scholarly journals Synthesis and Characterization of Controlled-Release Urea Fertilizer from Superabsorbent Hydrogels

2020 ◽  
Vol 20 (3) ◽  
pp. 616
Author(s):  
Salih Muharam ◽  
Afria Fitri ◽  
Lela Mukmilah Yuningsih ◽  
Yulia Mariana Tessa Ayudia Putri ◽  
Isnaini Rahmawati
Keyword(s):  
Controlled Release ◽  
Ph Control ◽  
Superabsorbent Hydrogel ◽  
Urea Fertilizer ◽  
Urea Release ◽  
Controlled Release Urea ◽  
Carboxy Methyl ◽  
Controlled Release Fertilizers ◽  
Superabsorbent Hydrogels

It is very important to develop controlled-release fertilizers to ensure efficiency and environmental protection. This study aims to make a superabsorbent hydrogel-based controlled-release urea fertilizer. Superabsorbent hydrogels were prepared from the cellulose of corn cobs cross-linking with epichlorohydrin, and then an amount of urea as a fertilizer was stored inside the hydrogels (GEL-A). The GEL-A functionalization with carboxy-methyl was also carried out in this study to improve the hydrophilicity of hydrogels (GEL-B). GEL-A and GEL-B were immersed in water at a certain pH and temperature range and the urea concentration released from the hydrogels was monitored by a spectrophotometer. The results showed that the urea released by GEL-A and GEL-B was not much different. Respectively, the urea efficiency of GEL-A and GEL-Bwas around 5.29% and 5.56% for 180 min. The urea released from both hydrogels was not significantly affected by changes in the temperature of the solution. Urea release was influenced by pH, and the rate of urea release of GEL-B was faster than GEL-A, so pH control was needed in the application of this slow-release fertilizer.

Synthesis of Biodegradable Mixing-Polymer as Coating Material for Controlled-Release Urea Fertilizer

2019 ◽  
Vol 1152 ◽  
pp. 43-51 ◽  
Author(s):  
Huu Trung Nguyen ◽  
Van Dat Doan ◽  
Van Dung Trinh
Keyword(s):  
Controlled Release ◽  
Low Cost ◽  
Coating Material ◽  
Urea Fertilizer ◽  
Bonding Structure ◽  
Physico Chemical ◽  
Coating Method ◽  
Urea Release ◽  
Kinetics Of ◽  
Controlled Release Urea

The biodegradable mixing-polymer as low cost, environmentally friendly coating material for controlled-release urea fertilizer was synthesized by borax crosslinked phosphated distarch phosphate (PDSP)/polyvinyl alcohol (PVA) and polyacrylic acid (PAA) via pan coating method. The physico-chemical characteristics of biodegradable mixing-polymer were confirmed by FTIR, TGA and SEM techniques. The kinetics of urea release were also carefully investigated in water and soil. It’s been found that a uniform layer with better bonding structure was created on surface of the mixing-polymer PDSP/PVA-PAA and the time released 70% urea reached 6 hours in water and more than 27 days in soil.

Optimization of Pan Coating Process for Increased Efficiency of Controlled-Release Urea Fertilizer

2021 ◽  
Vol 57 (4) ◽  
pp. 333-342
Author(s):  
Trung Huu Nguyen ◽  
Tran Nguyen Minh An ◽  
Mahboob Alam ◽  
Duc Hoai Tran ◽  
Nghi Tran ◽  
...  
Keyword(s):  
Controlled Release ◽  
Layer Thickness ◽  
Release Time ◽  
Coating Process ◽  
Analysis Method ◽  
Sauter Mean Diameter ◽  
Urea Fertilizer ◽  
The Relationship ◽  
Central Composite ◽  
Controlled Release Urea

The goal of the research is to develop an experimental mathematical model of pan coating process effect on the biodegradable polymer and to determine optimal process parameters. The polymer solution was conducted with phosphated di-starch phosphate, polyvinyl alcohol, and polyacrylic acid and performed as material coating for the controlled-release urea fertilizer. The image analysis method has been used to determine the particle size distribution, Sauter mean diameter of the particle and layer thickness that is novel. The central composite rotatable design has been selected to determine the regression models of the process, which described the relationship between two objective variables as layer thickness, release time with angle of pan, spray flow, and coating time. The statistical analysis results indicate the fitness of model.

