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		Niklah, Wahyuni Mawadatin, 		Madrini, Ida Ayu Gede Bintang, AND 		Wijaya, I Made Anom Sutrisna.
" Keragaman Unsur Hara Nitrogen pada Lahan Sawah di Desa Maduran, Kecamatan Maduran, Kabupaten Lamongan Jawa Timur" <em>Jurnal Ilmiah Teknologi Pertanian Agrotechno</em> [Online], Volume 4 Number 1 (19 June 2019)