Urea-impregnated HAP encapsulated by lignocellulosic biomass-extruded composites: A novel slow-release fertilizer
2019
Elhassani, Chirâa Elidrissi | Essamlali, Younes | Aqlil, Meryem | Nzenguet, Annie Moussemba | Ganetri, Ikram | Zahouily, Mohamed
In the present work, novel composite materials based on coated urea with calcium phosphate encapsulated woodchip species were developed to be used as nitrogen-loaded slow release fertilizers. Urea supported calcium phosphate was used as the basic fertilizer, whereas sugarcane bagasse (Saccharum officinarum L.) and its derivatives such as lignin and cellulose were used as the wood-based coating. The synthesized composite fertilizers were characterized in relation to their structural properties by means of X-ray diffraction and FTIR analysis. The obtained products were evaluated by means of laboratory tests for solubility in water for 60 days. It was found that the rate of urea release in water was slower in the case of coated fertilizer than in the uncoated urea/HAP fertilizer and that the rate of the nutrient release process was noticeably controlled by the coating material type and the calcination temperature of the HAP support. Importantly, the Water immersion release experiments demonstrated that the developed fertilizer displayed a subsequent slow-release of nitrogen even after 60 days of release compared to the pure urea fertilizer, which released rapidly and prematurely all its nitrogen content. The best slow release pattern of urea occurred with the urea coated mesoporous HAP encapsulated by lignin over 60 days of release experiment.
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