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Mineralogical Characteristics and The Pedogenetic Processes of Soils on Coral Reefs in Ambon Devnita, Rina
Indonesian Journal on Geoscience Vol 4, No 1 (2009)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol4no1.20093The mineralogical characteristics of soils developed on coral reef parent materials in Hitu and Wailiha, Ambon, were investigated regarding to the relationship to pedogenesis. The analyses concerned with the characteristics of soil chemical, physical, and mineralogy of the rock fragment and sand, silt and clay fractions are to investigate the pedogenesis processes. Both soil profiles indicate the clayey texture, slightly neutral reaction, high cation exchange capacity, base saturation, and iron oxide. The mineralogical analyses of rock fragments and sand fractions indicate that besides carbonate minerals, silicate minerals were also found. The clay mineralogy showing the domination of kaolinite, gibbsite, and goethite, reflects that the soil is intensely weathered. Pedogenesis process showing the clay translocation, indicates that the weathering process has been occuring under the tropical influence. Â Â

Micromorphological Characterization of Some Volcanic Soil In West Java Arifin, Mahfud; Devnita, Rina
Indonesian Journal on Geoscience Vol 3, No 4 (2008)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol3no4.20082Micromorphological characterization has been studied on six pedons of soils developing in volcanic materials in West Java. The pedons represent deposits of different volcanoes (Mount Tangkuban Perahu, Mount Patuha and Mount Papandayan) with different ages (Pleistocene, Holocene) within two types of volcanisms (andesitic, basaltic), and three agroclimatic zones (A, B1, B2). Undisturbed soil samples were taken from each identifiable horizon for thin section preparations. Observations were carried out by means of a magnifying lens, binocular stereomicroscope, polarization microscope, and scanning electron microscope (SEM). The result demonstrates that micromorphological characteristics of volcanic soils developing from different ages, types of parent material, and climate were different through their c/f related distribution 2Âµ patterns, c/f ratios, sorting, infillings and coatings of voids, and microstructure. Â

Melanic and Fulvic Andisols in Volcanic Soils derived from some Volcanoes in West Java Devnita, Rina
Indonesian Journal on Geoscience Vol 7, No 4 (2012)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v7i4.149Melanic and fulvic Andisols are the great groups in the classification of volcanic soils Andisols, which describe the soils with high organic carbon content in the epipedon. The organic C must be more than 6% in the upper 30 cm with the value and chroma are 2 or less for melanic and more than 2 for fulvic. Melanic epipedon also has to have the melanic index that is 1.70 or less. The objective of this study is to investigate the melanic and fulvic Andisols in volcanic soils that developed under pine forest vegetation (Pinus merkusii)Â from different parent materials and ages of Mount Tangkuban Parahu (andesitic, Holocene) and Mount Tilu (basaltic, Pleistocene). The method used was a descriptive comparative survey of three profiles in Mount Tangkuban Parahu and three profiles in Mount Tilu. Analyses were done for each horizon in the profilesÂ comprising the investigation of andic soil properties through the analyses of organic C, bulk density, Al + Â½ Fe (ammonium oxalate), and P-retention. The investigations were continued by further calculation of organic C content and by investigation of soil colour with Munsell Soil Colour Chart. The results showed that theÂ two profiles in Mount Tangkuban Parahu and two profiles in Mount Tilu are fulvic Andisol. No melanic Andisols were found in both locations. Pine forest vegetation encourages the formation of fulvic Andisols were derived from andesitic-Holocene parent materials or basaltic-Pleistocene parent materials.

Pengaruh Terak Baja dan Bokashi Sekam Padi terhadap Kemantapan Agregat dan BiomassaTanaman Jagung pada Andisol, Lembang Yulina, Henly; Devnita, Rina; Harryanto, Rachmat
Jurnal Agro Wiralodra Vol 1 No 1 (2018): Jurnal Agro Wiralodra
Publisher : Universitas Wiralodra

