Simulation of Nitrogen Release from Chitosan/Local Organic Fertilizer Composite as Slow-Release Fertilizer
The application of conventional fertilizer, especially for inorganic fertilizer, has low efficiency due to the fast release of its nutrients into the environment. Also, it has a high operating cost caused by multiple fertilization processes in one of the planting periods. One of the possibilities to...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Alit Istiani [verfasserIn] Yuni Kusumastuti [verfasserIn] Rochmadi rochmadi [verfasserIn] |
|---|
| Format: |
E-Artikel |
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| Sprache: |
Englisch ; Indonesisch |
| Erschienen: |
2020 |
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| Schlagwörter: |
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| Übergeordnetes Werk: |
In: Jurnal Rekayasa Proses - Universitas Gadjah Mada, 2020, 14(2020), 2, Seite 189-197 |
|---|---|
| Übergeordnetes Werk: |
volume:14 ; year:2020 ; number:2 ; pages:189-197 |
| Links: |
Link aufrufen |
|---|
| DOI / URN: |
10.22146/jrekpros.50341 |
|---|
| Katalog-ID: |
DOAJ051891085 |
|---|
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| 520 | |a The application of conventional fertilizer, especially for inorganic fertilizer, has low efficiency due to the fast release of its nutrients into the environment. Also, it has a high operating cost caused by multiple fertilization processes in one of the planting periods. One of the possibilities to overcome this limitation is applying organic fertilizer as a slow-release fertilizer (SRF). The objective of this research is to prepare SRF by modifying the formulation of local organic fertilizer with chitosan as a binder. The rate of the nitrogen release was studied and simulated with MATLAB. The result shows that the nitrogen loss by water leaching decreased up to 85% in chitosan/organic fertilizer rather than the fertilizer without chitosan. By MATLAB simulation, the release of nitrogen has followed the proposed mathematical model in which the mass transfer occurred dominated by diffusion mechanism with the diffusivity coefficient of 1.61x10-5 cm2/s. Keywords: chitosan; organic fertilizer; slow-release fertilizer A B S T R A K Penggunaan pupuk anorganik masih memiliki efisiensi rendah yang disebabkan oleh cepatnya pelepasan nutrisi pupuk ke lingkungan sehingga nutrisi tersebut tidak dapat terserap baik oleh tanaman. Selain itu, aplikasi pupuk anorganik yang berulang dalam satu periode tanam berdampak pada peningkatan biaya operasional. Salah satu metode untuk mengatasi permasalahan tersebut adalah dengan menggunakan pupuk lepas lambat (slow-release fertilizer) atau dengan menggunakan pupuk organik. Tujuan pada penelitian ini adalah dengan mengombinasikan dua metode tersebut yaitu dengan memodifikasi formulasi dari pupuk organik lokal dengan penambahan kitosan sehingga dapat diperoleh pupuk organik yang memiliki sifat lepas lambat. Laju pelepasan nitrogen dari pupuk yang dihasilkan kemudian dianalisis dan disimulasikan dengan software MATLAB. Hasil penelitian menunjukkan bahwa nitrogen yang hilang pada komposit pupuk organik-kitosan melalui water leaching menurun hingga 85% jika dibandingkan dengan komposit pupuk organik tanpa kitosan. Hasil simulasi MATLAB juga menunjukkan bahwa laju pelepasan nitrogen pada pupuk mengikuti model matematika yang diusulkan yaitu dengan mekanisme difusi, nilai koefisien difusivitas yang diperoleh adalah sebesar 1,61×10-5 cm2/s. Kata kunci: kitosan; pupuk lepas lambat; pupuk organik | ||
