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Ketersediaan Fosfor pada Tanah Andisol untuk Jagung (Zea maysL.) oleh Inokulum Bakteri Pelarut Fosfat Tamad, ,; Ma’as, Azwar; Radjagukguk, Bostang; Hanudin, Eko; Widada, Jaka
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol 41, No 2 (2013): JURNAL AGRONOMI INDONESIA
Publisher : Bogor Agricultural University

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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 WATER TABLE PADA SEMAI PEREPAT(Combretocarpus rotundatus Miq dan JELUTUNG ( Dyera lowii Hook) DIINOKULASI Glomus sp 3 DI TANAH GAMBUT Burhanuddin, Burhanuddin; Kabirun, Siti; Radjagukguk, Bostang; Sumardi, Sumardi
Jurnal Penelitian Hutan Tanaman Vol 8, No 3 (2011): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Peningkatan Produktivitas Hutan

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Abstract

KARAKTERISTIK KONSORSIUM BAKTERI PEROMBAK DIBENZOFURAN DARI SEDIMEN MANGROVE Wijayaratih, Yanisworo; Radjagukguk, Bostang; Martani, Erni; Prijambodo, Irfan D.
Jurnal Manusia dan Lingkungan (Journal of People and Environment) Vol 15, No 2 (2008)
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

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Abstract

Dibenzofuran merupakan salah satu senyawa hidrokarbon aromatis polisiklik yang terdiri atas dua cincin benzene yang dihubungkan melalui satu atom oksigen dan satu atom karbon. Dibenzofuran yang mengalami khlorinasi bersifat lebih meracun dari pada senyawa asalnya, dibenzofuran. Penelitian ini bertujuan untuk mendapatkan konsorsium bakteri perombak dibenzofuran dari sediment mangrove serta menyelidiki sifat mikrobiologisnya. Konsorsium dikembangkan dari sediment mangrove menggunakan medium mineral cair yang diperkaya dengan 1000 mg l-1 dibenzofuran sebagai satu-satunya sumber karbon dan energi. Hasil penelitian menunjukkan bahwa konsorsium yang diperoleh mempunyai kemampuan merombak dibenzofuran yang relatif tinggi. Kecepatan perombakan konsorsium terpilih adalah 211,5 mg l-1hari-1. Dari konsorsium terpilih diperoleh lima isolat bakteri. Pertumbuhan konsorsium lebih tinggi dari pada masing-masing isolat atau kombinasinya. Jumlah bakteri dalam konsorsium terpilih mencapai 3,9x1012 CFU ml-1 sedangkan pada masing-masing isolat dan kombinasinya berkisar dari 1,0x108 sampai 7,9x1010 CFU ml-1.
INFLUENCE OF PARAQUAT HERBICIDE ON SOIL BACTERIA Rhizobium sp. Martani, Erni; Wibowo, Kurniawan; Radjagukguk, Bostang; Margino, Sebastian
Jurnal Manusia dan Lingkungan (Journal of People and Environment) Vol 8, No 2 (2001)
Publisher : Pusat Studi Lingkungan Hidup Universitas Gadjah Mada

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Abstract

Pencemaran pestisida merupakan salah satu masalah lingkungan yang menyebabkan gangguan terhadap organisme tanah. Paraquat adalah bahan aktif beberapa jenis herbisida yang banyak diaplikasikan di lahan gambut dan lahan pertanian tadah hujan. Studi ini dilakukan untuk mengetahui pengaruh herbisida paraquat terhadap bakteri Rhizobium sp. Tiga puluh lima strain Rhizobium sp. telah diuji dengan menggunakan teknik difusi cakram kertas (paper disc). Sebagian strain adalah hasil isolasi dari ranah, bintil akar tanaman Ieguminosa dan inokulum leguminosa (Legin - Iegume Inoculum). Enam strain lain aclalah bakteri Rhizobium japonicum. Hasil penelitian menunjukkan hahwa paraquat memiliki daya hambat terhadap hakteri Rhizohium sp. Sebanyak 17,14% (enam strain) dari seluruh strain yang diuji, tidak mengalami penghambatan sampai konsentrasi paraquat 400 ppm. Bakteri ini memiliki prospek bagus untuk digunakan sebagai inokulum rhizobium terutama di lahan pertanian yang telah tercemari herbisida, khususnya yang mempunyai bahan aktif paraquat. Sebagian besar strain yang digunakan (82,86%) terhambat oleh 20 ppm parakuat dan daya hambat tersebut makin besar seiring dengan meningkatnya konsentrasi paraquat. Mengingat makin meluasnya pemakaian herbisida berbahan aktif paraquat di Indonesia dan peran Rhizobium dalam fiksasi nitrogen, hasil penelitian ini fiksasi memiliki arti penting, terutama bagi petani agar berhati-hati dalam pemakaian pestisida.
KAJIAN SEBARAN KADMIUM DALAM SAYURAN DAN TANAH DI BANTARAN SUNGAI CIKARANG BEKASI LAUT (CBL) Alfandi, Alfandi; Tandjung, Salaudin Djalal; Radjagukguk, Bostang; Narsito, Narsito
Jurnal Ilmu Tanah dan Lingkungan Vol 12, No 1 (2010): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

