Creation & Characterization of Different Coated Urea Materials & Their Impact as Controlled Release Fertilizers

2016 ◽  
Vol 7 (10) ◽  
pp. 793-800 ◽  
Author(s):  
G. Taha ◽  
S. Farahat ◽  
E. Elnggar ◽  
M. AL Molakab
Keyword(s):  
Controlled Release ◽  
Coated Urea ◽  
Controlled Release Fertilizers

scholarly journals Preparation and Characterization of Environmentally Friendly Controlled Release Fertilizers Coated by Leftovers-Based Polymer

Processes ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 417 ◽  
Author(s):  
Cong Jia ◽  
Panfang Lu ◽  
Min Zhang
Keyword(s):  
Controlled Release ◽  
Chemical Structure ◽  
Nutrient Release ◽  
Environment Friendly ◽  
Structure Surface ◽  
Agricultural Applications ◽  
Coated Urea ◽  
Microstructure Morphology ◽  
Controlled Release Fertilizers

In this work, a novel bio-based polyurethane (PU) was synthesized by using a leftovers (SF)-based polyol and isocyanate for controlled release fertilizers (CRFs). Its chemical structure, surface elemental compositions and distribution were examined by Fourier transform infrared (FTIR), energy dispersive spectroscopy (EDX) and a multifunctional imaging electron spectrometer (XPS). The microstructure morphology of CRFs were examined by SEM. The nutrient release behaviors of CRFs were observed in water. The results demonstrated that SF-based PU-coated urea (FPU) had a denser structure and better nutrient releasing ability. Findings from this work indicated that the use of SF as a coating material of environment-friendly CRFs had great potential, and would hopefully be used for horticultural and agricultural applications.

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.

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.

scholarly journals Evaluation of Controlled-release Fertilizers for Young Citrus Trees

1991 ◽  
Vol 116 (6) ◽  
pp. 987-990 ◽  
Author(s):  
Mongi Zekri ◽  
Robert C.J. Koo
Keyword(s):  
Controlled Release ◽  
Tree Growth ◽  
Residual Effects ◽  
Mineral Concentration ◽  
Total N ◽  
N Sources ◽  
Valencia Orange ◽  
Coated Urea ◽  
Orange Trees ◽  
Controlled Release Fertilizers

Controlled-release sources of N and K were compared with soluble sources on young `Valencia' orange trees (Citrus sinensis [L.] Osb.). The effects of these fertilizers on leaf mineral concentration, soil chemical analysis, and tree growth were evaluated for 3 years. Soluble fertilizers were generally more readily available but had shorter residual effects on leaves and soil than controlled-release fertilizers. In the top 30 cm of soil, the plots treated with controlled-release N had 23% more total N than those treated with soluble N sources, while the plots fertilized with controlled-release K contained 56% more extractable K than those that received soluble K. Different effects on leaf and soil N between the two controlled-release N sources, sulfur-coated urea (SCU) and methylene urea (MU), were also found. With the use of controlled-release fertilizers, application frequency was reduced from a total of 15 to six applications with no adverse effects on tree growth, leaf mineral composition, or soil fertility during the first 3 years. Combining soluble and controlled-release fertilizers in a plant nutrition program offers an economical and effective strategy for citrus growers.

Sign in / Sign up

Export Citation Format

Share Document