ARTÍCULO

New amphiphilic composite for preparing efficient coated potassium-fertilizers for top-dressing fertilization of annual crops

Autores: Urrutia Sagardia, Óscar (Autor de correspondencia); Erro Garcés, Javier; Zabini, A; Hoshiba , K.; Blandin , A.F.; Baigorri Ekisoain, Roberto Pedro; Martín-Pastor , M.; Alis , Y.; Yvin , J.C.; García-Mina Freire, José María
Título de la revista: JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
ISSN: 0021-8561
Volumen: 66
Número: 19
Páginas: 4787 - 4799
Fecha de publicación: 2018
Lugar: WOS
Resumen:
This study describes the efficiency of a new coating material for preparing granulated potassium-fertilizers with a potassium release to the soil solution sensitive to rainfall intensity. The composite is prepared by reaction of an alkyd-resin with cement in the absence of water. The complementary use of diverse analytical techniques showed that the presence of the cement fraction induced alkyd resin reticulation and gradual cement-resin hardening. Scanning electron microscopy revealed the formation of micro and nanopores within cement-clusters, whose water permeability is affected by the resin reticulation and amphiphilic character. Potassium release was evaluated in water, soil-columns, and in soil-plant trials in pots and open-field. Agronomic results were consistent with potassium release rates obtained in water solution and soil columns. The composite-coated potassium fertilizer was more efficient than the noncoated one in providing plant available potassium, with this effect being dependent on water presence in soil.