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10.22146/jrekpros.50341 doi (DE-627)DOAJ051891085 (DE-599)DOAJ021677c063454ff3b6bd8553b857237f DE-627 ger DE-627 rakwb eng ind TP1-1185 Alit Istiani verfasserin aut Simulation of Nitrogen Release from Chitosan/Local Organic Fertilizer Composite as Slow-Release Fertilizer 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The application of conventional fertilizer, especially for inorganic fertilizer, has low efficiency due to the fast release of its nutrients into the environment. Also, it has a high operating cost caused by multiple fertilization processes in one of the planting periods. One of the possibilities to overcome this limitation is applying organic fertilizer as a slow-release fertilizer (SRF). The objective of this research is to prepare SRF by modifying the formulation of local organic fertilizer with chitosan as a binder. The rate of the nitrogen release was studied and simulated with MATLAB. The result shows that the nitrogen loss by water leaching decreased up to 85% in chitosan/organic fertilizer rather than the fertilizer without chitosan. By MATLAB simulation, the release of nitrogen has followed the proposed mathematical model in which the mass transfer occurred dominated by diffusion mechanism with the diffusivity coefficient of 1.61x10-5 cm2/s. Keywords: chitosan; organic fertilizer; slow-release fertilizer A B S T R A K Penggunaan pupuk anorganik masih memiliki efisiensi rendah yang disebabkan oleh cepatnya pelepasan nutrisi pupuk ke lingkungan sehingga nutrisi tersebut tidak dapat terserap baik oleh tanaman. Selain itu, aplikasi pupuk anorganik yang berulang dalam satu periode tanam berdampak pada peningkatan biaya operasional. Salah satu metode untuk mengatasi permasalahan tersebut adalah dengan menggunakan pupuk lepas lambat (slow-release fertilizer) atau dengan menggunakan pupuk organik. Tujuan pada penelitian ini adalah dengan mengombinasikan dua metode tersebut yaitu dengan memodifikasi formulasi dari pupuk organik lokal dengan penambahan kitosan sehingga dapat diperoleh pupuk organik yang memiliki sifat lepas lambat. Laju pelepasan nitrogen dari pupuk yang dihasilkan kemudian dianalisis dan disimulasikan dengan software MATLAB. Hasil penelitian menunjukkan bahwa nitrogen yang hilang pada komposit pupuk organik-kitosan melalui water leaching menurun hingga 85% jika dibandingkan dengan komposit pupuk organik tanpa kitosan. Hasil simulasi MATLAB juga menunjukkan bahwa laju pelepasan nitrogen pada pupuk mengikuti model matematika yang diusulkan yaitu dengan mekanisme difusi, nilai koefisien difusivitas yang diperoleh adalah sebesar 1,61×10-5 cm2/s. Kata kunci: kitosan; pupuk lepas lambat; pupuk organik chitosan organic fertilizer slow-release fertilizer Chemical technology Yuni Kusumastuti verfasserin aut Rochmadi rochmadi verfasserin aut In Jurnal Rekayasa Proses Universitas Gadjah Mada, 2020 14(2020), 2, Seite 189-197 (DE-627)1760614939 25491490 nnns volume:14 year:2020 number:2 pages:189-197 https://doi.org/10.22146/jrekpros.50341 kostenfrei https://doaj.org/article/021677c063454ff3b6bd8553b857237f kostenfrei https://jurnal.ugm.ac.id/jrekpros/article/view/50341 kostenfrei https://doaj.org/toc/1978-287X Journal toc kostenfrei https://doaj.org/toc/2549-1490 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA AR 14 2020 2 189-197 |
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10.22146/jrekpros.50341 doi (DE-627)DOAJ051891085 (DE-599)DOAJ021677c063454ff3b6bd8553b857237f DE-627 ger DE-627 rakwb eng ind TP1-1185 Alit Istiani verfasserin aut Simulation of Nitrogen Release from Chitosan/Local Organic Fertilizer Composite as Slow-Release Fertilizer 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The application of conventional fertilizer, especially for inorganic fertilizer, has low efficiency due to the fast release of its nutrients into the environment. Also, it has a high operating cost caused by multiple fertilization processes in one of the planting periods. One of the possibilities to overcome this limitation is applying organic fertilizer as a slow-release fertilizer (SRF). The objective of this research is to prepare SRF by modifying the formulation of local organic fertilizer with chitosan as a binder. The rate of the nitrogen release was studied and simulated with MATLAB. The result shows that the nitrogen loss by water leaching decreased up to 85% in chitosan/organic fertilizer rather than the fertilizer without chitosan. By MATLAB simulation, the release of nitrogen has followed the proposed mathematical model in which the mass transfer occurred dominated by diffusion mechanism with the diffusivity coefficient of 1.61x10-5 cm2/s. Keywords: chitosan; organic fertilizer; slow-release fertilizer A B S T R A K Penggunaan pupuk