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Impact of Glyphosate Contamination on Chemical Properties of Inceptisols Amelioration with Biochar from Rice Husks, Young Coconut Waste, and Bamboo
Summary
Biochar amendments partially mitigated the negative effects of glyphosate contamination on soil chemical properties in Inceptisols. Rice husk biochar was most effective at stabilizing soil pH, cation exchange capacity, and organic carbon levels, suggesting biochar can help buffer agricultural soils against herbicide damage.
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(P 2 O 5 )-0.0232; R²=0.3472] and total N [r=0.570* and RG=0.257(N)-0.0621; R²=0.4312].
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