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All Journal Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Jurnal Ilmu Tanah dan Lingkungan (Journal of Soil Science and Environment) Biota: Jurnal Ilmiah Ilmu-Ilmu Hayati Jurnal Perikanan Universitas Gadjah Mada
Bostang Radjagukguk
Soil Science Division, Faculty of Agriculture, Gadjah Mada University, Yogyakarta
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Economics, Econometrics & Finance Environmental Science Immunology & microbiology

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Ketersediaan Fosfor pada Tanah Andisol untuk Jagung (Zea maysL.) oleh Inokulum Bakteri Pelarut Fosfat , Tamad; Azwar Ma’as; Bostang Radjagukguk; Eko Hanudin; Jaka Widada
Indonesian Journal of Agronomy Vol. 41 No. 2 (2013): Jurnal Agronomi Indonesia
Publisher : Indonesia Society of Agronomy (PERAGI) and Department of Agronomy and Horticulture, Faculty of Agriculture, IPB University, Bogor, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (295.588 KB) | DOI: 10.24831/jai.v41i2.7516

Abstract

Andisols has relatively low phosphorus availability due to its adsorption by allophane. Phosphate solubilizing bacteria (PSB) increases the availability of P via release of adsorpted-P. The aims of this research were to determine: 1) anorganicP solubilization, 2) organic-P mineralization, 3) blocking of Andisols adsorption site, and 4) effective PSB inoculant. The research was arranged in completely randomized design, with PSB inoculant as treatment. Variables observed were solubleP, mineralize-P, adsorpted-P, pH, total acidity, PSB population, phosphatase and phythase activity, relative surface charge, and maize’s growth component. The result showed that PSB inoculation increased soluble-P from 30 to between 150 and 195 ppm P, increased mineralize-P from 23.7 to between 63.6 and 91.7 ppm P, and decreased P-adsorption from 95 to between 36 and 13%. PSB inoculation decreased the Andisols pH, increased the total acidity, PSB population, the phosphatase and phytase activity, and PSB had relatively high of relative surface charge (69%). The PSB inoculation increased maize P absorption in the range of 70 and 75 mg P plant-1, and increased relative agronomic effectiveness (RAE )between 145 and 150%. Liquid and solid PSB inoculant had no different effect in increasing maize growth. Keywords: Andisol, P release, phosphate solubilizing bacteria, phosphatase, phytase
KAJIAN SEBARAN KADMIUM DALAM SAYURAN DAN TANAH DI BANTARAN SUNGAI CIKARANG BEKASI LAUT (CBL) Alfandi Alfandi; Salaudin Djalal Tandjung; Bostang Radjagukguk; Narsito Narsito
Jurnal Ilmu Tanah dan Lingkungan Vol 12 No 1 (2010): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan, Fakultas Pertanian, IPB University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (509.096 KB) | DOI: 10.29244/jitl.12.1.1-8

Abstract

Contamination of contaminants in river are more due to human activities (antropogenic), such as the disposal of industrial waste and domestic waste. One type of inorganic pollutants that is toxic to living organism including human is cadmium (Cd). The movement of Cd in river water into the soil along the river is naturally and by human activity. The objectives of this study was to examine the distribution of Cd in soil on the river banks of the Cikarang Bekasi Laut (CBL) river, in Bekasi West Java, based on the distance from the pollutant sources during rainy and dry season (spatially and temporally). This study used a survey method in sampling plants, water and soil. Sampling was conducted at 10 sites and 10 observation times (dry and rainy season). The analyses of Cd content were conducted on plant, water and soil samples. In addition, pH was also measured in soil and water samples. Vegetable samples were collected from the field were kale, spinach and caisin. Statistical analyses comparized of analyses of variance (F test), comparatine analyses of the mean and correlation analyses. The results showed that the contents of Cd in the soil samples that close to the surface of the river water were higher than those of other soil samples. This was caused by the movement of Cd from the river water naturally due to changes in water level or river discharge fluctuation, as a consequence of changes in dry and rainy seasons. At sites further from the river (on land of cultivation), the presence of Cd in soil was mainly due to the use of river water for irrigation. Watering plant was mostly done during the dry season, at which the concentration of Cd in river water was relatively higher. The content of Cd in plant tissue (Spinach, kale and caisin) had a positive correlation with the content of Cd in the soil. The average content of Cd from the three plants were spinach > kale > caisin, consecutively. Keywords: antropogenic, cadmium (Cd), Cd uptake, pollution, riverbanks
Isolasi dan Seleksi Bakteri dari Sedimen Mangrove untuk Pembentukan Konsorsium Bakteri Perombak Dibenzofuran Yanisworo W. Ratih; Bostang Radjagukguk; Erni Martani; Irfan D. Prijambada
Biota : Jurnal Ilmiah Ilmu-Ilmu Hayati Vol 16, No 2 (2011): June 2011
Publisher : Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24002/biota.v16i2.115