anorganik masih memiliki efisiensi rendah yang disebabkan oleh cepatnya pelepasan nutrisi pupuk ke lingkungan sehingga nutrisi tersebut tidak dapat terserap baik oleh tanaman. Selain itu, aplikasi pupuk anorganik yang berulang dalam satu periode tanam berdampak pada peningkatan biaya operasional. Salah satu metode untuk mengatasi permasalahan tersebut adalah dengan menggunakan pupuk lepas lambat (slow-release fertilizer) atau dengan menggunakan pupuk organik. Tujuan pada penelitian ini adalah dengan mengombinasikan dua metode tersebut yaitu dengan memodifikasi formulasi dari pupuk organik lokal dengan penambahan kitosan sehingga dapat diperoleh pupuk organik yang memiliki sifat lepas lambat. Laju pelepasan nitrogen dari pupuk yang dihasilkan kemudian dianalisis dan disimulasikan dengan software MATLAB. Hasil penelitian menunjukkan bahwa nitrogen yang hilang pada komposit pupuk organik-kitosan melalui water leaching menurun hingga 85% jika dibandingkan dengan komposit pupuk organik tanpa kitosan. Hasil simulasi MATLAB juga menunjukkan bahwa laju pelepasan nitrogen pada pupuk mengikuti model matematika yang diusulkan yaitu dengan mekanisme difusi, nilai koefisien difusivitas yang diperoleh adalah sebesar 1,61×10-5 cm2/s. Kata kunci: kitosan; pupuk lepas lambat; pupuk organik chitosan organic fertilizer slow-release fertilizer Chemical technology Yuni Kusumastuti verfasserin aut Rochmadi rochmadi verfasserin aut In Jurnal Rekayasa Proses Universitas Gadjah Mada, 2020 14(2020), 2, Seite 189-197 (DE-627)1760614939 25491490 nnns volume:14 year:2020 number:2 pages:189-197 https://doi.org/10.22146/jrekpros.50341 kostenfrei https://doaj.org/article/021677c063454ff3b6bd8553b857237f kostenfrei https://jurnal.ugm.ac.id/jrekpros/article/view/50341 kostenfrei https://doaj.org/toc/1978-287X Journal toc kostenfrei https://doaj.org/toc/2549-1490 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA AR 14 2020 2 189-197 |
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10.22146/jrekpros.50341 doi (DE-627)DOAJ051891085 (DE-599)DOAJ021677c063454ff3b6bd8553b857237f DE-627 ger DE-627 rakwb eng ind TP1-1185 Alit Istiani verfasserin aut Simulation of Nitrogen Release from Chitosan/Local Organic Fertilizer Composite as Slow-Release Fertilizer 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The application of conventional fertilizer, especially for inorganic fertilizer, has low efficiency due to the fast release of its nutrients into the environment. Also, it has a high operating cost caused by multiple fertilization processes in one of the planting periods. One of the possibilities to overcome this limitation is applying organic fertilizer as a slow-release fertilizer (SRF). The objective of this research is to prepare SRF by modifying the formulation of local organic fertilizer with chitosan as a binder. The rate of the nitrogen release was studied and simulated with MATLAB. The result shows that the nitrogen loss by water leaching decreased up to 85% in chitosan/organic fertilizer rather than the fertilizer without chitosan. By MATLAB simulation, the release of nitrogen has followed the proposed mathematical model in which the mass transfer occurred dominated by diffusion mechanism with the diffusivity coefficient of 1.61x10-5 cm2/s. Keywords: chitosan; organic fertilizer; slow-release fertilizer A B S T R A K Penggunaan pupuk anorganik masih memiliki efisiensi rendah yang disebabkan oleh cepatnya pelepasan nutrisi pupuk ke lingkungan sehingga nutrisi tersebut tidak dapat terserap baik oleh tanaman. Selain itu, aplikasi pupuk anorganik yang berulang dalam satu periode tanam berdampak pada peningkatan biaya operasional. Salah satu metode untuk mengatasi permasalahan tersebut adalah dengan menggunakan pupuk lepas lambat (slow-release fertilizer) atau dengan menggunakan pupuk organik. Tujuan pada penelitian ini adalah dengan mengombinasikan dua metode tersebut yaitu dengan memodifikasi formulasi dari pupuk organik lokal dengan penambahan kitosan sehingga dapat diperoleh pupuk organik yang memiliki sifat lepas lambat. Laju pelepasan nitrogen dari pupuk yang dihasilkan kemudian dianalisis dan disimulasikan dengan software MATLAB. Hasil