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BAMBANG HENDRO PRASETYO
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Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences

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The Characteristics of Rice Soils Derived from Alluvial Deposite and their Management BAMBANG HENDRO PRASETYO; DIAH SETYORINI
Jurnal Sumberdaya Lahan Vol 2, No 1 (2008)
Publisher : Indonesian Center for Agriculture Land Resource Development

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jsdl.v2n1.2008.%p

Abstract

Rice soils derived from alluvial deposite were spread almost in all Indonesian archipelago, due to the fact that the parent materials were resulted from sedimentation processes after erosion or weathering either in the upper course of river or the higher place, from the far or short distance. Generally the more distance of sediment material from the source of erosion or weathering, the more variation in the properties, and the closer of sediment material from the source of erosion or weathering, the more homogeny of the sediment material properties. The content and kind of weatherable mineral which were act as important source of nutrient inthe rice soils were influenced by parent materials. Among the parent materials, the sediment from intermediate to basic volcanic materials was the best supplier of nutrients. The most constrain in the alluvial rice soils are acidity and the nutrient content or source of nutrients. A balanced fertilizing based on soil testing is the best way to manage alluvial rice soils. For the area which is already had P and K nutrient status map at 1:50,000 scale, the fertilizing recommendation of primer macro nutrients could be refered to the map, while for the area that do not has a P and K nutrient status, the soil testing analyses should be done. Return straw to the ricefield is strongly recommended, because returned straw could be thrifty application of fertilizer, especially kalium (K).
Properties of Low Activity Clay Soils from South Kalimantan BAMBANG HENDRO PRASETYO; NATA SUHARTA
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 22 (2004): Desember 2004
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n22.2004.%p

Abstract

Soils with low activity clay is one of the problem soils in Indonesia. These soils consisted of Ultisols, Oxisols, Alfisols, and some Inceptisols, occupied about 34.5% of total Indonesian land, distributed in almost all Indonesian islands, and derived from various parent materials. To evaluate the properties of low activity clay soils, 6 pedons of Oxisols and Inceptisols, derived from clay stone, andesitic rock, ultra mafic rock and lime stone,from South Kalimantan were studied both in the field and in the laboratory. The analyses consisted of texture, organic carbon content, pH (H2O and KCl), potential P and K, available P, P retention, exchangeable bases and acidity, cation exchange capacity and mineralogical composition. The results showed that low activity clay dominated by opaque and quartz as primarilyresistant mineral. Clay fraction was dominated by kaolinite, and to a lesser extent goethite, hematite, and gibbsite were also present. The mineralogical composition of the low activity soils indicated a low natural potential nutrient reserve and an advanced stage of soil weathering. Chemically, the low activity clay soils were acid, low content of bases, low cation exchange capacity, high P retention, and some of them show a high aluminum saturation. A complete fertilizer application is necessary for a sustainable use. Although soil fertility constraints on the low activity clay soils can be corrected by liming and appropriate fertilization, socioeconomic condition of the local farmer is another constraint.
Critical Limit of Mercury and Cadmium on Typic Dystrudepts and Typic Hapluderts of Paddy Field HUSEIN SUGANDA; ANTONIUS KASNO; BAMBANG HENDRO PRASETYO
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 24 (2006): Desember 2006
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n24.2006.%p

Abstract

Industrial wastes may pollute agricultural land, which is leading to the contamination of agricultural yield by heavy metals. The pollution of Mercury (Hg) and Cadmium (Cd) on paddy field on rice growth is hard to observe, but the contents of Mercury (Hg) and Cadmium (Cd) on hulled-rice exceed the safety level. Therefore Research should be conducted to study the critical limit of Hg and Cd in soils from paddy field. Soil polluted by Hg and Cd should be remediated physically, chemically, or biologically before it is used for agricultural land. The objectives of the study were to know the effect of heavy metal on harvest yields; to find out the relationship between the contents of Mercury and Cadmium in the soil and in rice, and to determine the critical level of Hg and Cd in the soil. The study was preceded at the laboratory for determining maximum adsorption of Mercury and Cadmium by soil, and then at green house using pots containing Typic Dystrudepts and Typic Hapluderts as muchas 7.5 kg of dry soil. Each pot was given treatments of Mercury and Cadmium with the rate of ; 0, 0.1, 0.2, 0.4, and 0.6 of maximum adsorption by soil, afterward stired and incubated for seven days. Each pot was planted with rice IR-64 as indicator plant. This experiment used Randomised Completely Design with three replicates. The research results showed that the increase of Hg content in soil does not decrease unhulled-rice yield, on the contrary the increase of Cd in soil decreases hulled-rice. Coefficient of correlation (r) between Mercury content in soil and in hulled-rice is 0.79 and 0.94 respectively, while for Cadmium is 0.98 and 0.97. The critical limit of Mercury content in Typic Hapluderts and Typic Dystrudepts is 7.1 and 13.6 mg kg-1 respectively, while the critical limit of Cadmium in Typic Hapluderts and Typic Dystrudepts is 3.9 and 6.9 mg kg-1.
Ultisols from Andesitic Volcanic Materials: the Differentiation in Fertility and Management Potential BAMBANG HENDRO PRASETYO; DJAJA SUBARDJA; B. KASLAN
Jurnal Tanah dan Iklim (Indonesian Soil and Climate Journal) No 23 (2005): Desember 2005
Publisher : Balai Besar Penelitian dan Pengembangan Sumberdaya Lahan Pertanian

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21082/jti.v0n23.2005.%p

Abstract

Ultisols from andesitic volcanic material in lower slope of Mt. Ungaran are different from other Ultisols, especially in their exchangeable aluminum content, P nutrient status (retention and available P), and mineralogy of sand fraction which is dominated by opaque mineral. Interpretation results of physical, chemical, and mineralogical data from six representative soil profiles inform that Ultisols in the reconnaissance map of Central Java consist of three groups: (1) Oxisols (pedons P1 and P2) due to their clay CEC of < 16 cmolc kg-1, even though the soil structure is angular blocky, (2) Ultisols (pedons P3, P4, and P5), and (3) transition from Inceptisols to Ultisols (pedon P6) due to the unclear argillic horizon and broad form of x-ray diffraction pattern. Domination of opaque mineral indicates that nutrient retention is low for a long time. Exchangeable aluminum in the first and second group are very low and not detectable, except in the third group. Available P in the first group is moderate, while in the second group is low (P3 and P5) and high in P4. This condition indicates that theavailable P is influenced not only by aluminum but also by other factors needed to be further studied. Low available P in the third group is due to fixation of P by aluminum. Based on the soil fertility characteristics, mineralogy, and pedogenesis of every group, development of tree crops (such as rubber) in the second group should consider to overcome clay accumulation (or argilic horizon) which may constrain root development. The first group needs addition of organic matter to increase nutrient retention and improve soil stucture.
Co-Authors ANTONIUS KASNO B. KASLAN Diah Setyorini DJAJA SUBARDJA HUSEIN SUGANDA NATA SUHARTA