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Studies on the Changes of Soils' Properties of Upland or Paddy Fields with various Productivities. : Part. 9. On nitrogen and carbon contents of humic acids extracted from a series of volcanic ash upland field's top-soils of the four groups and on the ext

机译：不同生产力的旱地或稻田土壤性质变化的研究：第9部分。从四组火山灰高地土壤中提取的腐殖酸的氮和碳含量以及对

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永井恭三 / 平山力 / 福田俊雄; ナガイキョウゾウ / ヒラヤマチカラ / フクダトシオ; NAGAI kyozo / HIRAYAMA chikara / FUKUDA toshio;
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年度 1963
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6. Studies on the Changes of Soils' Properties of Upland or Paddy Fields with Increasing- Productivities : XI. On the acid soluble and aluminum phosphate-phosphorus contents in a series of volcanic ash upland fields' top soils of the four groups [O] . 永井恭三, ナガイキョウゾウ, NAGAI kyozo 1964

机译：生产率提高对旱地或稻田土壤性质变化的研究：XI。四组火山灰旱地土壤中酸溶性和磷酸铝磷含量的变化

Studies on the Changes of Soils' Properties of Upland or Paddy Fields with various Productivities. : Part. 9. On nitrogen and carbon contents of humic acids extracted from a series of volcanic ash upland field's top-soils of the four groups and on the ext

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