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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
PERAN PEMUPUKAN POSFOR DALAM PERTUMBUHAN TANAMAN JAGUNG (Zea mays L.) DI TANAH REGOSOL DAN LATOSOL FahmF, Arifin; Syamsudin, Syamsudin; Utami, Sri Nuryani H; Radjagukguk, Bostang
BERITA BIOLOGI Vol 9, No 6 (2009)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

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Abstract

Phosphorus (P) is an essential element for plants, deficiency and excess of P in soil will limit plant growth. It is required to applicate P fertilizer in appropriate dosage for promoting plant growth on the soil with different properties. The purpose of experiment was to study the respon of maize (Zea mays L.) for phosphorus fertilization on Regosol and Latosol soils. A glass house experiment was conducted to study maize response on P fertilizer application in Regosol and Latosol soils. The treatment 1was 0, 112, 336, 1008, 3024 and 9072 kg superfosfat ha . P fertilizer tend to increase the biomass of maize but exceed of P fertilizer reduced maize biomass. The optimum fertilization and vailability of P for plant affected by soil properties.
KAJIAN WATER TABLE PADA SEMAI PEREPAT(Combretocarpus rotundatus Miq dan JELUTUNG ( Dyera lowii Hook) DIINOKULASI Glomus sp 3 DI TANAH GAMBUT Burhanuddin, Burhanuddin; Kabirun, Siti; Radjagukguk, Bostang; Sumardi, Sumardi
Jurnal Penelitian Hutan Tanaman Vol 8, No 3 (2011): JURNAL PENELITIAN HUTAN TANAMAN
Publisher : Pusat Penelitian dan Pengembangan Hutan

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Abstract

Penelitian pengaruh (jeluk muka air tanah) terhadap pertumbuhan perepat (Combretocarpus rotundatus Miq) dan jelutung (Hook) dengan inokulasi jamur mikoriza arbuskula (JMA) dan pemupukan SP 36 di tanah gambut dilaksankan di rumah kaca laboratorium Ilmu Tanah Fakultas Pertanian Universeitas Gadjah Mada Yogyakarta selama 14 minggu. Tujuan penelitian untuk mengetahui pengaruh jeluk muka air tanah, pemupukan P dan inokulasi JMA terhadap pertumbuhan semai perepat dan jelutung. Percobaan persemaian menggunakan Rancangan Acak Lengkap Faktorial dengan tiga ulangan. Pengamatan dilakukan pada umur semai perepat dan jelutung 14 minggu setelah penyapihan yang meliputi: tinggi, diameter, jumlah daun, dan untuk berat kering pucuk dan serapan P tanaman dilakukan setelah panen. Percobaan pengujian jeluk muka air tanah pada semai perepat dan jelutung yang dipupuk SP36 takaran 100 ppm dan diinokulasi dengan glomus sp 3 membuktikan bahwa jeluk muka air tanah terbaik adalah 20 cm. Pada jeluk muka air tanah 20 cm peningkatan pertumbuhan untuk perepat tinggi 324,86 %, diameter 366,67 %, jumlah daun 437,50 %, berat kering pucuk 630,00 % dan serapan P 835,80 %. Untuk jelutung tinggi 107,61 %, diameter 136,05 %, jumlah daun 42,01 %, berat kering pucuk 643,83 % dan serapan P 851,56 %. Disimpulkan bahwa inokulasi dengan JMA jenis glomus sp 3 yang dikombinasikan dengan pemberian pupuk P takaran 100 ppm dan penanaman pada jeluk muka air tanah 20 cm dan 10 cm dapat dimanfaatkan secara luas untuk meningkatkan pertumbuhan bibit perepat (C. rotundatus Miq) dan jelutung (D. lowii Hook) di persemaian.Kata Kunci:Kata kunci : ex-PLG, gambut,Glomus sp 3,Water table
DEVELOPMENT OF ARBUSCULAR MYCHORRHIZHAE AND GROWTH OF TEAK (Tectona grandis Linn. F.) SEEDLINGS INOCULATED WITH SPORES OF ARBUSCULAR MYCORRHIZAL FUNGI ORIGINATED FROM SOIL IN TEAK FOREST Corryanti, Corryanti; Soedarsono, Joedoro; Radjagukguk, Bostang; Widyastuti, Siti Muslimah
Jurnal Pemuliaan Tanaman Hutan Vol 1, No 2 (2007): Jurnal Pemuliaan Tanaman Hutan
Publisher : Center for Forest Biotechnology and Tree Improvement (CFBTI)

