Multifunctional slow-release urea fertilizer from ethylcellulose and superabsorbent coated formulations

By Boli Ni, Mingzhu Liu, Shaoyu Lü. 2009

254 citations recorded by the source corpus.

The aim of this study was to prepare a double-coated, slow-release, and water-retention urea fertilizer (DSWU) to reduce environment pollution derived from excessive nitrogen fertilizer use. Ethylcellulose (EC) and crosslinked poly(acrylic acid-co-acrylamide) (P(AA-co-AM)) were used as inner and outer coating materials, respectively. The structural and chemical characteristics of the product, as well as its efficiency in slowing the nitrogen release and water evaporation in soil were examined. The nitrogen content of the product was 21.1% and its water absorbency was 70 times its own weight in tap water. Additionally, the biodegradation of EC coating in soil was assessed by differential scanning calorimetry (DSC) measurements. The results showed that the glass transition temperature (Tg) of EC coating decreased with the time prolonged, which indicated the biodegradability of EC coating in soil. These studies showed that the product with good slow-release and water-retention properties, being environmentally friendly, would find good application in agriculture and horticulture.

Subfields: Biomedical Engineering, Molecular Medicine, Pollution

View Paper: https://www.semanticscholar.org/paper/4069437a24214d9b292070dec9bf953e52cc72a7

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In Biomedical Engineering

In Molecular Medicine

Citations in the corpus

Coating materials for slow release of nitrogen from urea fertilizer: a review (2020, methodology): “A double polymeric coating material was used by Ni, Liu, and L€u (2009) to produce a controlled release urea fertilizer.”
Superabsorbent hydrogels based on polysaccharides for application in agriculture as soil conditioner and nutrient carrier: A review (2015, background): “Controlled nutrient release from biodegradable chemical hydrogels have been widely studied all over the world [108,133,135,142,144,145].”
Superabsorbent polymers in agriculture and other applications: a review (2019, background): “Sodium alginate([92]), ethyl cellulose([89]), chitosan([90]) and various polysaccharides([7]) are also used in agri-”
On the preparation and swelling properties of hydrogel nanocomposite based on Sodium alginate-g-Poly (acrylic acid-co-acrylamide)/Clinoptilolite and its application as slow release fertilizer (2014, background): “The majority of hydrogels are made from synthetic hydrophilic polymers such as poly (acrylic acid) or its copolymer with poly (acrylamide) [10, 11] while the demand for using natural hydrogels such as starch [12, 13], chitosan [14], and alginate [15] as fertilizer carriers, due to their biodegradabi”