penelitian menunjukkan bahwa nitrogen yang hilang pada komposit pupuk organik-kitosan melalui water leaching menurun hingga 85% jika dibandingkan dengan komposit pupuk organik tanpa kitosan. Hasil simulasi MATLAB juga menunjukkan bahwa laju pelepasan nitrogen pada pupuk mengikuti model matematika yang diusulkan yaitu dengan mekanisme difusi, nilai koefisien difusivitas yang diperoleh adalah sebesar 1,61×10-5 cm2/s. Kata kunci: kitosan; pupuk lepas lambat; pupuk organik chitosan organic fertilizer slow-release fertilizer Chemical technology Yuni Kusumastuti verfasserin aut Rochmadi rochmadi verfasserin aut In Jurnal Rekayasa Proses Universitas Gadjah Mada, 2020 14(2020), 2, Seite 189-197 (DE-627)1760614939 25491490 nnns volume:14 year:2020 number:2 pages:189-197 https://doi.org/10.22146/jrekpros.50341 kostenfrei https://doaj.org/article/021677c063454ff3b6bd8553b857237f kostenfrei https://jurnal.ugm.ac.id/jrekpros/article/view/50341 kostenfrei https://doaj.org/toc/1978-287X Journal toc kostenfrei https://doaj.org/toc/2549-1490 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA AR 14 2020 2 189-197 |
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10.22146/jrekpros.50341 doi (DE-627)DOAJ051891085 (DE-599)DOAJ021677c063454ff3b6bd8553b857237f DE-627 ger DE-627 rakwb eng ind TP1-1185 Alit Istiani verfasserin aut Simulation of Nitrogen Release from Chitosan/Local Organic Fertilizer Composite as Slow-Release Fertilizer 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The application of conventional fertilizer, especially for inorganic fertilizer, has low efficiency due to the fast release of its nutrients into the environment. Also, it has a high operating cost caused by multiple fertilization processes in one of the planting periods. One of the possibilities to overcome this limitation is applying organic fertilizer as a slow-release fertilizer (SRF). The objective of this research is to prepare SRF by modifying the formulation of local organic fertilizer with chitosan as a binder. The rate of the nitrogen release was studied and simulated with MATLAB. The result shows that the nitrogen loss by water leaching decreased up to 85% in chitosan/organic fertilizer rather than the fertilizer without chitosan. By MATLAB simulation, the release of nitrogen has followed the proposed mathematical model in which the mass transfer occurred dominated by diffusion mechanism with the diffusivity coefficient of 1.61x10-5 cm2/s. Keywords: chitosan; organic fertilizer; slow-release fertilizer A B S T R A K Penggunaan pupuk anorganik masih memiliki efisiensi rendah yang disebabkan oleh cepatnya pelepasan nutrisi pupuk ke lingkungan sehingga nutrisi tersebut tidak dapat terserap baik oleh tanaman. Selain itu, aplikasi pupuk anorganik yang berulang dalam satu periode tanam berdampak pada peningkatan biaya operasional. Salah satu metode untuk mengatasi permasalahan tersebut adalah dengan menggunakan pupuk lepas lambat (slow-release fertilizer) atau dengan menggunakan pupuk organik. Tujuan pada penelitian ini adalah dengan mengombinasikan dua metode tersebut yaitu dengan memodifikasi formulasi dari pupuk organik lokal dengan penambahan kitosan sehingga dapat diperoleh pupuk organik yang memiliki sifat lepas lambat. Laju pelepasan nitrogen dari pupuk yang dihasilkan kemudian dianalisis dan disimulasikan dengan software MATLAB. Hasil penelitian menunjukkan bahwa nitrogen yang hilang pada komposit pupuk organik-kitosan melalui water leaching menurun hingga 85% jika dibandingkan dengan komposit pupuk organik tanpa kitosan. Hasil simulasi MATLAB juga menunjukkan bahwa laju pelepasan nitrogen pada pupuk mengikuti model matematika yang diusulkan yaitu dengan mekanisme difusi, nilai koefisien difusivitas yang diperoleh adalah sebesar 1,61×10-5 cm2/s. Kata kunci: kitosan; pupuk lepas lambat; pupuk organik chitosan organic fertilizer slow-release fertilizer Chemical technology Yuni Kusumastuti verfasserin aut Rochmadi rochmadi verfasserin aut In Jurnal Rekayasa Proses Universitas Gadjah Mada, 2020 14(2020), 2, Seite 189-197 (DE-627)1760614939 25491490 nnns volume:14 year:2020 number:2 pages:189-197 https://doi.org/10.22146/jrekpros.50341 kostenfrei https://doaj.org/article/021677c063454ff3b6bd8553b857237f kostenfrei https://jurnal.ugm.ac.id/jrekpros/article/view/50341 kostenfrei https://doaj.org/toc/1978-287X Journal toc kostenfrei https://doaj.org/toc/2549-1490 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA AR 14 2020 2 189-197 |
