Adsorption-desorption behaviour of clomazone in Regosol and Chernozem agricultural soils

Abstract

Studies of adsorption and desorption of pesticides by soils are important for understanding and predicting their fate and transmission in the environment. Considering the agricultural and environmental relevance of clomazone, its sorption-desorption behaviour was studied in two widespread Serbian agricultural soil types named Regosol and Chernozem. Both phenomena are well-described by the Freundlich equation, which shows that clomazone is generally sorbed more to organic matter than to the mineral soil fractions. Chernozem, a soil containing more of both organic matter and clay, was found to bind more, and desorb less herbicide, than Regosol. Higher desorption hysteresis obtained for Chernozem could be attributed to its larger number of high-energy sorption sites, compared to Regosol. In both soils, the hysteresis effect increases with the rise of initial clomazone concentration in the soil-water system, while the percentage of desorbed amount during successive desorption cycles decreases. The presented adsorption-desorption study shows that soil composition plays an important role in clomazone behaviour and fate in the environment, and a significantly reduced probability of contamination of both the deeper soil layers and groundwater may be expected when this herbicide is found in humus-rich soils.

Plasticulture banana pepper response to clomazone applied pretransplanting

“…It has been reported that clomazone’s sorption to the soil depends more on the OM content than the soil particles (clay or sand) (Gunasekara et al 2009). However, it has also been reported that a higher clay fraction increases clomazone’s soil sorption (Đurović-Pejčev et al 2020; Li et al 2004; Loux et al 1989). For instance, Đurović-Pejčev et al (2020) reported that clomazone sorption in two soils with similar organic carbon (Regosol: 1.15% and Chernozem: 1.93%), was greater in the soil that had a higher clay content (Regosol: 23.4% and Chernozem: 28.9%); the Chernozem.…”

Adsorption behaviour of clomazone on inorganic and organically modified natural montmorillonite from Bogovina (Serbia)

“…The Freundlich parameter ( K f ) and the Langmuir parameter ( C s(0) ) demonstrated the significantly greater sorption in the organically modified montmorillonites. If we compare the K f values for clomazone sorption on HDTMA-montmorillonites and PTMA-montmorillonites with those for clomazone sorption in natural soils, organically modified montmorillonites displayed greater sorption capacity (Đurović-Pejčev et al ., 2020). Moreover, greater sorption occurred in HDTMA-montmorillonites than in PTMA-montmorillonites.…”

“…), cotton ( Gossypium hirsutum L. ), corn ( Zea mays L. ), etc. (Liebl & Norman, 1991; Culpepper et al ., 2001; TenBrook & Tjeerdema, 2006; Đurović-Pejčev et al, 2020). The effectiveness of clomazone is based on its inhibition of carotenoid pigment synthesis, which protects chlorophyll and other plant constituents from photodegradation (Duke et al ., 1985).…”

“…The effectiveness of clomazone is based on its inhibition of carotenoid pigment synthesis, which protects chlorophyll and other plant constituents from photodegradation (Duke et al ., 1985). Clomazone's properties such as water solubility (1100 mg dm –3 ), moderate mobility (normalized organic carbon to water partition coefficient ( K OC ) = 150–562 dm 3 kg –1 ), persistence in soil (half-life (DT 50 ) = 30–135 days), photolytic half-life (>3 days) and microbial degradation half-life (>2–3 weeks) make it a possible environmental contaminant of agricultural relevance (Đurović-Pejčev et al ., 2020).…”

Characterization of the clomazone sorption process in four agricultural soils using different kinetic models

“…In order to determine whether and to what extent clomazone concentrations affect its sorption kinetic behavior, the lowest and highest initial concentration previously used in clomazone sorption experiments were included in the study. 19 Short-term sorption kinetics parameters were obtained by applying the hyperbolic, pseudo-first- and pseudo-second-order models, 20 while the Elovich equation, intraparticle diffusion and two-site nonequilibrium models were used to examine the sorption mechanisms and potential rate-controlling stage. 9,15,21…”