Impact of Glyphosate Contamination on Chemical Properties of Inceptisols Amelioration with Biochar from Rice Husks, Young Coconut Waste, and Bamboo

¹ Department of Soil Science and Land Resource, Agriculture Faculty, Andalas University, Limau Manis, Padang City, 25164, Indonesia
² Doctoral Program of Agricultural Science, Postgraduate of Andalas University, Limau Manis, Padang City, 25164, Indonesia
³ Magister Program of Soil Science, Postgraduate of Andalas University, Limau Manis, Padang City, 25164, Indonesia
⁴ Bachelor Program of Soil Science, Agriculture Faculty, Andalas University, Limau Manis, Padang City, 25164, Indonesia
⁵ Department of Management, Economic Faculty, Padang State University, Air Tawar, Padang City, 25131, Indonesia

^* Corresponding author: herviyanti@agr.unand.ac.id

Abstract

Growing concerns over glyphosate herbicides, if not applied carefully, can have unintended consequences on agroecosystems. The objective of this research was to study glyphosate contamination on the chemical properties of Inceptisols ameliorated with biochar of rice husk (B-RH), young coconut waste (B-YCW), and bamboo (B-B). This study used a completely randomized design (CRD) with five treatments and three replications, namely A = Control (without ameliorants and glyphosate); B = Soil + 100 mg l^-1 glyphosate; and C = Soil + B-RH + 100 mg l^-1 glyphosate; D = Soil + B-YCW + 100 mg l^-1 glyphosate and E = Soil + B-B + 100 mg l^-1 glyphosate. The results showed that contamination from glyphosate had a significant effect on surface changes (pH, EC, CEC, Mineral, and SOM) and nutrients (SOC, total N, and available P) of Inceptisols that had been improved with 40 t ha^-1 biochar. The correlation and equation of linear regression between residues on glyphosate (RG) had a significant interaction with chemical properties of Inceptisols amended with biochar, namely exchangeable Ca [r=0.611* and RG=0.0232(Ca)-0.0079; R²=0.3728]. CEC [r=0.593* and RG=0.0018 (CEC)-0.0312; R²=0.3514]; available P [r=0.590* and RG=0.0061(P₂O₅)-0.0232; R²=0.3472] and total N [r=0.570* and RG=0.257(N)-0.0621; R²=0.4312].