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10.22146/jrekpros.50341 doi (DE-627)DOAJ051891085 (DE-599)DOAJ021677c063454ff3b6bd8553b857237f DE-627 ger DE-627 rakwb eng ind TP1-1185 Alit Istiani verfasserin aut Simulation of Nitrogen Release from Chitosan/Local Organic Fertilizer Composite as Slow-Release Fertilizer 2020 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier The application of conventional fertilizer, especially for inorganic fertilizer, has low efficiency due to the fast release of its nutrients into the environment. Also, it has a high operating cost caused by multiple fertilization processes in one of the planting periods. One of the possibilities to overcome this limitation is applying organic fertilizer as a slow-release fertilizer (SRF). The objective of this research is to prepare SRF by modifying the formulation of local organic fertilizer with chitosan as a binder. The rate of the nitrogen release was studied and simulated with MATLAB. The result shows that the nitrogen loss by water leaching decreased up to 85% in chitosan/organic fertilizer rather than the fertilizer without chitosan. By MATLAB simulation, the release of nitrogen has followed the proposed mathematical model in which the mass transfer occurred dominated by diffusion mechanism with the diffusivity coefficient of 1.61x10-5 cm2/s. Keywords: chitosan; organic fertilizer; slow-release fertilizer A B S T R A K Penggunaan pupuk anorganik masih memiliki efisiensi rendah yang disebabkan oleh cepatnya pelepasan nutrisi pupuk ke lingkungan sehingga nutrisi tersebut tidak dapat terserap baik oleh tanaman. Selain itu, aplikasi pupuk anorganik yang berulang dalam satu periode tanam berdampak pada peningkatan biaya operasional. Salah satu metode untuk mengatasi permasalahan tersebut adalah dengan menggunakan pupuk lepas lambat (slow-release fertilizer) atau dengan menggunakan pupuk organik. Tujuan pada penelitian ini adalah dengan mengombinasikan dua metode tersebut yaitu dengan memodifikasi formulasi dari pupuk organik lokal dengan penambahan kitosan sehingga dapat diperoleh pupuk organik yang memiliki sifat lepas lambat. Laju pelepasan nitrogen dari pupuk yang dihasilkan kemudian dianalisis dan disimulasikan dengan software MATLAB. Hasil penelitian menunjukkan bahwa nitrogen yang hilang pada komposit pupuk organik-kitosan melalui water leaching menurun hingga 85% jika dibandingkan dengan komposit pupuk organik tanpa kitosan. Hasil simulasi MATLAB juga menunjukkan bahwa laju pelepasan nitrogen pada pupuk mengikuti model matematika yang diusulkan yaitu dengan mekanisme difusi, nilai koefisien difusivitas yang diperoleh adalah sebesar 1,61×10-5 cm2/s. Kata kunci: kitosan; pupuk lepas lambat; pupuk organik chitosan organic fertilizer slow-release fertilizer Chemical technology Yuni Kusumastuti verfasserin aut Rochmadi rochmadi verfasserin aut In Jurnal Rekayasa Proses Universitas Gadjah Mada, 2020 14(2020), 2, Seite 189-197 (DE-627)1760614939 25491490 nnns volume:14 year:2020 number:2 pages:189-197 https://doi.org/10.22146/jrekpros.50341 kostenfrei https://doaj.org/article/021677c063454ff3b6bd8553b857237f kostenfrei https://jurnal.ugm.ac.id/jrekpros/article/view/50341 kostenfrei https://doaj.org/toc/1978-287X Journal toc kostenfrei https://doaj.org/toc/2549-1490 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA AR 14 2020 2 189-197 |
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simulation of nitrogen release from chitosan/local organic fertilizer composite as slow-release fertilizer |
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Simulation of Nitrogen Release from Chitosan/Local Organic Fertilizer Composite as Slow-Release Fertilizer |
| abstract |
