Slow-release NPK fertilizer encapsulated by carboxymethyl cellulose-based nanocomposite with the function of water retention in soil

Bioplastic composites based on carboxymethyl cellulose (CMC) and urea have been successfully synthesised at various amount of zeolites. Urea inclusion into the bioplastics was supposed to result in nitrogen slow-release composites. The bioplastic composites were prepared by solvent casting the precursor gel containing 0.5 % (w/w) urea in CMC in the petri dishes. The zeolites content was varied at 0.1, 0.5, 1.0, 2.0, and 3.0 % (w/w to CMC). It showed that the addition of zeolites to the bioplastic composites up to 0.5% increased their tensile strength. More addition of zeolites decreased the strain of the bioplastic composite. It could be due to the formation of hydrogen bonds between CMC and zeolites. The amount of urea absorbed in the bioplastics increased as the amount of zeolites increases. It is possibly to be due to the strong interaction between urea and zeolites. The ammonium ions may interact with interchangeable cations in the zeolite. This interaction will also extend the time for the bioplastics to biodegrade. The presence of zeolites in the CMC polymer chains is useful to give nitrogen slow-release composites.

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Kinetika Slow Release Pupuk Urea Berlapis Chitosan Termodifikasi

EKUILIBRIUM Journal of Chemical Engineering ◽

10.20961/equilibrium.v1i2.40422 ◽

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>

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Effect of Different Monomers on Water Retention Properties of Slow Release Fertilizer Hydrogel

Procedia Engineering ◽

10.1016/j.proeng.2016.06.573 ◽

2016 ◽

Vol 148 ◽

pp. 201-207 ◽

Cited By ~ 13

Author(s):

Nurul Ekmi Rabat ◽

Shahrir Hashim ◽

Rohah Abdul Majid

Keyword(s):

Water Retention ◽

Slow Release ◽

Slow Release Fertilizer ◽

Water Retention Properties

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Slow Release NPK Fertilizer Preparation from Natural Resources

Materials Science Forum ◽

10.4028/www.scientific.net/msf.948.43 ◽

2019 ◽

Vol 948 ◽

pp. 43-48 ◽

Cited By ~ 3

Author(s):

Windia Hanifah ◽

Chandra Wahyu Purnomo ◽

Suryo Purwono

Keyword(s):

Slow Release ◽

Nutrient Content ◽

Release Profile ◽

Chicken Manure ◽

Equal Weight ◽

Nutrient Sources ◽

Slow Release Fertilizer ◽

N Source ◽

Npk Fertilizer ◽

Release Method

Preparation of Natural multi-nutrient Slow Release Fertilizer (NSRF) aims to reduce the environmental burden from some waste and increase the efficiency of fertilizer in releasing nutrient content. In this study,slow-release fertilizer was prepared from all natural components from waste which aredried chicken manure (N source), struvite (P source), and palm empty fruit bunch ash (K source). The equal weight of the three main nutrient sources was used with the addition of starch powder as the binder by 10%, 15% and 20% of the total nutrient mixture. The mixture of all nutrient with binder was granulated using pan granulator. Dried NSRF granule was tested using sand bed release method to observe the release profile of the contained nutrient. Based on the results of a 30-day leaching study, it was found that increasing concentration of binder will reduce the release of the nutrient from NSRF granules.

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

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.117-119.1100 ◽

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.

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Comparison of different slow-release nutrient composites produced to stimulate microorganisms

Ambiente e Agua - An Interdisciplinary Journal of Applied Science ◽

10.4136/ambi-agua.2259 ◽

2018 ◽

Vol 13 (6) ◽

pp. 1

Author(s):

Everton Amazonas Reis ◽

Emelay Pereira Bispo ◽

Maria Helena Miguez Rocha Leão ◽

Selma Gomes Ferreira Leite

Keyword(s):

Carboxymethyl Cellulose ◽

Slow Release ◽

Technological Development ◽

Glucose Consumption ◽

Phosphorus Compounds ◽

Agricultural Product ◽

Nitrogen And Phosphorus ◽

Release Product ◽

P Supply ◽

Bioremediation Processes

Concern for environmental quality has increased in society because industrial and technological development has released high levels of contaminants into the environment, such as hydrocarbons. A technique widely used for bioremediation is biostimulation, which may be enhanced by microencapsulation. This research formulated slow-release nitrogen and phosphorus compounds using different polymer (Alginate/Capsul®, carboxymethyl cellulose) matrices and compared them with the agricultural product Osmocote® and mineral medium Bushnell-Haas as hydrocarbonoclastics biostimulation agents in the environment for pollutant bioremediation. N (nitrogen) and P (phosphorus) were immobilized using lyophilization and ionic gelation techniques. Experiments were conducted using encapsulated material and evaluated for biomass production, glucose consumption as organic carbon source and N and P supply. The immobilized carboxymethyl cellulose compound showed the best results of glycosidic degradation (66.7%) and microbial biostimulation (350 mg L-1 protein) compared to systems containing free nutrients (11.3% and 150 mg L-1 degradation glycosidic and microbial biostimulation, respectively). Thus, this compound is a potential slow release product for bioremediation processes.

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