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Aiilawat, A.S. and Dagar, J.C. 1980. Effect Of N, P and K Fertilizers on Growth Performance and Phosotynthetic Pigments of <I>Bidens biternata</I> (Lour.) Merr. & Sherff. Indian Forester. 106, 10 (Oct. 1980), 752–757. DOI:https://doi.org/10.36808/if/1980/v106i10/11261.