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- [2] SOIL TESTS FOR ZINC, IRON, MANGANESE, AND COPPER CALIFORNIA AGRICULTURAL EXPERIMENT STATION BULLETIN, 1978, (1879): : 40 - 42
- [3] MICRONUTRIENT SOIL TESTS - ZINC, IRON, MANGANESE AND COPPER NORTH DAKOTA AGRICULTURAL EXPERIMENT STATION BULLETIN, 1980, (499): : 18 - 21
- [5] COPPER, ZINC, MANGANESE AND IRON EXTRACTABLE FROM SOIL BY ATOMIC-ABSORPTION SPECTROPHOTOMETRY AGROCHIMICA, 1973, 17 (05): : 413 - 423
- [7] Effect of soil dunging on absorption of iron, copper, zinc and manganese AGROCHIMICA, 1995, 39 (5-6): : 316 - 325