The application of conventional fertilizer, especially for inorganic fertilizer, has low efficiency due to the fast release of its nutrients into the environment. Also, it has a high operating cost caused by multiple fertilization processes in one of the planting periods. One of the possibilities to overcome this limitation is applying organic fertilizer as a slow-release fertilizer (SRF). The objective of this research is to prepare SRF by modifying the formulation of local organic fertilizer with chitosan as a binder. The rate of the nitrogen release was studied and simulated with MATLAB. The result shows that the nitrogen loss by water leaching decreased up to 85% in chitosan/organic fertilizer rather than the fertilizer without chitosan. By MATLAB simulation, the release of nitrogen has followed the proposed mathematical model in which the mass transfer occurred dominated by diffusion mechanism with the diffusivity coefficient of 1.61x10-5 cm2/s. Keywords: chitosan; organic fertilizer; slow-release fertilizer A B S T R A K Penggunaan pupuk anorganik masih memiliki efisiensi rendah yang disebabkan oleh cepatnya pelepasan nutrisi pupuk ke lingkungan sehingga nutrisi tersebut tidak dapat terserap baik oleh tanaman. Selain itu, aplikasi pupuk anorganik yang berulang dalam satu periode tanam berdampak pada peningkatan biaya operasional. Salah satu metode untuk mengatasi permasalahan tersebut adalah dengan menggunakan pupuk lepas lambat (slow-release fertilizer) atau dengan menggunakan pupuk organik. Tujuan pada penelitian ini adalah dengan mengombinasikan dua metode tersebut yaitu dengan memodifikasi formulasi dari pupuk organik lokal dengan penambahan kitosan sehingga dapat diperoleh pupuk organik yang memiliki sifat lepas lambat. Laju pelepasan nitrogen dari pupuk yang dihasilkan kemudian dianalisis dan disimulasikan dengan software MATLAB. Hasil penelitian menunjukkan bahwa nitrogen yang hilang pada komposit pupuk organik-kitosan melalui water leaching menurun hingga 85% jika dibandingkan dengan komposit pupuk organik tanpa kitosan. Hasil simulasi MATLAB juga menunjukkan bahwa laju pelepasan nitrogen pada pupuk mengikuti model matematika yang diusulkan yaitu dengan mekanisme difusi, nilai koefisien difusivitas yang diperoleh adalah sebesar 1,61×10-5 cm2/s. Kata kunci: kitosan; pupuk lepas lambat; pupuk organik |
| abstractGer |
The application of conventional fertilizer, especially for inorganic fertilizer, has low efficiency due to the fast release of its nutrients into the environment. Also, it has a high operating cost caused by multiple fertilization processes in one of the planting periods. One of the possibilities to overcome this limitation is applying organic fertilizer as a slow-release fertilizer (SRF). The objective of this research is to prepare SRF by modifying the formulation of local organic fertilizer with chitosan as a binder. The rate of the nitrogen release was studied and simulated with MATLAB. The result shows that the nitrogen loss by water leaching decreased up to 85% in chitosan/organic fertilizer rather than the fertilizer without chitosan. By MATLAB simulation, the release of nitrogen has followed the proposed mathematical model in which the mass transfer occurred dominated by diffusion mechanism with the diffusivity coefficient of 1.61x10-5 cm2/s. Keywords: chitosan; organic fertilizer; slow-release fertilizer A B S T R A K Penggunaan pupuk anorganik masih memiliki efisiensi rendah yang disebabkan oleh cepatnya pelepasan nutrisi pupuk ke lingkungan sehingga nutrisi tersebut tidak dapat terserap baik oleh tanaman. Selain itu, aplikasi pupuk anorganik yang berulang dalam satu periode tanam berdampak pada peningkatan biaya operasional. Salah satu metode untuk mengatasi permasalahan tersebut adalah dengan menggunakan pupuk lepas lambat (slow-release fertilizer) atau dengan menggunakan pupuk organik. Tujuan pada penelitian ini adalah dengan mengombinasikan dua metode tersebut yaitu dengan memodifikasi formulasi dari pupuk organik lokal dengan penambahan kitosan sehingga dapat diperoleh pupuk organik yang memiliki sifat lepas lambat. Laju pelepasan nitrogen dari pupuk yang dihasilkan kemudian dianalisis dan disimulasikan dengan software MATLAB. Hasil penelitian menunjukkan bahwa nitrogen yang hilang pada komposit pupuk organik-kitosan melalui water leaching menurun hingga 85% jika dibandingkan dengan komposit pupuk organik tanpa kitosan. Hasil simulasi MATLAB juga menunjukkan bahwa laju pelepasan nitrogen pada pupuk mengikuti model matematika yang diusulkan yaitu dengan mekanisme difusi, nilai koefisien difusivitas yang diperoleh adalah sebesar 1,61×10-5 cm2/s. Kata kunci: kitosan; pupuk lepas lambat; pupuk organik |
