Modelling the release of nitrogen from controlled release fertiliser: Constant and decay release

Trinh, Thanh H.; KuShaari, KuZilati; Shuib, Anis Suhaila; Ismail, Lukman; Azeem, Babar

doi:10.1016/j.biosystemseng.2014.12.004

Cited by 63 publications

(31 citation statements)

References 20 publications

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“…However, with the flowing water, urea is easy to dissolve and run off while hard to be fixed by soil particles as it is a neutral organic molecule. These characteristics make the utilization rate of conventionally-formulated urea stay at a level less than 35% in developing countries where a large amount of urea is consumed [2][3][4][5][6][7][8]. The leaching fertilizer pollutes the ground water and surface water, resulting in the eutrophication of lakes and reservoirs eventually imposing risks to the ecosystem [9,10].…”

Section: Introductionmentioning

confidence: 99%

One-step method to prepare starch-based superabsorbent polymer for slow release of fertilizer

Xiao

Xie

et al. 2017

Chemical Engineering Journal

179

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Here we report the use of a one-step process of reactive melt mixing to prepare starch-based superabsorbent polymers (SBSAPs) for the slow release of urea as a fertilizer. A modified twin-rotor mixer, with improved sealing to establish an oxygen-free environment, was used to study the chemical and physical reactions during the melt-processing through monitoring the temperature and torque. The effects of the initiator (ceric ammonium nitrate, or CAN), crosslinker (N,N'-methylene-bisacrylamide, or N,N'-MBA) and saponification agent (NaOH) under different reaction conditions (time, temperature, and shear intensity) were systematically studied. Also investigated was the effect of starch with different amylose content. Fourier-transform infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA) confirmed that using this simple technique, SBSAPs were successfully prepared from either high-amylopectin starch (waxy corn starch) or high-amylose starch (Gelose 50) grafted with AM and crosslinked by N,N'-MBA. Gel strength was evaluated by rheometry, which revealed a significant increase in storage modulus (G') obtained in the crosslinked high-amylose SBSAP gels. Also, scanning electron microscopy (SEM) images showed a more sophisticated structural network with a smaller pore size in the crosslinked high-amylose gels. Urea as a fertilizer was embedded in the SBSAP gel network, and this network controlled the urea release in water. The release rate of urea depended on the gel strength, gel microstructure and water absorption capacity (WAC) of SAP, which was affected by the reaction conditions and degree of saponification.

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Section: Introductionmentioning

confidence: 99%

One-step method to prepare starch-based superabsorbent polymer for slow release of fertilizer

Xiao

Xie

et al. 2017

Chemical Engineering Journal

179

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“…29 Recently, on the basis of a finite element method (FEM), the present authors 30 proposed a multi-diffusion model that integrated diffusion through multi-layer and concentrationdependent diffusivity to solve a problem presented by the complexity in geometry and phenomena. The model has proved its robustness and reliability through a wide range of granule size and release period in prediction of the N release in water.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Release of Nitrogen from Controlled-Release Fertilizer with Imperfect Coating in Soils and Water

Trinh

KuShaari

Basit

2015

Ind. Eng. Chem. Res.

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Urea is vulnerable to losses from volatilization or leaching when applied to soils. This study proposes a porous model that couples the interfacial area ratio (IAR) equation for the diffusion of nitrogen with mass transport equation in porous medium (soil). The model presents the release of a single granule with an imperfect coating thickness in different environments. The model is validated with experiments in water and soil environments. In addition, it is compared to our previous model and shows an enhancement in its predictive ability because the imperfection of the coating layer has been integrated in the model. On the basis of the proposed model, the influence of coating variation and soil types also are investigated. In general, simulation results suggest that the coating layer imperfection leads to earlier and faster nitrogen release than an ideal one. Also, nitrogen release in soil depends on soil characteristics such as surface area, particle size, and density. The comparison with experimental observations taken from the literature has validated the model's prediction of nitrogen release in different soil types. Finally, the model has an advantage that it can model the nitrogen release either in water or soil environments. By using the input from the experimental data for the release in water, the release in soil is extrapolated based on the specific soil properties, which can be obtained from experiments or the literature.

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“…The most needed nutrients for plant growth are nitrogen. However, only 30% of nitrogen nutrients in fertilizers can be absorbed by plants while the rest is lost [1]. Lack of basic nitrogen nutrients in plants can cause plants to not grow properly.…”

Section: Introductionmentioning

confidence: 99%

Usage Of Zeolite And Chitosan Composites As Slow Release Fertilizer

Maharani¹,

Dwiningsih²,

Savana³

et al. 2018

Proceedings of the International Conference on Science and Technology (ICST 2018)

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The research with the title usage of zeolite and chitosan composites as slow release fertilizer had been done. In this research, fertilizer was made by mixing zeolite with NaNO 3 as a source of macro nutrients (nitrogen) and chitosan as a crosslinks which will later be used to provide slow release function in fertilizers. The slow release fertilizer was made by impregnating zeolite on NaNO 3 and chitosan solution. Initial characterization of slow release fertilizer functional groups was identified using FTIR instruments. The results of the characterization of slow-release fertilizer functional group are known to have shifted the zeolite characteristic peaks namely Si-O and Al-O groups which indicate the presence of Nitrogen got into the fertilizer. Nitrogen release rates were identified by UV-VIS spectrophotometer. The slowest Nitrogen release rate is zeolite-chitosan fertilizer with the ratio of zeolite and chitosan is 1:1 (%w/w), while the fastest Nitrogen release produced by zeolite fertilizer.

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Modelling the release of nitrogen from controlled release fertiliser: Constant and decay release

Cited by 63 publications

References 20 publications

One-step method to prepare starch-based superabsorbent polymer for slow release of fertilizer

One-step method to prepare starch-based superabsorbent polymer for slow release of fertilizer

Modeling the Release of Nitrogen from Controlled-Release Fertilizer with Imperfect Coating in Soils and Water

Usage Of Zeolite And Chitosan Composites As Slow Release Fertilizer

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