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3. Presence and Persistence of Phytotoxic Substances in Wheat, Oat, Corn, and Sorghum Residues
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4. D.B. Habeshaw(1979 ) Indigenous growth and germination inhibitors in grasses and their role in grass survival and pasture establishment .British Grassland Society, Papers presented at Winter Meeting 1979, pp.9.1 -9.3 .