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All Journal Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Jurnal Tanah dan Iklim JURNAL PERTAMBANGAN
K. Idris
Fakultas Pascasarjana, Institut Pertanian Bogor, Kampus IPB Darmaga, Bogor
Agriculture, Biological Sciences & Forestry Economics, Econometrics & Finance

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COMPOSITION OF PHOSPHORUS FRACTION ON PEAT ADDED WITH MINERAL SOIL AMELIORANT AND P FERTILIZATION HARTATIK, WIWIK; IDRIS, K.; SABIHAM, SUPIYANDI; DJUNIWATI, S.; ADININGSIH, J. SRI
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 21 (2003): Desember 2003
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n21.2003.%p

Abstract

Most of P on peat is in the form of organic P. Composition of P on peat, especially organic P, is rarely studied. Therefore fractionation of P on peat is important to know the proportion of inorganic and organic P and available P. The aim of the experiment was to study the composition of P added with mineral soil ameliorant and P fertilization. The experiment was conducted in the laboratory of the Indonesian Center for Soil and Agroclimate Research and Development, Bogor. Two hundreds g peat dry weight (105o) added with mineral soil ameliorant in the rate of 7.5% maximum Fe sorption which is equal to 10.4 g pot-1. The mixture of peat and mineral soil (Oxisols) was then added with P fertilizer and followed by incubation for 4 weeks. After incubation, the mixture was fractioned for P. P treatment consisting of four P fertilizer sources that are Maroko rockphosphate, Christmas rock phosphate, Ciamis rock phosphate and SP-36. Four P levels are 25, 50, 75, and 100% of P sorption plus partial complete control, and replicated two times. Composition of P in this study that is readily labile, moderately labile, and non labile. P fraction determinated with sequential extraction based on the method had been used by Ivanoff. The results showed that peat from Air Sugihan Kiri, South Sumatrawas poor (oligotropyc), acidic, and low exchangeable K and ash content. Most of P on the peat was in the proportion of organic P (around 77 up to 95%) and the rest was in a small amount, inorganic P (10 up to 23%). The composition of P organic fraction showed that the non labile was relatively the same P proportion with moderately labile, meanwhile the readily labile was low. Source and rock phosphate level did not affect theproportion of organic P. The application of Maroko and Ciamis rock phosphates at the level of 100% of P sorption increased available P (readily P inorganic). Non-labile inorganic P proportion from Christmas rock phosphate was higher than those from Maroko and Ciamis.
EFFECT OF OXALIC ACID, NA+, NH4 +, AND FE3+ ON AVAILABILITY OF SOIL K, PLANT N, P, AND K UPTAKE, AND MAIZE YIELD IN SMECTITIC SOILS NURSYAMSI, DEDI; IDRIS, K.; SABIHAM, SUPIYANDI; RACHIM, D.A; SOFYAN, AGUS
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 28 (2008): Desember 2008
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n28.2008.%p

Abstract

Smectitic soils have high prospect to be developed for agricultural land under a proper soil and plant management. The soils are commonly high in total K content. It?s availability for plant growth, however, is relatively low due to fixation by smectite in interlayer space. Researches aimed to study the effect of oxalic acid, Na+, NH4+, and Fe3+ on availability of soilK, plant N, P, and K uptake, as well as maize yield in smectitic soils have been conducted in Laboratory of Research and Soil Test and Green House of Indonesian Soil Research Institute, Bogor. Four different types of bulk soil samples taken from Bogor (Typic Hapludalfs), Cilacap (Chromic Endoaquerts), Ngawi (Typic Endoaquerts), and Blora (Typic Haplustalfs) were used for experiments. Incubation and pot experiments were set up using Factorial Randomized Completely Block Design with three replication and pot experiment used maize of Pioneer 21 variety as plant indicator. The first factor was oxalic acid rates: 0; 1,000; 2,000; and 4,000 ppm, while the second one was application of cations: without cation, Na+, NH4+, and Fe3+ from NaCl, NH4Cl, and FeCl3 respectively with 50% of maximum adsorption rate. The Fe3+ with 50% of maximum adsorption rate caused plant death, thus the experiment was repeated in the nextseason with Fe3+ rates: 0, 125, 250, 375, and 500 ppm. The results showed that oxalic acid, Na+, NH4+, and Fe3+ significantly increased the availability of soil K in both Alfisols and Vertisols where the effect was higher in Vertisols than Alfisols. The effectiveness of the treatments to release K from non available to available K form in the soils was in order of Fe3+ > NH4+ > Na+ > oxalic acid. Oxalic acid significantly increasedplant N, P, and K uptake in Vertisols, while 125 ppm of Fe3+ significantly increased plant K uptake in Alfisols as well as N, P, and K uptake in Vertisols. Oxalic acid significantly increased 4- week-after-planting biomass dry yield in Typic Hapludalfs and Typic Endoaquerts, while 125 ppm of Fe3+ significantly increased the yield in Chromic Endoaquerts and Typic Endoaquerts.
Keselarasan Penyediaan Nitrogen dari Pupuk Hijau dan Urea dengan Pertumbuhan Jagung pada Inceptisol Darmaga Wawan, ,; Sabiham, S.; Idris, K.; Djajakirana, G.; Anwar, S.
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 35 No. 3 (2007): 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 (128.549 KB) | DOI: 10.24831/jai.v35i3.1326

