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		Niklah, W., 		Madrini, I., & 		Wijaya, I.
(2019).
 Keragaman Unsur Hara Nitrogen pada Lahan Sawah di Desa Maduran, Kecamatan Maduran, Kabupaten Lamongan Jawa Timur.
<em>Jurnal Ilmiah Teknologi Pertanian Agrotechno, 4</em>(1), 16-23.
doi:10.24843/JITPA.2019.v04.i01.p03