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All Journal Journal of Tropical Soils Jurnal Sumberdaya Lahan BERITA BIOLOGI Jurnal Sumberdaya Lahan
ARIFIN FAHMI
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Environmental Science

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Journal : Jurnal Sumberdaya Lahan

 1 
The Dynamics Surface Adsorption of Fe Oxide-Humic Substance Complexes ARIFIN FAHMI
Jurnal Sumberdaya Lahan Vol 5, No 2 (2011)
Publisher : Indonesian Center for Agriculture Land Resource Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (482.776 KB) | DOI: 10.21082/jsdl.v5n2.2011.%p

Abstract

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.
The Role of Organic Matter to Improve Phosphate Fertilization Efficiency on Acid Sulphate Soil ANI SUSILAWATI; ARIFIN FAHMI
Jurnal Sumberdaya Lahan Vol 5, No 1 (2011)
Publisher : Indonesian Center for Agriculture Land Resource Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jsdl.v5n1.2011.%p

Abstract

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.
Co-Authors Ani Susilawati Benito Heru Purwanto Bostang Radjagukguk Dedi Nursyamsi Eko Hanudin Muhammad Alwi Rachman, Ahmad Utami, Sri Nuryani H