Andisol mempunyai sifat fisika tanah yang baik, namun bermasalah dengan retensi P. Pemberian amelioran untuk mengurangi retensi P, diharapkan dapat mempertahankan bahkan meningkatkan parameter fisika tanah tersebut. Penelitian bertujuan untuk mengetahui interaksi terak baja dengan bokashi sekam padi terhadap kemantapan agregat dan biomassa tanaman jagung manis pada Andisol Lembang. Penelitian menggunakan Rancangan Acak Kelompok Pola Faktorial dengan dua faktor. Faktor pertama terak baja dan faktor kedua bokashi sekam padi masing- masing 4 taraf : 0%, 2,5%, 5,0%, dan 7,5%, diulang dua kali. Hasil penelitian menunjukkan bahwa terdapat interaksi antara terak baja dengan bokashi sekam padi terhadap kemantapan agregat tanah pada jagung manis setelah panen dan biomassa tanaman jagung manis. Kombinasi dosis 5,0% terak baja dan 7,5% bokashi sekam padi memberikan hasil terbaik terhadap kemantapan agregat tanah pada jagung manis setelah panen dan biomassa tanaman jagung manis, kombinasi 2,5% terak baja dan 7,5% bokashi sekam padi memberikan hasil terbaik.

Hubungan Porositas Tanah Dan Air Tersedia Dengan Biomassa Tanaman Jagung Manis Dan Brokoli Setelah Diberikan Kombinasi Terak Baja Dan Bokashi Sekam Padi Pada Andisol, Lembang Yulina, Henly; Devnita, Rina; Harryanto, Rachmat
Jurnal Agro Wiralodra Vol 2 No 2 (2019): Jurnal Agro Wiralodra
Publisher : Universitas Wiralodra

Penelitian bertujuan untuk mengetahui hubungan antara porositas tanah dan air tersedia terhadap biomassa tanaman jagnung manis dan brokoli setelah diberikan kombinasi terak baja dan bokashi sekam padi pada Andisol Lembang. Penelitian menggunakan Rancangan Acak Kelompok Pola Faktorial dengan dua faktor. Faktor pertama terak baja dan faktor kedua bokashi sekam padi masing- masing 4 taraf : 0%, 2,5%, 5,0%, dan 7,5%, diulang dua kali. Hasil penelitian menunjukkan bahwa terdapat hubungan antara porositas tanah dan air tersedia dengan biomassa tanaman jagung manis dan brokoli, namun biomassa kedua tanaman tidak dipengaruhi oleh porositas tanah dan air tersedia tersebut namun dipengaruhi oleh faktor fisika tanah lain, seperti bobot isi dan kemantapan agregat tanah.

Hubungan Bobot Isi dan Kemantapan Agregat Tanah Andisol Lembang terhadap Biomassa Tanaman Jagung Manis setelah dilakukan Kombinasi Terak Baja dan Bokashi Sekam Padi Yulina, Henly; Devnita, Rina; Harryanto, Rachmat
Jurnal Agro Wiralodra Vol 1 No 2 (2018): Jurnal Agro Wiralodra
Publisher : Universitas Wiralodra

Penelitian ini bertujuan untuk mengetahui hubungan bobot isi dan kemantapan agregat tanah Andisol Lembang terhadap biomassa tanaman jagung manis. Penelitian menggunakan Rancangan Acak Kelompok Pola Faktorial dengan dua faktor. Faktor pertama terak baja dan faktor kedua bokashi sekam padi masing-masing 4 taraf, yaitu 0%, 2,5%, 5,0% dan 7,5%, diulang dua kali. Hubungan antara masing-masing perlakuan selanjutnya di analisis menggunakan model regresi linier sederhana. Hasil penelitian menunjukkan bahwa terdapat hubungan antara bobot isi, kemantapan agregat tanah dengan biomassa tanaman jagung manis, namun biomassa tanaman jagung manis tidak dipengaruhi oleh bobot isi dan kemantapan agregat.

RESPON BOBOT ISI, KEMANTAPAN AGREGAT, DAN POROSITAS TANAH PADA TANAMAN CABAI MERAH SETELAH VEGETATIF AKHIR TERHADAP KOMBINASI TERAK BAJA DAN BOKASHI SEKAM PADI PADA ANDISOL, LEMBANG Yulina, Henly; Devnita, Rina; Harryanto, Rachmat
Jurnal Agro Wiralodra Vol 2 No 1 (2019): Jurnal Agro Wiralodra
Publisher : Universitas Wiralodra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31943/agrowiralodra.v2i1.26