Controlled-Release Material for Urea Fertilizer from Polylactic Acid

2008 ◽  
Vol 55-57 ◽  
pp. 897-900 ◽  
Author(s):  
J. Papangkorn ◽  
C. Isaraphan ◽  
S. Phinhongthong ◽  
Mantana Opaprakasit ◽  
Pakorn Opaprakasit
Keyword(s):  
Controlled Release ◽  
Polylactic Acid ◽  
Urea Fertilizer ◽  
Technique Effect ◽  
Preparation Conditions ◽  
Micron Size ◽  
Coated Urea ◽  
Urea Release ◽  
Uv Visible ◽  
Controlled Release System

Urea fertilizer is a major source of nitrogen, which is one of the essential nutrients for plant growth. Due to its uncontrollable release, this chemical can be wasted easily by leaching and volatilization that can adversely cause the contamination to the environment. In this work, a controlled-release material for urea fertilizer has been prepared by using degradable polylactic acid. Unlike other conventional controlled-release system, the resulting material is able to provide an efficient supply of urea fertilizer, without causing further contamination to the environment from residue material, as polylactic acid can be degraded in the environment. Micron-size particles of polylactic acid coated urea were prepared by employing atomizing technique. Effect of the preparation conditions; urea/PLA composition, PLA concentration, and pressure of atomizing gun on the particle size of material are investigated. The urea release rate of these samples is then studied by employing UV-Visible spectrophotometer. In addition, the effect of preparation conditions on shape and morphology of sample is determined by using Scanning Electron Microscope (SEM).

Preparation and characterization of triple polymer-coated controlled-release urea with water-retention property and enhanced durability

2010 ◽  
Vol 120 (4) ◽  
pp. 2103-2111 ◽  
Author(s):  
Shuming Tao ◽  
Jun Liu ◽  
Kemo Jin ◽  
Xiaoyun Qiu ◽  
Yuan Zhang ◽  
...  
Keyword(s):  
Controlled Release ◽  
Water Retention ◽  
Controlled Release Urea

scholarly journals Elaboration and Characterization of Vitreous Fertilizers and Study of Their Impact on the Growth, Photosynthesis, and Yield of Wheat (Triticum durum L.)

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1295
Author(s):  
Tariq Labbilta ◽  
Mohamed Ait-El-Mokhtar ◽  
Younes Abouliatim ◽  
Mehdi Khouloud ◽  
Abdelilah Meddich ◽  
...  
Keyword(s):  
Controlled Release ◽  
Triticum Durum ◽  
Positive Impact ◽  
Glass Structure ◽  
Phosphate Glasses ◽  
Control Treatment ◽  
Potential Alternative ◽  
Nitrogen Phosphorus ◽  
Controlled Release Fertilizers

Four different phosphate glass formulations (F0, F1, F2, and F3) were developed according o wheat nutrient requirements to be used as controlled-release fertilizers. These glasses contain macro-elements (P2O5-K2O-CaO-MgO), with the addition of microelements (Fe-Mn-Zn-B-Cu-Mo) in each formulation. The effects of these elements’ addition on thermal properties, glass structure, and dissolution behaviors were investigated. Results showed that these glasses are composed essentially of metaphosphate chains and that the addition of micronutrients could change the chemical durability of phosphate glasses. A greenhouse experiment was performed using wheat (Triticum durum L.) to evaluate the efficiency of the four glasses, with or without application of chemical nitrogen (N) (N + VF and VF, respectively). The different formulas were tested using two rates of 0.3 and 1 g per plant. In addition to the vitreous fertilizer formulations, two other treatments were applied: control treatment with no amendment and Nitrogen-Phosphorus-Potassium treatment with the application of the conventional fertilizers on the base of optimal rates. After four months of cultivation, vitreous fertilizers application significantly improved growth (7% to 88%), photosynthetic (8% to 49%) parameters, and yield (29% to 33%) compared to NPK treatment and to the control. It has been found that formulas F1, F2, and F3 may constitute a potential alternative to conventional fertilization due to their positive impact on wheat production and can be used in practice as an environmentally controlled-release fertilizer.

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