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Abstract

The objective of the study was to determine the effect of arbuscular mycorrhizal fungi collected from soil of teak plantation forest on the growth of teak seedling related to mycorrhizal association development. The study utilized the complete randomized design with three levels of inoculant’s factor, consisting of control (uninoculated), inoculation with Gigaspara spores and inoculation with Glomus spores inoctilated, with ten replications. Spores isolated originated from soil of teakplantation forest in Tangen, Surakarta. The planting medium was a mixture soil sand at 1:1 (v/v) sterilized prior to be used. NPK mixed ferfilizer was applied at amount 0,0625 gr per seeadling mixed in to the planting medium. Measurements were conducted during a five month period. The data were analyzed using the Analysis ofVariance method and differences among treaments analyzed usfing the Duncan’sMultiple Range Test at the 5% ievel of significance. The results showed that inoculationwith the arbuscular mycorrhizail fungi increased teak seedling growth, with Gigaspora sp inoculation giving the highest growth. The uptakes of N, P, K and Ca were increased by both Gigaspora sp and Glomus sp inoculations. The increased seedling growth, was accompanied by large increases in infection percentage as well as sporulation. The highest infection and sporulation  were found with Gigaspora sp inoculation. These results showed that in the soil ofteak plantation forest in Tangen of the grumusol type, relatively low NPK fertilization (0,0625 gr per seedling) and inoculadon with spores ofarbuscular mycorrhizal fungi improved teak seedling growth, inereased nutrient uptake, as well as improved mycorrhizal association development in teak seedlings.
PENGARUH INTERAKSI HARA NITROGEN DAN FOSFOR TERHADAP PERTUMBUHAN TANAMAN JAGUNG (Zea Mays L) PADA TANAH REGOSOL DAN LATOSOL Fahmi, Arifin; Utami, Sri Nuryani H; Radjagukguk, Bostang
BERITA BIOLOGI Vol 10, No 3 (2010)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

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Abstract

Nitrogen (N) and Phosphorus (P) are essential nutrients for plant.The deficiency one of these nutrients will be limiting the plant growth.A glass house experiment with one treatment factor was conducted to study the effect and interaction of N and P fertilizers application on maize growth in regosol and latosol soils. The results show that the interaction of N and P fertilizers application(N 1 P 1) on regosol had a significant influence to plant height on 3 to 7 weeks after planting, whilst on latosol had a significant influence to plant height on 1 to 5 weeks after planting. The shoot dry weight, root dry weight and total dry weight of maize on regosols and latosol soils were significantly influenced by the interaction of N and P fertilizers application (N 1 P 1). There were a positive correlation between N and P fertilizers application on both soils types to the total plant dry weight.
Restorasi Gambut dengan Tiga Jenis Surfaktan, dan Pengaruhnya terhadap Efisiensi Penyimpanan Kation dan Kapasitas Memegang Hidayah Utami, Sri Nuryani; Maas, Azwar; Radjagukguk, Bostang; Purwanto, Benito Heru
Agritech Vol 29, No 1 (2009)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

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Abstract

The experimental study on hydrophobic and hydrophilic peat restoration from Central Kalimantan executed in labo­ ratory using Completely Randomize Design Factorial consist of two factors. The first factor was peat type that is hydrophobic and hydrophilic peat, and the second factor is type of surfactants, those are anionic, ionic and detergent condensation. The study aims at improving the nature of irreversible drying of  hydrophobic peat Kalimantan to be­ come productive again denoted by the depository efficiency fertilizer and water holding capacity. Results of research show the surfactants improve the depository efficiency of cation K+ and Mg2+ and can maintain soil moisture content of dry peat from 20 % becoming 150 %.ABSTRAKPercobaan restorasi gambut hidrofobik dan hidrofilik  dari Kalimantan Tengah dilaksanakan di laboratorium de­ ngan Rancangan Acak Lengkap Faktorial terdiri atas 2 faktor. Faktor I adalah jenis gambut yaitu gambut hidrofobik dan hidrofilik dan faktor kedua adalah jenis surfaktan yaitu anionik, inonik dan larutan deterjen. Tujuan penelitian adalah untuk memperbaiki sifat kering tidak balik (hidrofob) gambut agar dapat produktif lagi yang ditunjukkan de­ ngan efisiensi penyimpanan pupuk (kation) dan kapasitas memegang air (water holding capacity). Hasil penelitian menunjukkan surfaktan meningkatkan efisiensi penyimpanan kation K+ dan Mg2+ dan dapat mengembalikan kelengas­ an gambut yang kering dari 20 % menjadi 150 %.