Journal of Food, Agriculture and Environment
Vol 12,
Issue 3&4,2014
Online ISSN: 1459-0263
Print ISSN: 1459-0255
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A proposal to standardize herbicide sorption coefficients in Brazilian tropical soils compared to temperate soils
Author(s):
Kassio Ferreira Mendes 1*,
Marcelo Rodrigues Dos Reis 2, Ana Carolina Ribeiro Dias 3, José Ari Formiga 4, Pedro Jacob Christoffoleti 4, Valdemar Luiz Tornisielo 1Recieved Date: 2014-06-17, Accepted Date: 2014-09-30
Abstract:Current mathematical models for predicting herbicide behaviour in tropical soils use sorption coefficients (Kd) and organic carbon affinity (Koc) obtained from temperate soils, indicating that the information obtained may be distorted. Moreover, organic matter content in tropical soils varies greatly when methods and laboratories are compared; consequently, those conditions cause Koc values to vary. Thus, the objectives of this paper were to review the scientific literature and discuss problems associated with the determination, calculation and interpretation of Kd and Koc values for Brazilian tropical soils, evaluate Kd and Koc values of tropical soils using the values described in the databases for temperate soils, correlate Kd values with tropical soil properties and suggest a method for calculating standardized Kd values applicable to soils with properties similar to those reported for tropical soils. Koc values were calculated based on an OC/OM (organic carbon/organic matter) index of 0.54 for 22 herbicides. Pearson correlation was used to compare Kd values and soil properties (organic matter, OM; clay mineral, CM; potential hydrogen, pH and cation exchange capacity, CEC) for each herbicide in tropical soils. The results indicate that Kd and Koc values for herbicides in tropical soils presented an OC/OM index ranging from 0.395 to 1.275, with some similarities and differences compared to temperate soil values. The Kd values of the majority of the herbicides correlate with the variation of OM and CEC contents in tropical soils. Standardized values confer more precision and accuracy to the mathematical models when used to represent herbicide behaviour in soils with similar properties to topical soils.
Keywords:Databases,
environmental behaviour, mathematical models, soil propertiesJournal: Journal of Food, Agriculture and Environment
Year: 2014
Volume: 12
Issue: 3&4
Category: Environment
Pages: 424-433
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