 ผลงานตีพิมพ์ในวารสารวิชาการIron oxides in tropical soils on various parent materialsผู้แต่ง: Wiriyakitnateekul, W,  Ms.Anchalee Suddhiprakarn, Emeritus Professor , Mr.Irb Kheoruenromne, Emeritus Professor , Smirk, MN, Gilkes, RJ, วารสาร: 
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ผลงานตีพิมพ์ในวารสารวิชาการDissolution of K, Ca, and P from biochar grains in tropical soilsผู้แต่ง:Limwikran, T., Mr.Irb Kheoruenromne, Emeritus Professor, Ms.Anchalee Suddhiprakarn, Emeritus Professor, Dr.Nattaporn Prakongkep, Lecturer , Gilkes, R.J., วารสาร:  |
ผลงานตีพิมพ์ในวารสารวิชาการThe selection of mixed microbial inocula in environmental biotechnology: Example using petroleum contaminated tropical soilsผู้แต่ง:Dr.Savaporn Supaphol, Assistant Professor, Dr.Supamard Panichsakpatana, Emeritus Professor, Dr.Savitr Trakulnaleamsai, Assistant Professor, Dr.Nipon Tungkananuruk, Associate Professor, Roughjanajirapa, P, O'Donnell, AG, วารสาร: |
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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Electrochemical Properties of Humid Tropical Soils) ผู้เขียน:Krasinth Sutthithammoh สื่อสิ่งพิมพ์:pdf AbstractSoil colloids of the humid tropics exhibit electrochemical properties which are characterized by colloids of constant surface potential type, whereas soils of temperate regions are characterized by colloids bearing a permanent surface charge model. Electrochemical charges of humid tropical soils. Naturally, are controlled by the pH, types of clay mineral, organic matter, and oxides of Fe and Al. So far, some of Thailand’s soils have been found to be of constant surface potential type. In general, the field soil pH values are higher than the pH at P.Z.C. (the point of zero charge or pH P.Z.C, and the pH P.Z.C.) values of top soils are lower than the pH P.Z.C. values of the same sub-soils. C.E.C. (cation exchange capacity) evaluation for soils, of which colloids are of constant surface potential type, as determined by ammonium acetate at pH 7 or barium saturation method at pH 8.2 gives an arbitrary value of C.E.C. and should be over estimated values. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Influences of Green Manures and N-fertilizer Management on Nutrient Uptakes and Yield of Cassava on a Degraded Sandy Soil) ผู้เขียน:Pimprapa Sinkumkoon, ดร.ศุภิฌา ธนะจิตต์, รองศาสตราจารย์ , ดร.สมชัย อนุสนธิ์พรเพิ่ม, รองศาสตราจารย์ , นายเอิบ เขียวรื่นรมณ์, ศาสตราจารย์เกียรติคุณ, Preecha Petprapai, Roongnapa Bowichean สื่อสิ่งพิมพ์:pdf AbstractThe effects of green manures combined with nitrogen fertilizer rates on cassava was studied on a Warin soil, having a very sandy nature, in Nakhon Ratchasima province. Three treatments comprising ruzi grass, sun hemp and no green manure incorporation (local weeds) as a control, were tested in a split-plot design. Four nitrogen rates (0, 7.5, 15 and 22.5 kg.rai-1 N) as subplots were also studied. Ruzi grass as well as local weeds (mainly jungle rice, crabgrass and goat buttons) contained the highest potassium content of 2.32 and 2.16%, respectively, whereas sun hemp consisted of the highest nitrogen content (2.11%). The amounts of available nitrogen released from ruzi grass and sun hemp were almost identical (74.69–75.55 mg.kg-1) and significantly higher than that obtained from local weeds (55.72 mg.kg-1). Green manure had a clear effect on the cassava yield and plant nutrient uptake whereas N fertilizer had none. Sun hemp and local weed gave the highest fresh tuber yield (4.01 and 3.65 t.rai-1) and above-ground biomass (1.34 and 1.13 t.rai-1) of cassava while the starch content was likely to be low, especially in the case of using sun hemp as green manure (30.83%). The cassava yield and above-ground biomass tended to increase with no significant difference but the starch content significantly decreased with increasing rates of N fertilizer. Nitrogen applied at the rate of 22.5 kg.rai-1 N gave the highest fresh tuber yield of 3.50 t.rai-1 of the nitrogen only treatments. Sun hemp green manuring followed by the application of N fertilizer at the rate of 15 kg.rai-1 N gave the significantly highest fresh tuber yield of 4.35 t.rai-1 while the lowest amount of 2.13 t.rai-1 was produced by the plot using ruzi grass as green manure without any additional N fertilizer. |
ที่มา:Agricultural Science Journal (วารสารวิทยาศาสตร์เกษตร)หัวเรื่อง:การดูดซับประจุของดินดอนที่พัฒนามาจากหินกลุ่มแกรนิต บริเวณชายฝั่งทะเลตะวันออกเฉียงใต้ของประเทศไทย |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Contents of Elements in Some Flooded Soils to Their Origins in Northeast Thailand) ผู้เขียน:ดร.ศุภิฌา ธนะจิตต์, รองศาสตราจารย์, นางสาวอัญชลี สุทธิประการ, ศาสตราจารย์เกียรติคุณ, นายเอิบ เขียวรื่นรมณ์, ศาสตราจารย์เกียรติคุณ, R.J. Gilkes สื่อสิ่งพิมพ์:pdf AbstractThe contents of elements in two flooded soils in Northeast Thailand were studied. Aeric Endoaqualf (P1) was derived from fine-grained sedimentary rocks and Typic Endoaquert (P2) developed on basalt. The concentration of elements (Ti, Fe, Ca, Mg, K, Mn, P, Li, Cs, As, Cr, V, Ni, Rb, Cu, Zn, Ga, Co, Pb, Mo, Zr, U, Sr) in the fine-earth, sand, silt and clay fractions was measured by using XRF and ICP-MS techniques. The results revealed that both soils were deep and alkaline. The 2:1 phyllosilicate clay dominated in clay fraction with minor amount of kaolin. Illite and smectite were major clay minerals in P1 and P2, respectively, which were influenced by their parent materials. Authigenesis of clay and carbonate was evident. The amount of elements was quite low throughout the profiles. This was probably due to the shallow water table and these soils had been saturated with water where the reducing condition restricted the weathering rate of the parent rocks. Additionally, there was limited vertical leaching as compared to lateral water flow. However, P1 showed a larger variation of element compositions than did P2, reflecting a more uniform composition of basalt. The distribution of elements showed that their concentrations were generally high in the clay fraction indicating that the clay played an important role as a reservoir for these elements and heavy metals in soils. |
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