New Urea Controlled-Release Fertilizers Based on Bentonite and Carnauba Wax

Controlled-release fertilizers are interesting alternatives to current commercial chemical fertilizers, which present a higher nutrient release rate, and can negatively impact the ecosystem. In this work, two urea controlled-release fertilizer types were manufactured from carnauba wax (CW), granulated (U), natural sodium bentonite (Bent-R Bent-Na, respectively). first type, mechanochemical method produced in bars, mixture containing different proportions of U, Bent-R, Bent-Na. second dip-coating was used coat bars with coatings CW. The cumulative evaluated over 30-day incubation period, through soil columns tests UV/visible spectroscopy. Overall, both developed work presented lower than standard fertilizers. On other hand, new method, provided that obtained by method. summary, (raw modified) promising materials for developing Furthermore, non-toxic, biodegradable, relatively inexpensive, created easily purchased Brazil, indicating have potential be on large scale.