Characterization of p(AA-co-AM)/bent/urea and its swelling and slow release behavior in a simulative soil environment

2015 ◽  
Vol 133 (12) ◽  
pp. n/a-n/a ◽  
Author(s):  
Peng Wen ◽  
Zhansheng Wu ◽  
Yanhui He ◽  
Yajie Han ◽  
Yanbin Tong
Author(s):  
Fartisincha Peingurta Andrew ◽  
Daniel T Gungula ◽  
Semiu A Kareem ◽  
Abdullahi M Saddiq ◽  
Esther F Adebayo ◽  
...  

In this study, a slow-release urea fertilizer hydrogel was synthesized from hydroxyl propyl methyl cellulose, polyvinyl alcohol and glycerol blends with paper (blended paper) as second layer. The fertilizer hydrogel was characterized by SEM, XRD and FTIR. Its retention in sandy soil, swelling behavior in distilled and tap water as well as slow-release behavior to urea were investigated. The results indicated that the fertilizer had good slow-release properties and ability to retain water in soil. However, the addition of blended paper as a second layer matrix was found to help improve the release properties of the fertilizer. The swelling kinetic of the hydrogel followed the Schott’s Second order model. The release kinetics of urea in water was best described by the Zero order model signifying that the release behavior was independent of fertilizer concentration


2015 ◽  
Vol 39 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Luíz Paulo Figueredo Benício ◽  
Rejane Alvarenga Silva ◽  
Júnia Aparecida Lopes ◽  
Denise Eulálio ◽  
Rodrigo Morais Menezes dos Santos ◽  
...  

The current research aims to introduce Layered Double Hydroxides (LDH) as nanomaterials to be used in agriculture, with particular reference to its use as storage and slow release matrix of nutrients and agrochemicals for plant growing. Structural characteristics, main properties, synthesis methods and characterization of LDH were covered in this study. Moreover, some literature data have been reported to demonstrate their potential for storage and slow release of nitrate, phosphate, agrochemicals, besides as being used as adsorbent for the wastewater treatment. This research aims to expand, in near future, the investigation field on these materials, with application in agriculture, increasing the interface between chemistry and agronomy.


2021 ◽  
Vol 889 ◽  
pp. 91-97
Author(s):  
Suntree Sangjan ◽  
Wadchara Thongsamer

A novel slow-release N-fertilizer hydrogel beads were developed using sodium alginate (SA) and alginate-talcum (ST) composite as N-absorbent. In this work, the hydrogel composite were fabricated by simple method and low cost. N-fertilizer hydrogel beads were prepared two types, for SA types, which were different sodium alginate (1(SA1), 3(SA3), 5(SA5), 7(SA7), and 10(SA10) wt%). And, for ST types, sodium alginate and talcum were vary ratios to 1:0.5(S1T0.5), 1:1(S1T1), and 1:2 (S1T2). The chemical structure of hydrogel composite beads were characterized via Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). The release behavior were investigate by Zero-order kinetic model, First-order kinetic model, Higuchi model and Korsmeyer-Peppas model. We have found that the N-fertilizer release constants in Korsmeyer-Peppas model were decrease with increase SA content for 1-5 wt% in SA hydrogel beads. However, SA contents were more than 5 wt% which rapidly enhanced fertilizer release. In addition, to add talcum in ST hydrogel beads significantly reduced fertilizer release rate. The N-fertilizer hydrogel beads exhibits significantly slow release behavior. These results indicates that the development of slow-release fertilizer hydrogel beads can be improve the effectiveness of N-fertilizer.


2017 ◽  
Vol 63 (No. 7) ◽  
pp. 331-338
Author(s):  
Pecháček Jan ◽  
Vavříček Dušan ◽  
Kučera Aleš ◽  
Dundek Peter

The current revitalization of forest ecosystems in the Krušné Hory Mts. is carried out through: (i) spreading line windrows, (ii) chemical amelioration. The aim of this research consisted in: (i) assessing basic pedochemical characteristics of spread windrows, (ii) testing the effect of slow-release fertilizers from the Silvamix<sup>®</sup> series and dolomitic limestone on the root ball zone soil five years after application. The results of this study suggest that spread windrows are a suitable environment for forest species: with the only risk being extremely low P concentrations. Our results further show an increase in the amount of soil macrobioelements in the case of Silvamix<sup>®</sup> R and Silvamix<sup>®</sup> Forte, namely P over 125 and 85%; Mg<sup>2+</sup> over 84 and 108%; base saturation (BS) over 44 and 40.7%, respectively, compared with a control. Having applied dolomitic limestone, an increase of BS (by 88%), Mg<sup>2+</sup> (by 250%) and Ca<sup>2+</sup> (by 37%) was observed; there was a reduction in the level of mobile Al<sup>3+</sup> (by 25%) compared with the control. Stromfolixyl<sup>®</sup> application did not affect the chemistry of the soil environment.


Author(s):  
Jessica Doan ◽  
Peter Phommahaxay ◽  
Sarah Olson ◽  
Matthew A. Petersen

We describe the formulation and manufacture of thermoplastic polyurethane (TPU)-based steroid-eluting components and the development of a versatile, material-agnostic analytical method for their rapid characterization. The impact of materials, formulation, and processing on controlled release behavior was characterized and compared to current industry standard components under physiologically relevant conditions. The combination of factors modulated drug release, offering new avenues for controlling the release of steroids from implantable medical devices.


2020 ◽  
Vol 31 (17) ◽  
pp. 1943-1950
Author(s):  
Noam Zuela-Sopilniak ◽  
Daniel Bar-Sela ◽  
Chayki Charar ◽  
Oren Wintner ◽  
Yosef Gruenbaum ◽  
...  

A mechanical characterization of cell nuclei within living Caenorhabditis elegans nematodes reveals two protective mechanisms: (1) cytoskeletal decoupling of the nucleus at high load and (2) slow release rates of stored mechanical energy. Lamin knockdown softened the nucleus and attenuated deformation recovery, whereas aging increased nucleus stiffness.


2014 ◽  
Vol 931-932 ◽  
pp. 754-757
Author(s):  
Jittrera Buates ◽  
Petchporn Chawakitchareon ◽  
Rewadee Anuwattana

The objective of this research is to study the nutrient release behaviors on slow release fertilizer (Osmocote® N13:P13:K13, 3 month release formulation). The fertilizer was added into distilled water which adjusted pH of 6.5 and 7.5. The nutrient release behaviors were determined by collecting samples every 1 week and analyzed the nutrient contents in samples by scientific methods. As the result, for the total N release behavior, it may be considered that at lower pH condition tended to release more than that at higher one, for the P (shown by P2O5) and K (shown by K2O) release behaviors may be high at high pH condition.


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