Articles
<![CDATA[The Dynamics Surface Adsorption of Fe Oxide-Humic Substance Complexes ]]>
<![CDATA[FAHMI, ARIFIN]]>
<![CDATA[ Jurnal Sumberdaya Lahan Vol 5, No 02 (2011): Desember 2011 ]]>
Publisher : <![CDATA[Indonesian Center for Agriculture Land Resource Development ]]>
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<![CDATA[Iron (Fe) oxide is the most abundant metallic oxides in the soils, it is highly reactive so that it has a huge influence on the dynamics of chemical balance in the soil both in terms soil fertility and environmental decontamination from toxic metal. Naturally, the surface of Fe oxide is coated with organic substances in the form of complexes compound, this condition may influence on its reactivity and retention capacity to ions in the soil solution. The presence of humic substances may increase or decrease the adsorption capacity of Fe oxide in which the complexes adsorption capacity is highly dependent on some environmental factors. Complexes formation of Fe oxide â humic substances increase cation adsorption esspecially in very acid condition. Ionic strength tends to influence on cation adsorption only at basic pH condition and the increasing of ionic strength is increased cation adsorption by complexes. Adsoption processes is also influenced by concentration, molecule weight dan type of adsorbent and adsorbate material. The presence of competition between ions and blocking process on adsorption process decreases a number of sorbed ion.]]>
<![CDATA[The Role of Organic Matter to Improve Phosphate Fertilization Efficiency on Acid Sulphate Soil ]]>
<![CDATA[SUSILAWATI, ANI]]>;
<![CDATA[FAHMI, ARIFIN]]>
<![CDATA[ Jurnal Sumberdaya Lahan Vol 5, No 01 (2011): Juli 2011 ]]>
Publisher : <![CDATA[Indonesian Center for Agriculture Land Resource Development ]]>
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<![CDATA[The large amount of acid sulphate soil area may be potential for agricultural development. Low soil pH, low to very low P availability and high Fe concentration are the dominant characteristics of acid sulphate soils. Low availability of P in acid sulphate soil may due to fixation process by iron and aluminum. Low N, low available K, and potential toxicityof Fe and Al are other characteristics of acid sulphate soil. Optimum agricultural management practices are required to leach the excess of Fe2+ and to maximize the P availability in order to obtain favourable conditions for rice growth. Rice straw application is part of technology for acid sulphate soil productivity improvement, a simple tecnology that sustainable and environmental friendly. Organic matter being a source of nutrients has also an important role in relation to P sorption capacity of soils through Fe chelation processes.]]>
<![CDATA[PERAN GAMBUT TERHADAP NITROGEN TOTAL TANAH DI LAHAN RAWA [The Role of Peat on Total Nitrogen in The Wetland Soils] ]]>
<![CDATA[Fahmi, Arifin]]>;
<![CDATA[Radjagukguk, Bostang]]>
<![CDATA[ BERITA BIOLOGI Vol 12, No 2 (2013) ]]>
Publisher : <![CDATA[Research Center for Biology-Indonesian Institute of Sciences ]]>
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DOI: 10.14203/beritabiologi.v12i2.536
<![CDATA[Peatland has important role in wetland ecosystem stability. Depletion and disappearance of peat layer lead to loss of potential source of nutrient and disruption of wetland ecosystem stability. The research aimed to study the influence of peat thickness and land hydrological condition on the total nitrogen (N) content in soil, the influence of rapidly or naturally the depletion and disappear of peat layer on total N content in soil, and the influence of hydrological condition on total N content in soil. Total N was observed in June of 2009 and 2010 (transition from wet to dry season), September of 2009 and 2010 (peak of dry season), and January of 2010 and 2011 (peak of wet season). The research was carried out on potential acid sulphate soil (A), peaty acid sulphate soil (B),shallow peat which all of peat layers wereremoved (C), shallow peat which peat layer was partially removed (D), shallow peat (E), moderate peat (F) and deep peat (G). The results showed that total N content increased with increasing of peat thickness, the depletion and disappearance of peat layer reduced total N content in soil, and declining in the groundwater level increased total N content in soil.]]>
<![CDATA[PENGARUH INTERAKSI HARA NITROGEN DAN FOSFOR TERHADAP PERTUMBUHAN TANAMAN JAGUNG (Zea Mays L) PADA TANAH REGOSOL DAN LATOSOL ]]>
<![CDATA[Fahmi, Arifin]]>;
<![CDATA[Utami, Sri Nuryani H]]>;
<![CDATA[Radjagukguk, Bostang]]>
