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		Niklah, W., 		Madrini, I., & 		Wijaya, I.
2019 Jun 19.  Keragaman Unsur Hara Nitrogen pada Lahan Sawah di Desa Maduran, Kecamatan Maduran, Kabupaten Lamongan Jawa Timur. Jurnal Ilmiah Teknologi Pertanian Agrotechno. [Online] 4:1