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Thermal post-treatment alters nutrient release from a controlled-release fertilizer coated with a waterborne polymer.

Zhou Z, Du C, Li T, Shen Y, Zhou J - Sci Rep (2015)

Bottom Line: Many factors affect the release of nutrients from the waterborne polymer-coated CRF, but the effects of thermal post-treatments remain unclear.The nutrient-release model of CRF post-treated at 30 °C was the inverse "L" curve, but an increased duration of the post-treatment had no effect.The nutrient-release model was "S" curve and nutrient-release period was enhanced at higher post-treatment temperatures, and increased post-treatment duration lengthened slowed nutrient release due to a more compact membrane and a smoother membrane surface as well as a promoted crosslinking action.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.

ABSTRACT
Controlled-release fertilizers (CRF) use a controlled-release technology to enhance the nutrient use efficiency of crops. Many factors affect the release of nutrients from the waterborne polymer-coated CRF, but the effects of thermal post-treatments remain unclear. In this study, a waterborne polyacrylate-coated CRF was post-treated at different temperatures (30 °C, 60 °C, and 80 °C) and durations (2, 4, 8, 12, and 24 h) after being developed in the Wurster fluidized bed. To characterize the polyacrylate membrane, and hence to analyze the mechanism of nutrient release, Fourier transform mid-infrared spectroscopy, scanning electron microscopy, and atomic force microscopy were employed. The nutrient-release model of CRF post-treated at 30 °C was the inverse "L" curve, but an increased duration of the post-treatment had no effect. The nutrient-release model was "S" curve and nutrient-release period was enhanced at higher post-treatment temperatures, and increased post-treatment duration lengthened slowed nutrient release due to a more compact membrane and a smoother membrane surface as well as a promoted crosslinking action. CRF equipped with specified nutrient-release behaviors can be achieved by optimizing the thermal post-treatment parameters, which can contribute to the development and application of waterborne polymer-coated CRF and controlled-release technologies.

No MeSH data available.


Cumulative nutrient-release profiles from the controlled-release urea post-treated at 30 °C (A), 60 °C (B), and 80 °C (C) for 2, 4, 8, 12, and 24 h, factorially, over the incubation time at 25 °C in static distilled water. Bars indicate standard error of the mean (n = 3). Treatment details are given in Methods.
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f1: Cumulative nutrient-release profiles from the controlled-release urea post-treated at 30 °C (A), 60 °C (B), and 80 °C (C) for 2, 4, 8, 12, and 24 h, factorially, over the incubation time at 25 °C in static distilled water. Bars indicate standard error of the mean (n = 3). Treatment details are given in Methods.

Mentions: The profiles of nutrient release into distilled water from the post-treated CRF at 30 °C, 60 °C, and 80 °C for 2, 4, 8, 12, and 24 h, factorially, are shown in Fig. 1. The fastest nutrient release occurred for the 30 °C post-treatment with an 80% cumulative release at 3 d, and increased post-treatment time did not significantly change the nutrient release. Higher post-treatment temperatures (60 °C and 80 °C) slowed the controlled release, and changed the release model from the inverse “L” curve at 30 °C to the “S” curve at both 60 °C and 80 °C. The cumulative release reached 80% at about 7, 8, 9, and 10 d for the 60 °C post-treatment applied for 2, 4, 8, and 12 h, respectively; the 24 h post-treatment did not extend the duration of release. The cumulative release reached 80% at 12 d for the 80 °C post-treatments applied for 2 and 4 h, and at about 15 d for post-treatments applied for 8, 12, and 24 h.


Thermal post-treatment alters nutrient release from a controlled-release fertilizer coated with a waterborne polymer.

Zhou Z, Du C, Li T, Shen Y, Zhou J - Sci Rep (2015)

Cumulative nutrient-release profiles from the controlled-release urea post-treated at 30 °C (A), 60 °C (B), and 80 °C (C) for 2, 4, 8, 12, and 24 h, factorially, over the incubation time at 25 °C in static distilled water. Bars indicate standard error of the mean (n = 3). Treatment details are given in Methods.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4562308&req=5

f1: Cumulative nutrient-release profiles from the controlled-release urea post-treated at 30 °C (A), 60 °C (B), and 80 °C (C) for 2, 4, 8, 12, and 24 h, factorially, over the incubation time at 25 °C in static distilled water. Bars indicate standard error of the mean (n = 3). Treatment details are given in Methods.
Mentions: The profiles of nutrient release into distilled water from the post-treated CRF at 30 °C, 60 °C, and 80 °C for 2, 4, 8, 12, and 24 h, factorially, are shown in Fig. 1. The fastest nutrient release occurred for the 30 °C post-treatment with an 80% cumulative release at 3 d, and increased post-treatment time did not significantly change the nutrient release. Higher post-treatment temperatures (60 °C and 80 °C) slowed the controlled release, and changed the release model from the inverse “L” curve at 30 °C to the “S” curve at both 60 °C and 80 °C. The cumulative release reached 80% at about 7, 8, 9, and 10 d for the 60 °C post-treatment applied for 2, 4, 8, and 12 h, respectively; the 24 h post-treatment did not extend the duration of release. The cumulative release reached 80% at 12 d for the 80 °C post-treatments applied for 2 and 4 h, and at about 15 d for post-treatments applied for 8, 12, and 24 h.

Bottom Line: Many factors affect the release of nutrients from the waterborne polymer-coated CRF, but the effects of thermal post-treatments remain unclear.The nutrient-release model of CRF post-treated at 30 °C was the inverse "L" curve, but an increased duration of the post-treatment had no effect.The nutrient-release model was "S" curve and nutrient-release period was enhanced at higher post-treatment temperatures, and increased post-treatment duration lengthened slowed nutrient release due to a more compact membrane and a smoother membrane surface as well as a promoted crosslinking action.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China.

ABSTRACT
Controlled-release fertilizers (CRF) use a controlled-release technology to enhance the nutrient use efficiency of crops. Many factors affect the release of nutrients from the waterborne polymer-coated CRF, but the effects of thermal post-treatments remain unclear. In this study, a waterborne polyacrylate-coated CRF was post-treated at different temperatures (30 °C, 60 °C, and 80 °C) and durations (2, 4, 8, 12, and 24 h) after being developed in the Wurster fluidized bed. To characterize the polyacrylate membrane, and hence to analyze the mechanism of nutrient release, Fourier transform mid-infrared spectroscopy, scanning electron microscopy, and atomic force microscopy were employed. The nutrient-release model of CRF post-treated at 30 °C was the inverse "L" curve, but an increased duration of the post-treatment had no effect. The nutrient-release model was "S" curve and nutrient-release period was enhanced at higher post-treatment temperatures, and increased post-treatment duration lengthened slowed nutrient release due to a more compact membrane and a smoother membrane surface as well as a promoted crosslinking action. CRF equipped with specified nutrient-release behaviors can be achieved by optimizing the thermal post-treatment parameters, which can contribute to the development and application of waterborne polymer-coated CRF and controlled-release technologies.

No MeSH data available.