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- [6] RELATIVE EFFICIENCY OF SULFUR COATED UREA, UREA AND AMMONIUM-SULFATE IN A CALCAREOUS SOIL TROPICAL AGRICULTURE, 1974, 51 (04): : 515 - 522
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- [8] NITRIFICATION POTENTIAL OF 5 SOILS AMENDED WITH UREA AND AMMONIUM-SULFATE ZENTRALBLATT FUR MIKROBIOLOGIE, 1993, 148 (07): : 523 - 527
- [9] UREA, AMMONIUM-SULFATE AND DICYANDIAMIDE TRANSFORMATIONS IN COSTA RICAN SOILS FERTILIZER RESEARCH, 1987, 12 (03): : 255 - 261