Next Article in Journal
Nutrient Availability under Lettuce Grown in Rye Mulch in Histosols
Previous Article in Journal
Perennial Trees Associating with Nitrogen-Fixing Symbionts Differ in Leaf After-Life Nitrogen and Carbon Release
Article

Improving Nitrate Fertilization by Encapsulating Zn-Al Layered Double Hydroxides in Alginate Beads

1
Department of Natural Resources and Environmental Sciences, University of Illinois, Turner Hall, 1102 S. Goodwin Ave., Urbana, IL 61801, USA
2
Departamento de Solos e Nutrição de Plantas, Universidade Federal de Viçosa, Av, P. H. Rolfs-s/n, 36.570-900 Viçosa, Brazil
3
Universidade Federal de Viçosa, Instituto de Ciências Exatas e Tecnológicas, Campus Rio Paranaíba, Rodovia BR 354, km 310, CEP: 38810-000 Rio Paranaíba, MG, Brazil
*
Author to whom correspondence should be addressed.
Received: 5 September 2020 / Revised: 22 September 2020 / Accepted: 12 October 2020 / Published: 13 October 2020
Layered double hydroxides (LDH) are anionic clays that have potential as slow-release fertilizers; however, their formulation as powders makes them difficult to apply, and their slow-release properties are impaired due to instability under acidic conditions. In the work reported, Zn-Al LDH containing interlayered 15NO3 was synthesized for use as powder (LDH-N) or for encapsulation in alginate beads (LDH-AN), and then authenticated by X-ray diffraction, attenuated total reflectance-Fourier transform infrared spectroscopy, and elemental analyses. The two LDHs were compared to K15NO3 for evaluating their slow-release properties through (i) a kinetic study of NO3 release in water under dynamic conditions, and (ii) a growth chamber experiment designed to estimate fertilizer N uptake efficiency (FNUE) by growing pearl millet (Pennisetum glaucum L.) on an acidic Oxisol in the absence of N losses. Both LDH materials exhibited slow-release properties in the kinetic studies, and NO3 release was reduced for LDH-AN as compared to LDH-N. Because of these properties, FNUE measurements in the growth chamber experiment should have been lower with the LDHs than with K15NO3, but this was not the case for LDH-N, which was attributed to the structural instability of powdered LDH in the presence of soil acidity and to the exchange of NO3 by more competitive anions such as CO32−. A significant decrease in FNUE was observed for LDH-AN, demonstrating retention of slow-release behavior that most likely resulted from the presence of a physicochemical barrier having high cation-exchange and buffering capacities while limiting exposure to soil acidity and anion exchange. Alginate encapsulation expands the practical potential of LDH for slow-release NO3 fertilization. View Full-Text
Keywords: layered double hydroxides; alginate; 15N; fertilizer nitrogen uptake efficiency; nitrate; slow-release fertilizer layered double hydroxides; alginate; 15N; fertilizer nitrogen uptake efficiency; nitrate; slow-release fertilizer
Show Figures

Figure 1

  • Supplementary File 1:

    PDF-Document (PDF, 1128 KiB)

  • Externally hosted supplementary file 1
    Doi: 10.5281/zenodo.4015645
    Description: Improving nitrate fertilization by encapsulating Zn-Al layered double hydroxides in alginate beads
MDPI and ACS Style

Nunes, V.L.N.; Mulvaney, R.L.; Cantarutti, R.B.; Pinto, F.G.; Tronto, J. Improving Nitrate Fertilization by Encapsulating Zn-Al Layered Double Hydroxides in Alginate Beads. Nitrogen 2020, 1, 125-136. https://0-doi-org.brum.beds.ac.uk/10.3390/nitrogen1020011

AMA Style

Nunes VLN, Mulvaney RL, Cantarutti RB, Pinto FG, Tronto J. Improving Nitrate Fertilization by Encapsulating Zn-Al Layered Double Hydroxides in Alginate Beads. Nitrogen. 2020; 1(2):125-136. https://0-doi-org.brum.beds.ac.uk/10.3390/nitrogen1020011

Chicago/Turabian Style

Nunes, Vander L.N., Richard L. Mulvaney, Reinaldo B. Cantarutti, Frederico G. Pinto, and Jairo Tronto. 2020. "Improving Nitrate Fertilization by Encapsulating Zn-Al Layered Double Hydroxides in Alginate Beads" Nitrogen 1, no. 2: 125-136. https://0-doi-org.brum.beds.ac.uk/10.3390/nitrogen1020011

Find Other Styles

Article Access Map by Country/Region

1
Back to TopTop