Penelitian ini bertujuan untuk mengetahui respon bobot isi, porositas, dan kemantapan agregat tanah pada tanaman cabai merah setelah vegetatif akhir terhadap kombinasi terak baja dengan bokashi sekam padi pada Andisol Lembang. Penelitian menggunakan Rancangan Acak Kelompok Pola Faktorial dengan dua faktor. Faktor pertama terak baja dan faktor kedua bokashi sekam padi masing- masing 4 taraf : 0%, 2,5%, 5,0%, dan 7,5%, diulang dua kali. Hasil penelitian menunjukkan bahwa tidak terjadi interaksi antara terak baja dengan bokashi sekam padi terhadap bobot isi dan porositas tanah, namun terak baja dan bokashi sekam padi berpengaruh mandiri terhadap kemantapan agregat tanah pada tanaman cabai merah setelah vegetatif akhir. Penurunan bobot isi dan peningkatan porositas tanah terbesar terjadi pada dosis 7,5% (b3), sedangkan penurunan kemantapan agregat tanah terbesar terjadi pada dosis 5,0% (t2) terak baja (4,38) dan dosis 7,5% (b3) bokashi sekam padi (3,25), namun dengan pemberian masing- masing dosis 2,5% pada terak baja (t1) dan bokashi sekam padi (b1) sudah dapat menurunkan nilai kemantapan agregat tanah

Micromorphological Characterization of Some Volcanic Soil In West Java Arifin, Mahfud; Devnita, Rina
Indonesian Journal on Geoscience Vol 3, No 4 (2008)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol3no4.20082Micromorphological characterization has been studied on six pedons of soils developing in volcanic materials in West Java. The pedons represent deposits of different volcanoes (Mount Tangkuban Perahu, Mount Patuha and Mount Papandayan) with different ages (Pleistocene, Holocene) within two types of volcanisms (andesitic, basaltic), and three agroclimatic zones (A, B1, B2). Undisturbed soil samples were taken from each identifiable horizon for thin section preparations. Observations were carried out by means of a magnifying lens, binocular stereomicroscope, polarization microscope, and scanning electron microscope (SEM). The result demonstrates that micromorphological characteristics of volcanic soils developing from different ages, types of parent material, and climate were different through their c/f related distribution 2Âµ patterns, c/f ratios, sorting, infillings and coatings of voids, and microstructure. Â

Mineralogical Characteristics and The Pedogenetic Processes of Soils on Coral Reefs in Ambon Devnita, Rina
Indonesian Journal on Geoscience Vol 4, No 1 (2009)
Publisher : Geological Agency

http://dx.doi.org/10.17014/ijog.vol4no1.20093The mineralogical characteristics of soils developed on coral reef parent materials in Hitu and Wailiha, Ambon, were investigated regarding to the relationship to pedogenesis. The analyses concerned with the characteristics of soil chemical, physical, and mineralogy of the rock fragment and sand, silt and clay fractions are to investigate the pedogenesis processes. Both soil profiles indicate the clayey texture, slightly neutral reaction, high cation exchange capacity, base saturation, and iron oxide. The mineralogical analyses of rock fragments and sand fractions indicate that besides carbonate minerals, silicate minerals were also found. The clay mineralogy showing the domination of kaolinite, gibbsite, and goethite, reflects that the soil is intensely weathered. Pedogenesis process showing the clay translocation, indicates that the weathering process has been occuring under the tropical influence. Â Â

Melanic and Fulvic Andisols in Volcanic Soils derived from some Volcanoes in West Java Devnita, Rina
Indonesian Journal on Geoscience Vol 7, No 4 (2012)
Publisher : Geological Agency

DOI:Â 10.17014/ijog.v7i4.149Melanic and fulvic Andisols are the great groups in the classification of volcanic soils Andisols, which describe the soils with high organic carbon content in the epipedon. The organic C must be more than 6% in the upper 30 cm with the value and chroma are 2 or less for melanic and more than 2 for fulvic. Melanic epipedon also has to have the melanic index that is 1.70 or less. The objective of this study is to investigate the melanic and fulvic Andisols in volcanic soils that developed under pine forest vegetation (Pinus merkusii)Â from different parent materials and ages of Mount Tangkuban Parahu (andesitic, Holocene) and Mount Tilu (basaltic, Pleistocene). The method used was a descriptive comparative survey of three profiles in Mount Tangkuban Parahu and three profiles in Mount Tilu. Analyses were done for each horizon in the profilesÂ comprising the investigation of andic soil properties through the analyses of organic C, bulk density, Al + Â½ Fe (ammonium oxalate), and P-retention. The investigations were continued by further calculation of organic C content and by investigation of soil colour with Munsell Soil Colour Chart. The results showed that theÂ two profiles in Mount Tangkuban Parahu and two profiles in Mount Tilu are fulvic Andisol. No melanic Andisols were found in both locations. Pine forest vegetation encourages the formation of fulvic Andisols were derived from andesitic-Holocene parent materials or basaltic-Pleistocene parent materials.

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