| abstract_unstemmed |
The application of conventional fertilizer, especially for inorganic fertilizer, has low efficiency due to the fast release of its nutrients into the environment. Also, it has a high operating cost caused by multiple fertilization processes in one of the planting periods. One of the possibilities to overcome this limitation is applying organic fertilizer as a slow-release fertilizer (SRF). The objective of this research is to prepare SRF by modifying the formulation of local organic fertilizer with chitosan as a binder. The rate of the nitrogen release was studied and simulated with MATLAB. The result shows that the nitrogen loss by water leaching decreased up to 85% in chitosan/organic fertilizer rather than the fertilizer without chitosan. By MATLAB simulation, the release of nitrogen has followed the proposed mathematical model in which the mass transfer occurred dominated by diffusion mechanism with the diffusivity coefficient of 1.61x10-5 cm2/s. Keywords: chitosan; organic fertilizer; slow-release fertilizer A B S T R A K Penggunaan pupuk anorganik masih memiliki efisiensi rendah yang disebabkan oleh cepatnya pelepasan nutrisi pupuk ke lingkungan sehingga nutrisi tersebut tidak dapat terserap baik oleh tanaman. Selain itu, aplikasi pupuk anorganik yang berulang dalam satu periode tanam berdampak pada peningkatan biaya operasional. Salah satu metode untuk mengatasi permasalahan tersebut adalah dengan menggunakan pupuk lepas lambat (slow-release fertilizer) atau dengan menggunakan pupuk organik. Tujuan pada penelitian ini adalah dengan mengombinasikan dua metode tersebut yaitu dengan memodifikasi formulasi dari pupuk organik lokal dengan penambahan kitosan sehingga dapat diperoleh pupuk organik yang memiliki sifat lepas lambat. Laju pelepasan nitrogen dari pupuk yang dihasilkan kemudian dianalisis dan disimulasikan dengan software MATLAB. Hasil penelitian menunjukkan bahwa nitrogen yang hilang pada komposit pupuk organik-kitosan melalui water leaching menurun hingga 85% jika dibandingkan dengan komposit pupuk organik tanpa kitosan. Hasil simulasi MATLAB juga menunjukkan bahwa laju pelepasan nitrogen pada pupuk mengikuti model matematika yang diusulkan yaitu dengan mekanisme difusi, nilai koefisien difusivitas yang diperoleh adalah sebesar 1,61×10-5 cm2/s. Kata kunci: kitosan; pupuk lepas lambat; pupuk organik |
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Keywords: chitosan; organic fertilizer; slow-release fertilizer A B S T R A K Penggunaan pupuk anorganik masih memiliki efisiensi rendah yang disebabkan oleh cepatnya pelepasan nutrisi pupuk ke lingkungan sehingga nutrisi tersebut tidak dapat terserap baik oleh tanaman. Selain itu, aplikasi pupuk anorganik yang berulang dalam satu periode tanam berdampak pada peningkatan biaya operasional. Salah satu metode untuk mengatasi permasalahan tersebut adalah dengan menggunakan pupuk lepas lambat (slow-release fertilizer) atau dengan menggunakan pupuk organik. Tujuan pada penelitian ini adalah dengan mengombinasikan dua metode tersebut yaitu dengan memodifikasi formulasi dari pupuk organik lokal dengan penambahan kitosan sehingga dapat diperoleh pupuk organik yang memiliki sifat lepas lambat. Laju pelepasan nitrogen dari pupuk yang dihasilkan kemudian dianalisis dan disimulasikan dengan software MATLAB. Hasil penelitian menunjukkan bahwa nitrogen yang hilang pada komposit pupuk organik-kitosan melalui water leaching menurun hingga 85% jika dibandingkan dengan komposit pupuk organik tanpa kitosan. Hasil simulasi MATLAB juga menunjukkan bahwa laju pelepasan nitrogen pada pupuk mengikuti model matematika yang diusulkan yaitu dengan mekanisme difusi, nilai koefisien difusivitas yang diperoleh adalah sebesar 1,61×10-5 cm2/s. 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