed killer has great potential as a form of contaminant in soil and crop systems. This study aims to assess the effect of glyphosate contamination on soil chemical properties and shallot production in Inceptisols ameliorated with geo-biomaterial. Geo-biomaterials based on sub-bituminous coal (SC) and three types of biochar (B) namely rice husk (RH), young coconut waste (YCW), and bamboo (Ba), where there are five formulations with a percentage of 100% SC; 75% SC+25% B; 50% SC+50% B; 25% SC+75% B, and 100% B ~ 40 t ha-1 and control (without geo-biomaterials). Then, there are three experiments, namely E1 (SC+B-RH); E2 (SC+B-YCW), and E3 (SC+B-Ba) using a completely randomized design (CRD) with three replications. The impact of glyphosate contamination significantly changes the chemical properties (pH, CEC, organic C, total N, available P) and shallots production (fresh and dry weights of bulbs and N, P, and K-plant) in Inceptisols ameliorated with geo-biomaterial. Geo-biomaterials from the formulation of 75% SC and 25% B, can increase OC, available P, and bulb dry weight (SC+B-RH); OC, bulb fresh weight, and P-plant (SC+B-YCW) and total N, available P, K, and P-plant (SC+B-Ba) and also proved effective in overcoming glyphosate residues (GR) in Inceptisols soil and reducing GR bioavailability in shallot plants, compared to the control. Application of 75% SC+25% B can provide a multifunctional solution to improve waste optimization, soil, and plant productivity, and at the same time reduce the negative impact of residual pesticides on agricultural land. © 2025, Malaysian Society of Soil Science. All rights reserved.
Department of Soil Science and Land Resource, Agriculture Faculty, Andalas University, Limau Manis, Padang City, 25164, Indonesia; Post-Doctoral Program, Agriculture Faculty, Andalas University, Limau Manis, Padang City, 25164, Indonesia; Department of Agronomy, Agriculture Faculty, Andalas University, Limau Manis, Padang City, 25164, Indonesia; Department of Soil Science, Agriculture Faculty, Syiah Kuala University, Banda Aceh, 23111, Indonesia
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