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All Journal Jurnal Pertanian Agros Journal of Applied Agricultural Science and Technology
Witman, Steven
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Agriculture, Biological Sciences & Forestry

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Optimization of Fluid-Type Roasting Machine on Robusta Roasted Coffee Characteristics Rahayuningtyas, Ari; Azizah, Ida Farikha; Witman, Steven; Hidayat, Dadang Dayat; Rohzan, Alifia Fauziah; Ikrawan, Yusep; Ngatinem, Ngatinem
Journal of Applied Agricultural Science and Technology Vol. 8 No. 3 (2024): Journal of Applied Agricultural Science and Technology
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jaast.v8i3.282

Abstract

Coffee is a superior plantation commodity playing an important role in Indonesian economic growth, as a contributor to income and provider of employment. The handling process of coffee, particularly at roasting stage, has a significant impact on the quality of the final product. The Research Center for Appropriate Technology, National Research and Innovation Agency, has developed fluid-type roasting machine with a capacity of 750 grams (g) and fueled by LPG (liquefied petroleum gas). Therefore, this research aimed to determine the characteristics of robusta roasted coffee through performance tests of fluid-type roasting machine. Performance tests were carried out to determine the static characteristics of temperature sensor and ensure accurate provision as well as consistent readings in effectively controlling roasting process. Some of the characteristics that were determined included moisture content by thermogravimetric method, color, texture, caffeine, and microscopic analysis. The results showed that fluid-type roasting machine had a high-temperature sensor accuracy of 1.3% and repeatability of 0.69. The physical and chemical analysis showed that roasting temperature significantly affected the characteristics of roasted coffee beans. Additionally, higher temperature caused an increase in cracking of coffee beans, ash content, texture, caffeine content, and darker color, along with lower moisture content.
SIAM MUTIARA DAN SIAM SABA VARIETAS UNGGUL-LOKAL PADI DAN TEKNIS BUDIDAYANYA DI LAHAN PASANG SURUT Fadhilah, Nur; Witman, Steven; Agustina, Rusmila; Khairullah, Izhar
Agros Journal of Agriculture Science Vol 26, No 1 (2024): Edisi APRIL
Publisher : Fakultas Pertanian, Universitas Janabadra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37159/jpa.v26i1.4149

Abstract

Lahan rawa saat ini dan di masa mendatang merupakan salah satu area potensial dalam peningkatan produksi dan produktivitas tanaman pangan, terutama padi. Kendala utama dalam pengembangan padi di lahan rawa meliputi masalah kesuburan tanah (seperti kemasaman, kekurangan hara, dan kelebihan besi), permasalahan air (baik kekeringan maupun genangan, serta kemasaman dan salinitas), serta masalah biologis (serangan hama, penyakit, dan gulma). Di rawa pasang surut Kalimantan Selatan, petani mengkultivasi berbagai varietas lokal, di antaranya Siam Mutiara dan Siam Saba, yang telah mengalami pemuliaan menjadi varietas lokal unggul. Keunggulan varietas ini terletak pada kualitas berasnya yang jernih, ukuran butir yang kecil dan ramping, serta warna yang cenderung kuning kecoklatan. Tingkat kesuburan gabah per malai tinggi, pertumbuhan tanaman yang baik, konsistensi waktu berbunga, serta kematangan malai yang optimal, menjadi karakteristik yang diunggulkan. Selain itu, nilai ekonomisnya juga tinggi karena cocok dengan preferensi konsumen. Teknologi budidaya varietas lokal padi melibatkan berbagai tahapan, termasuk persemaian, pengolahan tanah, penanaman, pemupukan, pemeliharaan, serta proses panen dan pascapanen.
Co-Authors Agustina, Rusmila Ari Rahayuningtyas Azizah, Ida Farikha Hidayat, Dadang Dayat Ikrawan, Yusep Izhar Khairullah Ngatinem, Ngatinem Nur Fadhilah Rohzan, Alifia Fauziah