Encapsulated organic–mineral fertilizers with nanoporous structure

Abstract

Research to obtain a long-acting encapsulated fertilizer has been carried out. The performed physicochemical studies confirmed the production of a high-quality phosphate-containing shell on the carbamide prill surface. Solubility of proposed samples were analyzed. The effectiveness of the developed compositions of the encapsulated fertilizer shell was determined. Studies in soil columns were carried out to assess nitrogen leaching. The method of scanning microscopy with elemental microanalysis was used to study the quantitative and qualitative characteristics of the shell and the interface between the outer phosphate layer of the coating and the surface of the urea prill. It is shown that the presence of deep tortuous nanopores in the structure of the phosphate-containing coating allows the penetration of soil moisture into the granule and the successive dissolution of the organic part of the shell and the nitrogen core of the encapsulated granule.

Encapsulated slow-release fertilizers: A review

“…The above is possible through the use of SRFs, which consist usually from nutrients covered or dispersed in an organic or inorganic hydrophobic material, A key point for the making of SRF is selecting the right material for encapsulation. Its selection depends on its physicochemical and biochemical properties, but also, on external factors like cost and availability (Jafari et al, 2017;Vakal et al, 2019Yanovska et al, 2022). However, considering a system for SRF, some criteria have been proposed for its use under specific test conditions: (i) the fertilizer release must not be more than 15 % of the total concentration contained in it during the first few 24 hours after its…”

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“…[19,20]) не спричиняють екодеструктивного впливу на довкілля). Окремі розробки щодо запровадження капсульованих органомінеральних добрив пролонгованої дії, що за своєю сутністю є ординарною зеленою інновацією, викладені у роботах [21][22][23][24]. Їх використання дозволить досягти стійкого управління поживними речовинами та кращому використанню азоту та фосфору.…”