Abstract

Dibenzofuran merupakan salah satu senyawa hidrokarbon aromatis polisiklik (HAP) yang mengandung oksigen. Paparannya di alam harus segera ditanggulangi karena dibenzofuran berperan sebagai prekursor bagi senyawa berkhlor turunannya yang bersifat lebih toksik. Dibenzofuran dapat dijadikan senyawa model karena beberapa bakteri perombak dibenzofuran juga mampu merombak senyawa mirip lainnya seperti dibenzodioksin, fluorena, fluorantena, dibenzofuran terkhlorinasi, fenantrena dan antrasena. Penelitian ini dilakukan untuk membentuk konsorsium bentukan yang mempunyai kemampuan tinggi dalam merombak dibenzofuran. Isolat bakteri diperoleh dari sedimen mangrove asal Balongan, Indramayu, Jawa Barat menggunakan medium mineral cair yang diperkaya dengan dibenzofuran sebagai satu-satunya sumber karbon dan energi. Total 12 isolat bakteri, GMYk-1, GMYk-2, GMYk-3, GMYk-4, GMYk-5, GMYs-1, GMYs-2, GMYs-3, GMYs-4, GMYs-5, GMYs-6 dan GMYs-7 berhasil diisolasi dari sedimen. Berdasarkan pengamatan terhadap keragaman isolat-isolat yang diperoleh serta interaksi di antara isolat dalam merombak dibenzofuran, empat isolat berhasil terseleksi untuk menyusun konsorsium bentukan. Isolat tersebut adalah GMYs-1, GMYs-6, GMYs-7 dan GMYk-1. Berdasarkan kemampuan merombak dibenzofuran dari kombinasi isolat-isolat yang disusun, biakan campuran GMYs-1- GMYs-6-GMYk-1 dipilih sebagai konsorsium bentukan. Konsorsium bentukan mempunyai kemampuan paling tinggi dalam merombak dibenzofuran.
Effect of AMF Inoculation on the Growth of Combretocarpus rotundatus (Miq) on a Peat Soil from Central Kalimantan (For Restoration Ex-Mega Rice Project Central Kalimantan) Burhanuddin Burhanuddin; Siti Kabirun; Bostang Radjagukguk; Sumardi Sumardi
Biota : Jurnal Ilmiah Ilmu-Ilmu Hayati Vol 15, No 1 (2010): February 2010
Publisher : Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24002/biota.v15i1.2649

Abstract

Diperlukan teknik silvikultur dengan memanfaatkan jamur mikoriza arbuskula (JMA) untuk memulihkan hutan rawa gambut yang terdegradasi. JMA berperan penting pada pertumbuhan dan ketahanan hidup pohon-pohonan. Penelitian ini bertujuan untuk mengetahui keberadaan dan bentuk dari JMA di hutan rawa gambut yang sudah terdegradasi pada blok C bekas pengembangan lahan gambut satu juta ha di Kelampangan Kalimantan Tengah. Kondisi lahan hanya ditumbuhi vegetasi jenis-jenis pioner. Contoh tanah diambil dibawah perakaran lima jenis tanaman pioner (Melastoma sp, Combretocarpus sp, Acacia sp, Cratoxylon sp, dan Nephrolepsis sp), kemudian contoh tanah dihitung jumlah spora dengan metode saringan basah. Jumlah spora terbanyak ada di bawah perakaran tanaman Melastoma sp, kemudian Acacia sp, dan Combretocarpus sp. Didapatkan tiga genus JMA: Glomus, Gigaspora, dan Acaulospora. Penelitian di rumah kaca bertujuan untuk mengetahui pengaruh inokulasi JMA jenis Glomus sp TD15, Glomus sp D32, dan Gigaspora sp pada semai perepat (C. rotundatus). Hasil penelitian menunjukkan JMA memberikan pengaruh pada parameter semai yang diukur. Jenis JMA Glomus sp TD15 meningkatkan pertumbuhan semai perepat yang ditunjukkan oleh parameter tinggi semai, diameter semai, dan jumlah daun per tanaman. Pada media gambut semai C. rotundatus sangat tergantung pada asosiasi JMA dalam meningkatkan pertumbuhan tanaman.
KUALITAS AIR DAN TANAH TAMBAK UDANG YANG MENDAPAT PERLAKUAN PENGERINGAN DAN AERASI SETELAH PENGGENANGAN Bambang Triyatmo; Bostang Radjagukguk; Iwan Yusuf Bambang Lelana
Jurnal Perikanan Universitas Gadjah Mada Vol 1, No 1 (1996)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jfs.8796

Abstract

The experiment was carried out to evaluate the water and soil quality of pond, which were subjected to drying and aeration after inundation. The objective of the experiment was to find out which soil drying and water aeration treatments were the best for shrimp culture.The soil used was obtained from an intensive shrimp pond and sea water was collected  from pond area in jepara coast. The soil drying treatments consisted of drying the wet soil under the sun to air dry condition, field capacity condition and water saturated condition. The soil drying treatments were carried out for 64 days. The aeration treatments after inundation consisted of with aeration and without aeration. Soil less sea water also was prepared as control. The aeration treatments were carried out for 64 days. The soil and water quality were  observed during soil drying and water aeration treatments.Result of this experiment indicated that drying the pond bottom soil until field capacity condition gave the highest rate of organic matter decompotition followed by air dried soil, then water saturated oil. The decompotition of soil organic matter in the field capacity condition reached optimum on day 8 to 16. The pond bottom soil in water saturated condition contained lower NH3, NO2- and H2S than ind dried soil. Aeration gave better condition than the non aeration one. It seemed the best water quality condition for shrimp fry stocking occurred 4-8 days after inundation combined with aeration.
Co-Authors , Tamad Alfandi Alfandi Azwar Ma’as Bambang Triyatmo Burhanuddin Burhanuddin Eko Hanudin Erni Martani Irfan D. Prijambada Iwan Yusuf Bambang Lelana JAKA WIDADA Narsito Narsito Salaudin Djalal Tandjung Siti Kabirun Sumardi Sumardi Yanisworo W. Ratih