Multi-dimensional evaluation of the nitrogen status of agricultural soils in Japan -analysis of the controlling factors and comparison with other Asian countries

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The contents of effective organic mineralizable nitrogen were evaluated for 147 agricultural soils in Japan based on the mean annual temperature and found to be relatively high at medium temperature regimes. Effects of inorganic and organic fertilizer management on soil nitrogen fractions were evaluated. Soil nitrogen fractions were considerably affected by soil type, land use and soil physic-chemical properties. Soil nitrogen status in Japan was evaluated to be relatively fertile among Asian countries, reflecting temperate climate conditions and influence of volcanic materials.