Bentonite and anthracite in alginate-based controlled release formulations to reduce leaching of chloridazon and metribuzin in a calcareous soil

Céspedes, F. Flores; García, S. Pérez; Villafranca-Sánchez, M.; Fernández-Pérez, Manuel

doi:10.1016/j.chemosphere.2013.03.001

Cited by 35 publications

(17 citation statements)

References 25 publications

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“…The authors of that study showed that 50% of the encapsulated metribuzin was released after 25–51 days. Metribuzin release to soil from the granules prepared from a composite of alginate and bentonite or anthracite (metribuzin/alginate/bentonite or metribuzin/alginate/anthracite) was about 80% for the first 6 days at 25 °C …”

Section: Resultsmentioning

confidence: 99%

“…In fact, metribuzin has become a model herbicides to develop slow-release formulations based on various materials. 9,11,12,21,22 It is important that materials used as matrices for pesticides should both enable slow-release, targeted, and effective delivery and be readily processable and reasonably priced. 23 The cost of the product is one of the major factors determining whether a given line of research should be developed and whether the novel agrochemical formulations will be used in agriculture.…”

Section: Etcmentioning

confidence: 99%

“…This herbicide shows high biological activity under different climatic and natural conditions. In fact, metribuzin has become a model herbicides to develop slow‐release formulations based on various materials …”

Section: Introductionmentioning

confidence: 99%

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Constructing sustained‐release herbicide formulations based on poly‐3‐hydroxybutyrate and natural materials as a degradable matrix

Kiselev

Boyandin

Zhila

et al. 2019

Pest Management Science

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BACKGROUND The purpose of the present study was to develop ecofriendly herbicide formulations. Its main aim was to develop and investigate slow‐release formulations of herbicides (metribuzin, tribenuron‐methyl, and fenoxaprop‐P‐ethyl) of different structure, solubility, and specificity, which were loaded into a degradable matrix of poly‐3‐hydroxybutyrate (P(3HB)) blended with available natural materials (peat, clay, and wood flour). RESULTS Differences in the structure and physicochemical properties of the formulations were studied depending on the type of the matrix. Herbicide release and accumulation in soil were associated with the solubility of the herbicide. Fourier‐transform infrared spectroscopy showed that no chemical bonds were formed between the components in the experimental formulations. Degradation of the formulations in agro‐transformed soil in laboratory conditions was chiefly influenced by the shape of the specimens (granules or pellets) while the effect of the type of filler (peat, clay, or wood flour) was insignificant. The use of granules enabled more rapid accumulation of the herbicides in soil: their peak concentrations were reached after 3 weeks of incubation while the concentrations of the herbicides released from the pellets were the highest after 5–7 weeks. Loading of the herbicides into the polymer matrix composed of the slowly degraded P(3HB) and natural materials enabled both sustained function of the formulations in soil (lasting between 1.5 and ≥3 months) and stable activity of the otherwise rapidly inactivated herbicides such as tribenuron‐methyl and fenoxaprop‐P‐ethyl. CONCLUSION The experimental herbicide formulations enabled slow release of the active ingredients to soil. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Etcmentioning

confidence: 99%

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Constructing sustained‐release herbicide formulations based on poly‐3‐hydroxybutyrate and natural materials as a degradable matrix

Kiselev

Boyandin

Zhila

et al. 2019

Pest Management Science

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“…30 As one of the herbicide controlled release formulations, much attention has recently been paid on the preparation of clay/Alg-based formulations. 31,32 In this work, we attempted to study the intercalation of PQ herbicide onto MMT and CL clays. The next step was encapsulation of the prepared formulations using Alg capsules and then investigation of the release characteristics of these formulations under various experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

Controlled Release Systems Based on Intercalated Paraquat onto Montmorillonite and Clinoptilolite Clays Encapsulated with Sodium Alginate

2015

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As a model herbicide, paraquat (PQ) was intercalated into montmorillonite (MMT) and clinoptilolite (CL) clays at different concentrations. FT-IR, XRD, and SEM techniques were used to characterize the structures of the prepared formulations. The prepared PQ/clay samples were further encapsulated with alginate (Alg) polymer. After characterization, the potential application was verified through release of PQ from PQ/clay and PQ/clay/Alg formulations. According to the results, the release of PQ from PQ/MMT was slower than the release from the PQ/CL system. The presence of the alginate polymer in PQ/clay/Alg capsule beads caused the system to liberate PQ in a more controlled release manner than PQ/clay samples. Furthermore, the release data were fitted to empirical equations to estimate the kinetic parameters. The results suggested the feasibility of the use of clay/Alg formulations for controlled release of herbicides in agricultural applications. C 2015 Wiley Periodicals, Inc. Adv Polym Technol 2015, 0, 21597; View this article online at wileyonlinelibrary.com.

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“…Shukla et al (1991) have also observed the similar observation for the release of pesticide from the pesticide loaded polymeric matrix based on starch. Mobility experiments have shown that the use of alginate-based on release system containing chloridazon has reduced the presence of herbicides in the leachate compared to technical products, mainly for chloridazon (Flores Céspedes et al 2013). Niu and Li (2012) have prepared the urea encapsulated starch-g-poly(vinylacetate) formulation and results showed that the urea encapsulation efficiency increased with the graft efficiency of poly(vinylacetate).…”

Section: +3mentioning

confidence: 99%

Polysaccharides as safer release systems for agrochemicals

Campos

Oliveira

Fraceto

et al. 2014

Agron. Sustain. Dev.

283

175

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Agrochemicals are used to improve the production of crops. Conventional formulations of agrochemicals can contaminate the environment, in particular in the case of intensive cropping. Hence, there is a need for controlledrelease formulations of agrochemicals such as polysaccharides to reduce pollution and health hazards. Natural polysaccharides are hydrophilic, biodegradable polymers. This article reviews the use of polysaccharides in the form of micro-and nanoparticles, beads and hydrogels. The main points are: (1) slow release formulations minimize environmental impact by reducing agrochemical leaching, volatilization and degradation. For example, 50 % of the encapsulated insecticide chlorpyrifos is released in 5 days, whereas free chlorpyrifos is released in 1 day. (2) Slow release formulations increase the water-holding capacity of soil. (3) Slow release formulations better control weeds in the long run. (4) Polymer-clay formulations store ionic plant nutrients. (5) Polymer hydrogel formulations reduce compaction, erosion, and water run-off. They increase soil permeability and aeration, infiltration rates, and microbial activity, and, in turn, plant performance. In conclusion, polysaccharide formulations can be used for safer use of agrochemicals.

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Bentonite and anthracite in alginate-based controlled release formulations to reduce leaching of chloridazon and metribuzin in a calcareous soil

Cited by 35 publications

References 25 publications

Constructing sustained‐release herbicide formulations based on poly‐3‐hydroxybutyrate and natural materials as a degradable matrix

Constructing sustained‐release herbicide formulations based on poly‐3‐hydroxybutyrate and natural materials as a degradable matrix

Controlled Release Systems Based on Intercalated Paraquat onto Montmorillonite and Clinoptilolite Clays Encapsulated with Sodium Alginate

Polysaccharides as safer release systems for agrochemicals

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