Abstract
We examined the chemistry and fertility of Japanese Andisols in relation to clay mineralogical composition and subsoil acidity.
Japanese Andisols may be divided into two groups according to clay mineralogical composition: allophanic Andisols dominated by allophane and imogolite, and nonallophanic Andisols dominated by 2: 1 minerals.
Both types exhibit the unique chemical and physical properties of Andisols such as accumulation of organic carbon, high concentration of active-AI, high phosphate retention, variable charge characteristics, and low bulk density. There are significant differences, however, between allophanic and nonallophanic Andisols. In particular, nonallophanic Andisols have active-AI dominated by AI-humus complexes, some values of constant charge is present, and they have high acidity as shown by low values of pH and high values of KCl-extractable AI. Among these properties, soil acidity is the most important problem for upland farming.
Barley grown in nonallophanic Andisols showed symptoms of AI-toxicity and growth was much inferior to that in allophanic Andisols. This is attributed to insufficient uptake of nitrogen due to poor rooting in the acid subsoils of nonallophanic Andisols.
Split application of basal N and the use of slow release N were effective in improving the grain yield and N uptake of barley grown on nonallophanic Andisols.
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Saigusa, M., Matsuyama, N., Honna, T., Abe, T. (1991). Chemistry and fertility of acid Andisols with special reference to subsoil acidity. In: Wright, R.J., Baligar, V.C., Murrmann, R.P. (eds) Plant-Soil Interactions at Low pH. Developments in Plant and Soil Sciences, vol 45. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-3438-5_8
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DOI: https://doi.org/10.1007/978-94-011-3438-5_8
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