Urea fertilizer coated with biodegradable polymers and diatomite for slow release and water retention / Jean Felix Mukerabigwi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 6 (11/2015)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 12, N° 6 (11/2015) . - p. 1085-1094 Titre : Urea fertilizer coated with biodegradable polymers and diatomite for slow release and water retention Type de document : texte imprimé Auteurs : Jean Felix Mukerabigwi, Auteur ; Qing Wang, Auteur ; Xiaoya Ma, Auteur ; Min Liu, Auteur ; Shaojun Lei, Auteur ; Haitao Wei, Auteur ; Xueying Huang, Auteur ; Yu Cao, Auteur Année de publication : 2015 Article en page(s) : p. 1085-1094 Note générale : Bibliogr. Langues : Américain (ame) Tags : 'Water  retention'  'Slow  release  fertilizer'  'Coating  material'  Diatomite  Biopolymer  Urea Index. décimale : 667.9 Revêtements et enduits Résumé : Slow release fertilizers (SRFs) are of vital importance to improve agricultural efficiency. However, their use is still limited due to their relatively high costs. Additionally, most of coating materials used to produce SRFs are nonbiodegradable and toxic to the soil. In this context, we utilized various biopolymers such as tamarind, xanthan, and guar gums together with diatomite to coat urea fertilizer granules. In this study, tamarind–urea-diatomite (TUD), guar–urea-diatomite (GUD), and xanthan–urea-diatomite (XUD) SRF granules were prepared in the presence of epichlorohydrin as crosslinker. The nutrients slow release behavior and the water retention capacity of these SRFs in soil were determined. The water absorbency of the product was 89% TUD, 93% GUD, and 142% XUD of its own weight when it was allowed to swell in tap water at room temperature for 2 h. Poly(methacrylic acid) was applied as the outermost layer of XUD to improve the nitrogen slow release efficiency of XUD SRFs. The results showed that the product had an excellent nutrients slow release property of 79.5% and good water retention capacity of 62.9% after 28 days. This suggested that XUDM could effectively improve the utilization of fertilizer. Furthermore, being biodegradable and low cost could be beneficial in agricultural and horticultural applications. Note de contenu : - MATERIALS AND METHODS : Materials - Xanthan gum, tamarind gum, and guar gum viscosity measurement - Preparation of TUD, GUD, and XUD SRF granules - Characterization of the prepared coated urea SFRs - Measurement of water absorbency of TUD, GUD, and XUD SRFs - Slow release behavior of TUD, GUD, and XUD SRFs in soil - Slow release behavior of TUD, GUD, and XUD SRFs in soil - Largest water-holding ratio of soil with TUD, GUD, or XUD SRFs - Measurement of water retention of TUD, GUD, and XUD SRFs - Preparation of enhanced properties efficiency of XUD SRFs - RESULTS AND DISCUSSION : Morphology and characteristics of the coated fertilizers - Polysaccharides viscosity test result - Water absorbency of TUD, GUD, and XUD SRFs test results - Water retention of TUD, GUD, and XUD SRFs in soil - Largest water-holding ratio of soil with TUD, GUD, or XUD SRFs test results - Slow release behavior of TUD, GUD, and XUD SFRs in soil test results - XUD SRFs enhanced properties by applying PMAA as outermost layer DOI : 10.1007/s11998-015-9703-2 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9703-2.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24967 [article]

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