Temat: nutrients release - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Innovative NPK Fertilizers based on Polyacrylamide and Polyvinyl Alcohol with Controlled Release of Nutrients
Autorzy:: Białkowska, Anita
Borycka, Bożena
Bakar, Mohamed
Rzany, Agnieszka
Tematy:: polyacrylamide
fertilizers
polyvinyl alcohol
nutrients release; Pokaż więcej
Data publikacji:: 2022
Powiązania:: https://bibliotekanauki.pl/articles/2174821.pdf Link otwiera się w nowym oknie
Źródło:: Polish Journal of Chemical Technology; 2022, 24, 3; 14--18
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Opis:: The aim of the present work was the preparation and properties evaluation of two innovative fertilizers based on multicomponent polymers characterized by a controlled release of nutrients. One method was based on a multi-component liquid containing different amounts of microelements NPK 12-5-6 fertilizers with polyacrylamide hydrogel beads. The second method concerned the cross-linking of biodegradable polyvinyl alcohol with multi-component NPK fertilizers. Polyacrylamide-based compositions with the highest amount of NPK salts as well as polyvinyl alcohol-based fertilizers in dense gel form, based on 60 phr crosslinking concentrate have shown optimal properties. Regardless of the type of fertilizers used, their components were released slowly. The obtained fertilizers were classifi ed according to the kinetics of nutrient release. Fertilizers made from polyacrylamide based fertilizers have been classifi ed into a group of controlled release fertilizers (CRF), while those made from biodegradable environmentally friendly polyvinyl alcohol have been defi ned as slow released fertilizers (SRF).
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Release of selected nutrients from polymer-coated fertilisers in the soil environment
Autorzy:: Włodarczyk, Małgorzata
Siwek, Hanna
Lubkowski, Krzysztof
Buchwał, Anna
Tematy:: biodegradable polymer-coated fertiliser
diffusion coefficient
nutrients
release kinetics
soil leachate; Pokaż więcej
Data publikacji:: 2024
Powiązania:: https://bibliotekanauki.pl/articles/58907020.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Water and Land Development; 2024, 62; 201-211
1429-7426
2083-4535
Pojawia się w:: Journal of Water and Land Development
Opis:: The aim of the study was to evaluate the release of NH4-N and PO4-P from polymer-coated fertilisers in the soil environment, and to analyse their impact on pH and conductivity of the soil leachates. In this investigation mineral NPK(S) 6-20-30(7) fertiliser (as a starting material), commercial, controlled-release OsmocoteTM fertiliser (as a reference material) and four polymer-coated fertilisers have been used. Biodegradable polybutylene(succinate-co-dilinoleate), polyethylene(succinate-co-terepftalate) and chitosan have been used as coating materials. The experiments were conducted in the laboratory conditions, in PVC columns filled with air-dry soil. The nutrients release from the investigated materials was explained based on the diffusion mechanism and it was interpreted with the use of the Korsmeyer-Peppas kinetic model. Two mechanisms dominate in the release process of nutrients: the mechanism based on quasi-Fickian diffusion and non-Fickian (anomalous case) mechanism. The largest changes of pH and electrical conductivity (EC) of soil leachates occurred in the initial period of research for all tested fertilisers (pH: 9.5-20.3% - loamy sand (S1) 7.9-20.6% – sandy loam (S2); EC: 438-1667% - S1, 771-1509% - S2). The polymer coating significantly reduces the nutrient release from the fertiliser core. The size of these changes depends on the type and thickness of the polymer layer and the physicochemical properties of the soils.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Dynamic of Components Leachate from Experimental Fertilizers in Leaching Test
Autorzy:: Ciesielczuk, T.
Poluszyńska, J.
Szewczyk, A.
Rosik-Dulewska, C.
Sporek, M.
Tematy:: nutrients
leaching
slow-release fertilisers
solvent extraction spent coffee grounds
sustainable fertilisation; Pokaż więcej
Data publikacji:: 2018
Powiązania:: https://bibliotekanauki.pl/articles/124470.pdf Link otwiera się w nowym oknie
Źródło:: Journal of Ecological Engineering; 2018, 19, 2; 194-203
2299-8993
Pojawia się w:: Journal of Ecological Engineering
Opis:: Organic matter contained in the waste of food industry or occurring in the households, in the absence of contamination with other kind of waste, may be used to create a “fertiliser”, which could be even reused in the organic production of arable crops. Particular attention is drawn to the fertilisers which may be applied in the case of amateur cultivation of pot plants and in the allotment gardens. The paper presents the results of research regarding the dynamics of the release of nutrients from tablets created with the help of encapsulation of the mixture manufactured from solvent extraction waste of coffee (SCG), modified by the ash obtained from low temperature burning of biomass. In this study, the mixture was determined as a fertilizer. Collagen, polyvinyl acetate, polyvinyl alcohol, shellac as well as sodium water glass have been applied as testing membranes in order to slow down the elution of the components from a fertilizer into solution. The durability tests have been carried out according to PN-EN-13266 standard over 118 days at the temperature of 25°C. The obtained results indicate significant differentiation with regard to the leaching of nutrients and organic matter from the tablets depending on the applied membrane. Strong inhibition concerning leaching of the components through membranes and from shellac and polyvinyl acetate has been observed. The remaining membranes did not inhibit the leaching of nutrients in the long-lasting manner; however, even they may be applied in the agricultural practice.
Dostawca treści:: Biblioteka Nauki

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