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- [7] EFFECT OF CROP ROTATIONS ON SOIL FERTILITY INDIAN JOURNAL OF AGRICULTURAL SCIENCES, 1979, 49 (04): : 276 - 280
- [9] Influence of epigeal earthworms on quality of composts and their effect on crop yields, soil fertility and biological activities ENVIRONMENT AND CROP PRODUCTION, 2002, : 313 - 326
- [10] INFLUENCE OF BEET VINASSES ON CROP YIELD, STRAW ROTTING AND SOIL FERTILITY LANDWIRTSCHAFTLICHE FORSCHUNG, 1985, 38 (04): : 317 - 327