Preparation and Properties of a Double-Coated Slow-Release and Water-Retention Urea Fertilizer

2006 ◽  
Vol 54 (4) ◽  
pp. 1392-1398 ◽  
Author(s):  
Rui Liang ◽  
Mingzhu Liu
Keyword(s):  
Water Retention ◽  
Slow Release ◽  
Urea Fertilizer

scholarly journals Kinetika Slow Release Pupuk Urea Berlapis Chitosan Termodifikasi

2017 ◽  
Vol 1 (2) ◽  
Author(s):  
YC Danarto ◽  
Anggita Nugrahey ◽  
Sela Murni Noviani
Keyword(s):  
Water Retention ◽  
Slow Release ◽  
Zero Order ◽  
Release Profile ◽  
Nitrogen Release ◽  
Diffusion Kinetic ◽  
Urea Fertilizer ◽  
First Order ◽  
Modified Chitosan ◽  
Urea Content

<p>During this time, the use of urea is not efficient, because about 40-70% of nitrogen in the fertilizer is not absorbed by plants. In order to increase the effectivity of nitrogen release in urea fertilizer, it needs to be coated with modified chitosan as slow releasing agent to form a hydrogel material by forming a cross linking with glutaraldehyde cross-linker.The aims of this research is to study the mechanism and the appropriate kinetic model of nitrogen release in slow releasing fertilizer of modified chitosan. This research was conducted by analyzing the ability of bio-hydrogel by calculating the percentage of swelling ratio and water retention of hydrogel and the nitrogen release in slow releasing fertilizer both in the soil and water. The experiments were conducted by varying the amount of urea used which  30 gram, 40 gram, 50 gram, 60 gram and 70 gram of urea fertilizer. The The release profile is then plotted on several models of diffusion kinetic such as zero order, first order, higuchi and korsmeyer peppas. The appropriate model of diffusion kinetic is chosen by the largest correction factor (R2).The results showed that nitrogen release of the slow releasing fertilizer in the soil with 50% urea content  and  the  water  followed  korsmeyer  peppas  model  with  fickian  mechanism. Nitrogen release in the soil with urea content of 30%, 40%, 60%, and 70% followed the korsmeyer peppas model with nonfickian mechanism.</p>

Potential of Epoxidized Natural Rubber (ENR) as Hydrophobicity Contributor in Chitosan-Urea Fertilizer

2015 ◽  
Vol 761 ◽  
pp. 536-541 ◽  
Author(s):  
Noraiham Mohamad ◽  
Nor Nadiah Abdul Hamid ◽  
Nor Abidah Abdul Aziz ◽  
Jeeferie Abd Razak ◽  
Umar Al Amani Azlan ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Natural Rubber ◽  
Water Retention ◽  
Slow Release ◽  
Compositional Analysis ◽  
Epoxidized Natural Rubber ◽  
Hydrophobic Properties ◽  
Urea Fertilizer ◽  
Slow Release Urea

This study is to investigate the potential of ENR to be incorporated with chitosan for slow release urea fertilizer. In this research, mixture of chitosan and epoxidized natural rubber (ENR) was used as binder to take advantage of their biodegradable and polar characteristics, respectively. The effect of mixing formulation to the properties of fertilizer was studied. Firstly, the chitosan and ENR were diluted in toluene with the presence of bentonite as filler. Then, urea powder was mixed and stirred for 20 minutes before left to dry overnight in an oven at 60°C. Water absorption and water retention analysis were carried out on compressed pellets. The increase of ENR loading was observed to contribute to the increase of hydrophobic properties of the fertilizer. The findings were supported by compositional analysis using Fourier Transform Infrared spectroscopy (FTIR).

Urea fertilizer coated with biodegradable polymers and diatomite for slow release and water retention

2015 ◽  
Vol 12 (6) ◽  
pp. 1085-1094 ◽  
Author(s):  
Jean Felix Mukerabigwi ◽  
Qing Wang ◽  
Xiaoya Ma ◽  
Min Liu ◽  
Shaojun Lei ◽  
...  
Keyword(s):  
Biodegradable Polymers ◽  
Water Retention ◽  
Slow Release ◽  
Urea Fertilizer

scholarly journals Formulation and characterization of water retention and slow-release urea fertilizer based on Borassus aethiopum starch and Maesopsis eminii hydrogels

2021 ◽  
pp. 100223
Author(s):  
Daniel T. Gungula ◽  
Fartisincha P. Andrew ◽  
Japari Joseph ◽  
Semiu A. Kareem ◽  
Jeffery Tsware Barminas ◽  
...  
Keyword(s):  
Water Retention ◽  
Slow Release ◽  
Urea Fertilizer ◽  
Slow Release Urea ◽  
Borassus Aethiopum ◽  
Maesopsis Eminii

Application of Slow-Release Fertilizer with the Function of Water-Absorption and Water-Retention in Position Engineering Camouflage

2011 ◽  
Vol 117-119 ◽  
pp. 1100-1102
Author(s):  
Shao Hong Li ◽  
Yue Guo Shen ◽  
Zhong Feng Shi
Keyword(s):  
Water Absorption ◽  
Water Retention ◽  
Slow Release ◽  
Rock Slopes ◽  
Slow Release Fertilizer ◽  
The Earth ◽  
Earth Slopes

The construction of position engineering causes a lot of naked earth slopes and rock slopes. Because the earth and rock lack of water absorption and water retention, traditional vegetation camouflage can not make it. The slow-release fertilizer with the function of water-absorption and water-retention make up it and which will be applied widely in vegetation camouflage of position engineering.

An Eco-Friendly Slow-Release Urea Fertilizer Based on Waste Mulberry Branches for Potential Agriculture and Horticulture Applications

2014 ◽  
Vol 2 (7) ◽  
pp. 1871-1878 ◽  
Author(s):  
Yong Zhang ◽  
Xiying Liang ◽  
Xiaogang Yang ◽  
Hongyi Liu ◽  
Juming Yao
Keyword(s):  
Slow Release ◽  
Urea Fertilizer ◽  
Slow Release Urea

scholarly journals Characterization of Alginate-Cellulose-Kaolin Composites for Slow-Release Urea Fertilizer

2021 ◽  
Vol 8 (3) ◽  
pp. 219-227
Author(s):  
Sunardi Sunardi ◽  
Gusti Nia Faramitha ◽  
Uripto Trisno Santoso
Keyword(s):  
Slow Release ◽  
Aqueous Media ◽  
Entrapment Efficiency ◽  
Swelling Ratio ◽  
Release Agent ◽  
Urea Fertilizer ◽  
Wet Condition ◽  
Slow Release Urea ◽  
Cie Lab

Research on the effect of cellulose and kaolin addition to alginate-cellulose-kaolin composites' characteristics as a slow-release agent of urea fertilizer has been done. The technique used in composites' preparation is an extrusion technique using 2% CaCl2 solution as a cross-linker. The compositions of alginate-cellulose-kaolin were varied to determine their effect on composites' characteristics such as diameter, color, swelling ratio, entrapment efficiency, and release of urea. The results showed that the diameter of beads in wet condition produced ranges from 2.98 to 3.54 mm, whereas the diameter of dry beads ranges from 1.22 to 1.92 mm. The addition of cellulose and kaolin affected the color of the beads produced based on CIE Lab analysis. The value of the swelling ratio decreased with the addition of cellulose and kaolin. The entrapment efficiency of urea in beads obtained ranged from 37.25 to 45.06%. The release of urea in aqueous media showed that cellulose and kaolin's addition into the alginate affected the amount of released urea.

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