Starch derivative-based superabsorbent with integration of water-retaining and controlled-release fertilizers

Zhong, Kang; Lin, Zuan-Tao; Zheng, Xiliang; Jiang, Gang‐Biao; Yu-sheng, Fang; Mao, Xiaoyun; Zong-wen, Liao

doi:10.1016/j.carbpol.2012.10.030

Cited by 181 publications

(69 citation statements)

References 32 publications

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“…The investigation of the fertilizer release mechanism from hydrogel composite indicated that in this system the fertilizer nutrients release followed a Fickian diffusion type transport mechanism. Similar water-retaining and controlled-release fertilizers formulations have been reported in case of starch-based (Zhong et al 2013) and methyl cellulose-based (Bortolin et al 2013) formulations. Super absorbent polymer (SAP) in three levels, 0.15, 0.3, and 0.45 % have been mixed with sandy loam soil.…”

Section: +3supporting

confidence: 75%

“…Amylose is constituted of glucose units connected by α-(1,4) bonds, forming a linear chain, while amylopectin forms branched structures between the glucose units by means of α-(1,4) and α-(1,6) bonds. The relative proportions of these structures vary according to the species from which the starch is obtained, and there can be variations within the same species, depending on the degree of maturity of the plant (Denardin and da Silva 2009;Zhong et al 2013;Laycock and Halley 2014).…”

Section: Starchmentioning

confidence: 99%

“…In another study, it has been shown slower release of carbaryl from barium crosslinked alginate as compared to Cu-alginate beads. Bajpai and Sharma (2004) have found that under alkaline conditions the bariumcrosslinked beads exhibited minimum swelling but possessed Maize starch Phosphate Nutrient Zhong et al (2013) greater stability in comparison to beads crosslinked with calcium ions. The addition of additives also changes the release rate of pesticides from the release systems Kuan 1993, 1995;Fernández-Pérez et al 2000, 2001Fernández-Pérez 2007).…”

Section: Fernándezmentioning

confidence: 99%

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Polysaccharides as safer release systems for agrochemicals

Campos

Oliveira

Fraceto

et al. 2014

Agron. Sustain. Dev.

288

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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Section: +3supporting

confidence: 75%

Section: Starchmentioning

confidence: 99%

Section: Fernándezmentioning

confidence: 99%

See 1 more Smart Citation

Polysaccharides as safer release systems for agrochemicals

Campos

Oliveira

Fraceto

et al. 2014

Agron. Sustain. Dev.

288

175

View full text Add to dashboard Cite

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“…Recently, the diverse applications of superabsorbent polymers are still being expanded to many fields including agriculture and sealing composites, horticulture, drilling fluid additives, artificial snow, medicine, and so on [18][19][20][21]. Superabsorbents have been used to help conserve water in a variety of agriculture and horticultural applications [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Valorization of Superabsorbent Polymers from Used Disposable Diapers as Soil Moisture Conditioner

Orozco¹,

Timoteo-Cruz²,

Torres-Blancas³

et al. 2017

Preprint

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This study was conducted to explore the potential of superabsorbent polymers (SAPs) from used disposable diapers as soil moisture conditioner. Swelling behavior of the proposed hydrogel in response to external stimuli such as salt solutions, temperature and pH was studied. In addition, laboratory experiments were carried out to evaluate the effects of incorporation hydrogel on germination of bean (Phaseolus vulgaris L.) and pumpkin (C. pepo) seeds. The structure of the superabsorbent was characterized by Fourier transform infrared spectroscopy (FTIR). The results indicate that the proposed SAP exhibited a maximum swelling capacity of 189 g⋅g -1 of dry gel. It was observed that the swelling capacity decreased with an increase in the ionic strength of the swelling medium. When this SAP was mixed with sandy soil, the mixture was able to lose water more slowly. The seeds germination and seedling growth was remarkably influenced by the application of 0.5, 1.0 and 2.0 w/w% of SAP compared to the untreated soil. Therefore, it follows that it is possible to take advantage of SAPs property from used disposable diapers to retain the moisture in soil as an alternative to value the use of such waste, showing that it has potential for diverse applications in agriculture.