<![CDATA[ BERITA BIOLOGI Vol 10, No 3 (2010) ]]>
Publisher : <![CDATA[Research Center for Biology-Indonesian Institute of Sciences ]]>
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DOI: 10.14203/beritabiologi.v10i3.744
<![CDATA[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.]]>
<![CDATA[PENGARUH PEMBERIAN JERAMI PADI TERHADAP PERTUMBUHAN TANAMAN PADI (Oryza sativa) DI TANAH SULFAT MASAM ]]>
<![CDATA[Fahmi, Arifin]]>
<![CDATA[ BERITA BIOLOGI Vol 10, No 1 (2010) ]]>
Publisher : <![CDATA[Research Center for Biology-Indonesian Institute of Sciences ]]>
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DOI: 10.14203/beritabiologi.v10i1.2045
<![CDATA[The objective of the experiment was to investigate the effect of rice straw application on the growth of rice in two conditions of acid sulphate soils. An experiment was conducted in the glass house consisting of three treatment factors using the completely randomized design with three replications.The first factor was soil condition consisting of continuous application of rice straw and without application of rice straw during the last 5 years. The second factor was fresh application of rice straw consisting of application and without application, whereas the third factor was P application consisting of 3 rates of SP - 36 fertilizers.Parameters measured were plant height, tiller number and Fe toxicity score. Measurement were conducted at 2, 4, 6 and 8 weeks after planting. Plant dry weight and P concentration in plant tissue were determined at 8 weeks after planting. The result showed the main effect of rice straw application was significant decrease on the tiller number of the rice plant at 2, 4 and 6 weeks after planting, whereas significant on plant height was observed at 2 and 4 weeks after planting. Based on the scoring of degree of Fe toxicity, it was concluded that the rice plant did not exhibit any effect of Fe toxicity.]]>
<![CDATA[The Role of Organic Matter to Improve Phosphate Fertilization Efficiency on Acid Sulphate Soil ]]>
<![CDATA[ANI SUSILAWATI]]>;
<![CDATA[ARIFIN FAHMI]]>
<![CDATA[ Jurnal Sumberdaya Lahan Vol 5, No 1 (2011) ]]>
Publisher : <![CDATA[Indonesian Center for Agriculture Land Resource Development ]]>
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DOI: 10.21082/jsdl.v5n1.2011.%p
<![CDATA[The large amount of acid sulphate soil area may be potential for agricultural development. Low soil pH, low to very low P availability and high Fe concentration are the dominant characteristics of acid sulphate soils. Low availability of P in acid sulphate soil may due to fixation process by iron and aluminum. Low N, low available K, and potential toxicityof Fe and Al are other characteristics of acid sulphate soil. Optimum agricultural management practices are required to leach the excess of Fe2+ and to maximize the P availability in order to obtain favourable conditions for rice growth. Rice straw application is part of technology for acid sulphate soil productivity improvement, a simple tecnology that sustainable and environmental friendly. Organic matter being a source of nutrients has also an important role in relation to P sorption capacity of soils through Fe chelation processes.]]>
<![CDATA[The Dynamics Surface Adsorption of Fe Oxide-Humic Substance Complexes ]]>
<![CDATA[ARIFIN FAHMI]]>
<![CDATA[ Jurnal Sumberdaya Lahan Vol 5, No 2 (2011) ]]>
Publisher : <![CDATA[Indonesian Center for Agriculture Land Resource Development ]]>
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DOI: 10.21082/jsdl.v5n2.2011.%p
<![CDATA[Iron (Fe) oxide is the most abundant metallic oxides in the soils, it is highly reactive so that it has a huge influence on the dynamics of chemical balance in the soil both in terms soil fertility and environmental decontamination from toxic metal. Naturally, the surface of Fe oxide is coated with organic substances in the form of complexes compound, this condition may influence on its reactivity and retention capacity to ions in the soil solution. The presence of humic substances may increase or decrease the adsorption capacity of Fe oxide in which the complexes adsorption capacity is highly dependent on some environmental factors. Complexes formation of Fe oxide – humic substances increase cation adsorption esspecially in very acid condition. Ionic strength tends to influence on cation adsorption only at basic pH condition and the increasing of ionic strength is increased cation adsorption by complexes. Adsoption processes is also influenced by concentration, molecule weight dan type of adsorbent and adsorbate material. The presence of competition between ions and blocking process on adsorption process decreases a number of sorbed ion.]]>
