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- [32] EFFECT OF ADDITION OF COMPOUNDS OF COPPER, MANGANESE, ZINC, CHROMIUM, AND CALCIUM ON EXTRACTABLE IRON FROM SOIL INCUBATED UNDER AEROBIC AND ANAEROBIC CONDITIONS AGROCHIMICA, 1971, 15 (2-3): : 202 - +
- [34] CHANGES IN DTPA-EXTRACTABLE ZINC, IRON, MANGANESE, AND COPPER IN SOILS FOLLOWING FERTILIZATION SOIL SCIENCE SOCIETY OF AMERICA PROCEEDINGS, 1971, 35 (04): : 600 - +
- [35] Simultaneous extraction of copper, zinc, iron and manganese in the soil of the loessic high pampas of Cordoba, Argentina AGROCHIMICA, 2002, 46 (06): : 241 - 252