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“…In its field application, it has not been fully absorbed by the plants, but a greater part is lost to the environment (40 to 70%), particularly due to rapid leaching and surface runoff into the soil, resulting in low crop production and environment pollution (Chen et al 2008;Ni et al 2013;Thanh et al 2015). For this reason, controlled-release fertilizers made from a variety of matrix materials have been developed, such as starch, polyacrylic acid, chitosan, polylactic acid, ethyl cellulose, and poly(vinyl alcohol) (Chen et al 2008;Wu and Liu 2008;Ni et al 2009;Calabria et al 2012;Yip et al 2013;Zhong et al 2013).Nevertheless, the implementation of controlled-release fertilizers is limited by their relatively high cost, in spite of their potential benefits (Trenkel 1997). Tao et al (2011) have reported a triple polymeric layers for slow-release of urea, with water-retaining characteristics by using a combination of polyethylene, poly(acrylic acid-co-acrylamide), and poly(butyl methacrylate).…”

mentioning

confidence: 99%

Biodegradable Mulches Based on Poly(vinyl Alcohol), Kenaf Fiber, and Urea

Tan¹,

Ching²,

Gan³

et al. 2015

BioResources

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This paper describes the preparation of poly(vinyl alcohol)/kenaf fiber (PVOH/KF) composites with entrapped urea. The major FTIR peaks of these composites could be identified. These composites are intended for agricultural applications as biodegradable mulches and could be potential carrier materials for fertilizer. The water solubility, release behavior, chemical properties, and thermal stability of the composites were evaluated. The composites lost 25% of their weight after 7 days in water. In a wet environment, urea was released from the composites through its dissolution in water, and around 57% of the urea was released from the composites in 24 h; Thermagravimetric analysis showed that these composites were stable up 150 C. These composites would be able to withstand rain and protect seedlings from the sun when applied in the field as mulches. For around three to four weeks, these biobased mulches could slowly disintegrate as the PVOH binder was gradually dissolved by moisture, releasing the kenaf fibers to serve as soil fertilizer without leaving any undegradable waste for disposal. Hence, they would not pose any risks to the land or biological systems. Keywords INTRODUCTIONThere have been increasing concerns in recent years regarding environmental pollution consisting of non-biodegradable polyethylene mulch films. Previous literature has reported the uses of polyethylene films as mulches in reducing soil erosion and maintaining soil moisture for better crop growth (Adegbidi et al. 2003). Petroleum-based films are widely used due to their properties such as low density, good mechanical properties, excellent water resistance, and low cost (Nurfatimah et al. 2015). However, this synthetic plastic has generated a number of disposal difficulties because it requires huge labor forces for manual disposal. Land application is not a suitable disposal method for non-degradable plastic mulch due to its interference in the root development of subsequent crops (Kasirajan and Ngouajio 2012). An alternative disposal method for agricultural plastic wastes is through biodegradation processes.Many studies have demonstrated the use of biodegradable materials as alternatives to conventional polyethylene mulch films (Moreno and Moreno 2008). Some of the biodegradable materials used were composites developed from a combination of cellulose and starch (Moreno and Moreno 2008). These biodegradable films have not gained widespread use, possibly due to their high production cost and the unpredictable nature of their biodegradation behavior (Kasirajan and Ngouajio 2012). PEER-REVIEWED ARTICLEbioresources.com Tan et al. (2015). "PVOH/kenaf/urea mulches," BioResources 10(3), 5532-5543. 5533Poly(vinyl alcohol) (PVOH) is a non-toxic material that presents no adverse effects to biological systems, and has become highly attractive for various applications (DeMerlis and Schoneker 2003;. In the agriculture sector, PVOH could be a promising material for biodegradable mulches due to its water solubility (Guohua et al. 2006). This material ...

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Starch derivative-based superabsorbent with integration of water-retaining and controlled-release fertilizers

Cited by 181 publications

References 32 publications

Polysaccharides as safer release systems for agrochemicals

Polysaccharides as safer release systems for agrochemicals

Valorization of Superabsorbent Polymers from Used Disposable Diapers as Soil Moisture Conditioner

Biodegradable Mulches Based on Poly(vinyl Alcohol), Kenaf Fiber, and Urea

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