<![CDATA[The Dynamics Surface Adsorption of Fe Oxide-Humic Substance Complexes ]]>
<![CDATA[ARIFIN FAHMI]]>
<![CDATA[ Jurnal Sumberdaya Lahan Vol 5, No 2 (2011) ]]>
Publisher : <![CDATA[Indonesian Center for Agriculture Land Resource Development ]]>
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DOI: 10.21082/jsdl.v5n2.2011.%p
<![CDATA[Iron (Fe) oxide is the most abundant metallic oxides in the soils, it is highly reactive so that it has a huge influence on the dynamics of chemical balance in the soil both in terms soil fertility and environmental decontamination from toxic metal. Naturally, the surface of Fe oxide is coated with organic substances in the form of complexes compound, this condition may influence on its reactivity and retention capacity to ions in the soil solution. The presence of humic substances may increase or decrease the adsorption capacity of Fe oxide in which the complexes adsorption capacity is highly dependent on some environmental factors. Complexes formation of Fe oxide – humic substances increase cation adsorption esspecially in very acid condition. Ionic strength tends to influence on cation adsorption only at basic pH condition and the increasing of ionic strength is increased cation adsorption by complexes. Adsoption processes is also influenced by concentration, molecule weight dan type of adsorbent and adsorbate material. The presence of competition between ions and blocking process on adsorption process decreases a number of sorbed ion.]]>
<![CDATA[The Role of Organic Matter to Improve Phosphate Fertilization Efficiency on Acid Sulphate Soil ]]>
<![CDATA[ANI SUSILAWATI]]>;
<![CDATA[ARIFIN FAHMI]]>
<![CDATA[ Jurnal Sumberdaya Lahan Vol 5, No 1 (2011) ]]>
Publisher : <![CDATA[Indonesian Center for Agriculture Land Resource Development ]]>
Show Abstract
|
Download Original
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DOI: 10.21082/jsdl.v5n1.2011.%p
<![CDATA[The large amount of acid sulphate soil area may be potential for agricultural development. Low soil pH, low to very low P availability and high Fe concentration are the dominant characteristics of acid sulphate soils. Low availability of P in acid sulphate soil may due to fixation process by iron and aluminum. Low N, low available K, and potential toxicityof Fe and Al are other characteristics of acid sulphate soil. Optimum agricultural management practices are required to leach the excess of Fe2+ and to maximize the P availability in order to obtain favourable conditions for rice growth. Rice straw application is part of technology for acid sulphate soil productivity improvement, a simple tecnology that sustainable and environmental friendly. Organic matter being a source of nutrients has also an important role in relation to P sorption capacity of soils through Fe chelation processes.]]>
<![CDATA[The Role of Peat Layers on Iron Dynamics in Peatlands ]]>
<![CDATA[Fahmi, Arifin]]>;
<![CDATA[Radjagukguk, Bostang]]>;
<![CDATA[Purwanto, Benito Heru]]>;
<![CDATA[Hanudin, Eko]]>
<![CDATA[ JOURNAL OF TROPICAL SOILS Vol. 15 No. 3: September 2010 ]]>
Publisher : <![CDATA[UNIVERSITY OF LAMPUNG ]]>
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DOI: 10.5400/jts.2010.v15i3.195-201
<![CDATA[The Role of Peat Layers on Iron Dynamics in Peatlands (A Fahmi, B Radjagukguk, BH Purwanto and E Hanudin): The research aimed to study the effect of peat thickness and humification stage of the peat material on Fe solubility at the peatlands with sulfidic material as substratum. The research was conducted at three conditionals of ombrogen peatlands ie ; deep, moderate and shallow peat. Soil samples were collected by using peat borer according to interlayer (the border layer of peat and mineral layer) and conditional of soil horizons. The sample point depth were (cm) G.s2 : 25, G.s1 : 50, Int.s : 70, M.s1 : 90 and M.s2 : 100 for shallow peat, G.m2 : 47, G.m1 : 100, Int.m : 120 and M.m1 : 135 for moderate peat and G.d3 : 50, G.d2 : 150, G.d1 : 200, Int.d : 220 and M.d1 : 235 for deep peat respectively. The results showed that most of Fe on the tested soils was found in organic forms. The peat layers above the sulfidic material decreased the Fe2+ solubility at peatlands. Fe2+ concentration in peat layer decreased with its increasing distance from sulfidic material. There was any other processes beside complexation and chelation of Fe2+ by humic material and its processes was reduction of Fe3+ and this conditions was reflected in redox potential values (Eh).]]>