Abstract

Increasing N use efficiency and decreasing N pollution can be achieved by synchronization between supplying pattern of N and crop N demand. Leaching-incubation experiment had been carried out for evaluating supplying pattern of N from 14 treatments of green manure (Flemingia and Gliricidia), urea and their combinations. Only 5 treatments of the split application of Gliricidia, urea and their combinations, and single application of combination of  urea and Gliricidia synchronize with corn N uptake model. These five fertilization treatments were further examined in the greenhouse and in the field experiment. The synchronization between supplying pattern of N and corn growth in treatment without leaching was resulted by application of urea at planting followed by Gliricidia at 3 weeks after planting (WAP) and urea at planting and 3 WAP, whereas in treatment with leaching were resulted by split application of Gliricidia at planting and 3 WAP, urea at planting followed by Gliricidia at 3 WAP, and single application of urea and Gliricidia at planting. Urea applied at planting followed by Gliricidia at 3 WAP resulted in the high production of seed dry-weigh  with low N inorganic leaching.   Key words: Synchronization, nitrogen, green manure, urea, corn
HASIL DAN MUTU BENIH KEDELAI (Glysine max (L.) Merr.) DENGAN BUDIDAYA BASAH Raka, I. G. N.; Mugnisjah, W. Q.; Wiroatmodjo, J.; Idris, K.
Jurnal Agronomi Indonesia (Indonesian Journal of Agronomy) Vol. 23 No. 1 (1995): Buletin Agronomi
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 (811.73 KB) | DOI: 10.24831/jai.v23i1.1622

Abstract

Field experiment for soybean seed production was carried out in Darmaga Experimental Station from June to September 1992. Three varieties of soybean, namely Lokon, Wilis, and Amerikana (early, middle, and late maturity, respectively) were planted both by saturated and conventional soil culture. Seed quality testing was carried out in the Laboratory of Seed science and Technology at IPB, Bogor, from September to October 1992. Yield components and seed production of the three varieties showed the same pattern in both saturated and conventional soil culture. Seed quality of Lokon and Wilis varietieswere higher than that of Amerikana in both cultivations. This was due to the less field weathering experienced by Lokon and Wilis varieties. Compared to the conventional soil culture, the saturated soil culture improved the yield components, seed production, and performance of seed physical and physiological quality of the three varieties.
ESTIMASI SUMBERDAYA BATUBARA MENGGUNAKAN METODE CIRCULAR, STUDI KASUS: DAERAH TANJUNG PALAS TENGAH, KALIMANTAN UTARA Wakila, M. H.; ., Anshariah; Heriansyah, A. F.; Idris, K.
Jurnal Pertambangan Vol. 7 No. 3 (2023): Agustus 2023
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v7i3.1586

Abstract

Indonesia merupakan negara yang memiliki sumberdaya alam berlimpah, satu satunya adalah batubara. Untuk mengetahui jumlah sumberdaya batubara diperlukan metode estimasi yang sesuai dengan karakteristik endapan batubara, sehingga dipilih Metode Circular. Pada penelitian-penelitian sebelumnya yang mengkaji tentang estimasi sumberdaya menggunakan Metode Circular hanya difokuskan pada kondisi geologi sederhana dan daerah Kutai Kartanegara, Kalimantan Timur. Namun belum ditemukan penggunaan Metode Circular untuk mengestimasi sumberdaya batubara di daerah Kalimantan Utara dengan kondisi geologi moderat. Tujuan dari penelitian ini adalah untuk menentukan arah sebaran batubara dan mengestimasi sumberdaya batubara di daerah penelitian. Metode yang digunakan untuk mengestimasi sumberdaya batubara adalah Metode Circular. Metode Circular adalah metode dengan bentuk lingkaran dengan radius lingkaran merupakan jarak informasi terluar sebagai batas (area of influence) sesuai dengan ketetapan SNI 5015:2011. Berdasarkan hasil penelitian dapat diketahui bahwa kondisi geologi daerah penelitian dikategorikan ke dalam kondisi geologi moderat. Hal ini bisa dilihat dari aspek sedimentasi yaitu ketebalan lapisan cukup bervariasi, dan kesinambungan lapisan batubara sampai ratusan meter. Aspek tektonik menunjukkan adanya sesar namun cukup jarang, lapisan terlipat sedang, dan kemiringan sedang. Kualitas batubara di daerah penelitian cenderung bervariasi. Dapat disimpulkan bahwa arah sebaran batubara berarah tenggara-barat laut N 325° NE dan nilai dip sebesar 25°. Jumlah sumberdaya batubara terukur adalah 1.293.358,982 ton, sumberdaya batubara tertunjuk adalah 2.931.825,371 ton, serta sumberdaya batubara tereka adalah 7.196.119,244 ton.
Co-Authors , Wawan ., Anshariah Agus Sofyan D.A RACHIM Dedi Nursyamsi G. Djajakirana Heriansyah, A. F. I. G. N. Raka J. SRI ADININGSIH J. Wiroatmodjo S. Anwar S. DJUNIWATI S. Sabiham SUPIYANDI SABIHAM W. Q. Mugnisjah Wakila, M. H. Wiwik Hartatik