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A. S. Aiilawat and J. C. Dagar, “Effect Of N, P and K Fertilizers on Growth Performance and Phosotynthetic Pigments of <I>Bidens biternata</I> (Lour.) Merr. & Sherff”., Indian Forester, vol. 106, no. 10, pp. 752–757, Oct. 1980.