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2015 Volume 59 Issue 1 Pages
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2015 Volume 59 Issue 1 Pages
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2015 Volume 59 Issue 1 Pages
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Article type: Index
2015 Volume 59 Issue 1 Pages
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H. SUMIDA
Article type: Article
2015 Volume 59 Issue 1 Pages
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Naoya KATSUMI, Koyo YONEBAYASHI, Masanori OKAZAKI
Article type: Article
2015 Volume 59 Issue 1 Pages
2-11
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We investigated the complexation of Al by soil humic acids (HAs) extracted from two Andisols, two Entisols, and an Inceptisol at a constant Al^<3+> concentration at pH 4.0 using batch techniques. The quantity of Al bound to 1 g of soil HAs decreased in the order Andisol HAs >> Entisol HAs ≈ Inceptisol HAs. The quantity of Al bound to HAs showed a highly positive correlation with the degree of humification and the COOH content of the HAs and a highly negative correlation with the H/C atomic ratio of the HAs. Al-HA complexes were found to contain 1 mol of Al and 1 mol of carboxyl groups with acid dissociation constants of <3.2 (dissociated at pH 4.0). The competition for Al between HAs and several chelating agents was investigated; specifically, HAs were added to complexes of Al and iminodiacetic acid (IDA), nitrilotriacetic acid (NTA), oxalic acid, and citric acid. The Al-HA complexes were more stable than the Al-IDA complex and less stable than the Al-NTA, Al-citric acid, and Al-oxalic acid complexes. These results imply that binding strength between Al and HAs is relatively low under acidic condition, suggesting that HAs in the complex are able to perform ligand-exchange with organic acids in acidic soil.
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Ngai Paing TAN, Mum Keng WONG, Yusufujiang YUSUYIN, Arifin Bin ABDU, K ...
Article type: Article
2015 Volume 59 Issue 1 Pages
12-24
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In order to contribute to developing appropriate and efficient schemes for phosphorus fertilizer, the influence of different management practices such as chemical fertilizer application and frond heaping on the distribution of soil phosphorus (P) were investigated in three oil palm fields with planting ages of 5, 10 and 18 years in Pahang, Peninsular Malaysia. Soil samples were collected from the depths of 0-3 cm, 3-10 cm and 30-40 cm at three micro sites in each field, that is, weeded circles, frond heaps and harvest paths. The distribution of soil P varied widely with different management practices; the levels of total P and Bray II P, inorganic NaHCO_3 P and NaOH P, and HCl P at 0-3 cm were higher at the weeded circle than those at the frond heap and harvest path due to continuous P fertilization through which a significant portion of the applied phosphate rocks remained undissolved and was gradually accumulated in soils. Such P accumulation tended to be more obvious in the 18 years field. Meanwhile, the levels of organic P fractions at the frond heap were similar to those at the harvest path and lower than those at the weeded circle. The levels of P at 30-40 cm were not virtually different among the micro sites.
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Kimihiro KIDA
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2015 Volume 59 Issue 1 Pages
25-27
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Article type: Appendix
2015 Volume 59 Issue 1 Pages
28-37
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Article type: Cover
2015 Volume 59 Issue 1 Pages
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Article type: Index
2015 Volume 59 Issue 1 Pages
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