Formulation of slow release NPK fertilizer (cellulose-graft-poly(acrylamide)/nano-hydroxyapatite/soluble fertilizer) composite and evaluating its N mineralization potential
Polymer nano-composite fertilizer formulation has the potential to enhance nutrient use efficiency. Slow release fertilizer (SRF) composite was formulated by incorporating nano-hydroxyapatite (nano-HA) and water soluble fertilizers (urea, (NH4)2HPO4 and K2SO4) into water hyacinth cellulose-graft-pol...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2018-12-01
|
| Series: | Annals of Agricultural Sciences |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0570178318300290 |
| _version_ | 1818926667694866432 |
|---|---|
| author | Kiplangat Rop George N. Karuku Damaris Mbui Immaculate Michira Njagi Njomo |
| author_facet | Kiplangat Rop George N. Karuku Damaris Mbui Immaculate Michira Njagi Njomo |
| author_sort | Kiplangat Rop |
| collection | DOAJ |
| description | Polymer nano-composite fertilizer formulation has the potential to enhance nutrient use efficiency. Slow release fertilizer (SRF) composite was formulated by incorporating nano-hydroxyapatite (nano-HA) and water soluble fertilizers (urea, (NH4)2HPO4 and K2SO4) into water hyacinth cellulose-graft-poly(acrylamide) polymer hydrogel. Fourier Transform Infra-red spectra revealed existence of chemical interaction between the monomer, cellulose, urea and nano-HA. The release of nutrients was assessed using laboratory incubation experiment. Significantly higher content of mineral nitrogen (MN) was observed in the first 4 weeks in conventional fertilizer (CF) compared to SRF treatments and the control. MN content in SRF treatments increased considerably between the 8th and 12th week, and declined in the 16th week. The values of potentially mineralizable N estimated using first order kinetics model related well to the observed cumulative MN at 16th week. No significant difference was observed between CF and SRF treatments for available P content in the 2nd week. Significantly higher P content was observed in CF compared to SRF treatment in the 4th week, whereas in the 8th week, some SRFs released significantly higher content than CF. Available P peaked in the 8th week in all the treatments and remained constant at 12th and 16th week. Availability of P in SRFs increased with increased content of soluble P and decreased content of nano-HA. Exchangeable K showed less variation during the incubation period, suggesting short release time. The data revealed reduced chances of leaching losses and toxic effect to the plant roots, as well as synchronized nutrient release and requirement by crops. Keywords: Nano-composite, Polymer hydrogel, Chemical interaction, Incubation experiment, Kinetics model |
| first_indexed | 2024-12-20T03:00:46Z |
| format | Article |
| id | doaj.art-9f7d4a1cdfe340faabc759bf8615ae57 |
| institution | Directory Open Access Journal |
| issn | 0570-1783 |
| language | English |
| last_indexed | 2024-12-20T03:00:46Z |
| publishDate | 2018-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Annals of Agricultural Sciences |
| spelling | doaj.art-9f7d4a1cdfe340faabc759bf8615ae572022-12-21T19:55:46ZengElsevierAnnals of Agricultural Sciences0570-17832018-12-01632163172Formulation of slow release NPK fertilizer (cellulose-graft-poly(acrylamide)/nano-hydroxyapatite/soluble fertilizer) composite and evaluating its N mineralization potentialKiplangat Rop0George N. Karuku1Damaris Mbui2Immaculate Michira3Njagi Njomo4Department of Chemistry, University of Nairobi. P.O. Box 30197-00100, Nairobi, Kenya; Corresponding author.Department of Land Resource Management and Agricultural Technology, University of Nairobi. P.O. Box 29053-00625, Kangemi, Nairobi, KenyaDepartment of Chemistry, University of Nairobi. P.O. Box 30197-00100, Nairobi, KenyaDepartment of Chemistry, University of Nairobi. P.O. Box 30197-00100, Nairobi, KenyaDepartment of Chemistry, University of Nairobi. P.O. Box 30197-00100, Nairobi, KenyaPolymer nano-composite fertilizer formulation has the potential to enhance nutrient use efficiency. Slow release fertilizer (SRF) composite was formulated by incorporating nano-hydroxyapatite (nano-HA) and water soluble fertilizers (urea, (NH4)2HPO4 and K2SO4) into water hyacinth cellulose-graft-poly(acrylamide) polymer hydrogel. Fourier Transform Infra-red spectra revealed existence of chemical interaction between the monomer, cellulose, urea and nano-HA. The release of nutrients was assessed using laboratory incubation experiment. Significantly higher content of mineral nitrogen (MN) was observed in the first 4 weeks in conventional fertilizer (CF) compared to SRF treatments and the control. MN content in SRF treatments increased considerably between the 8th and 12th week, and declined in the 16th week. The values of potentially mineralizable N estimated using first order kinetics model related well to the observed cumulative MN at 16th week. No significant difference was observed between CF and SRF treatments for available P content in the 2nd week. Significantly higher P content was observed in CF compared to SRF treatment in the 4th week, whereas in the 8th week, some SRFs released significantly higher content than CF. Available P peaked in the 8th week in all the treatments and remained constant at 12th and 16th week. Availability of P in SRFs increased with increased content of soluble P and decreased content of nano-HA. Exchangeable K showed less variation during the incubation period, suggesting short release time. The data revealed reduced chances of leaching losses and toxic effect to the plant roots, as well as synchronized nutrient release and requirement by crops. Keywords: Nano-composite, Polymer hydrogel, Chemical interaction, Incubation experiment, Kinetics modelhttp://www.sciencedirect.com/science/article/pii/S0570178318300290 |
| spellingShingle | Kiplangat Rop George N. Karuku Damaris Mbui Immaculate Michira Njagi Njomo Formulation of slow release NPK fertilizer (cellulose-graft-poly(acrylamide)/nano-hydroxyapatite/soluble fertilizer) composite and evaluating its N mineralization potential Annals of Agricultural Sciences |
| title | Formulation of slow release NPK fertilizer (cellulose-graft-poly(acrylamide)/nano-hydroxyapatite/soluble fertilizer) composite and evaluating its N mineralization potential |
| title_full | Formulation of slow release NPK fertilizer (cellulose-graft-poly(acrylamide)/nano-hydroxyapatite/soluble fertilizer) composite and evaluating its N mineralization potential |
| title_fullStr | Formulation of slow release NPK fertilizer (cellulose-graft-poly(acrylamide)/nano-hydroxyapatite/soluble fertilizer) composite and evaluating its N mineralization potential |
| title_full_unstemmed | Formulation of slow release NPK fertilizer (cellulose-graft-poly(acrylamide)/nano-hydroxyapatite/soluble fertilizer) composite and evaluating its N mineralization potential |
| title_short | Formulation of slow release NPK fertilizer (cellulose-graft-poly(acrylamide)/nano-hydroxyapatite/soluble fertilizer) composite and evaluating its N mineralization potential |
| title_sort | formulation of slow release npk fertilizer cellulose graft poly acrylamide nano hydroxyapatite soluble fertilizer composite and evaluating its n mineralization potential |
| url | http://www.sciencedirect.com/science/article/pii/S0570178318300290 |
| work_keys_str_mv | AT kiplangatrop formulationofslowreleasenpkfertilizercellulosegraftpolyacrylamidenanohydroxyapatitesolublefertilizercompositeandevaluatingitsnmineralizationpotential AT georgenkaruku formulationofslowreleasenpkfertilizercellulosegraftpolyacrylamidenanohydroxyapatitesolublefertilizercompositeandevaluatingitsnmineralizationpotential AT damarismbui formulationofslowreleasenpkfertilizercellulosegraftpolyacrylamidenanohydroxyapatitesolublefertilizercompositeandevaluatingitsnmineralizationpotential AT immaculatemichira formulationofslowreleasenpkfertilizercellulosegraftpolyacrylamidenanohydroxyapatitesolublefertilizercompositeandevaluatingitsnmineralizationpotential AT njaginjomo formulationofslowreleasenpkfertilizercellulosegraftpolyacrylamidenanohydroxyapatitesolublefertilizercompositeandevaluatingitsnmineralizationpotential |