KOREH, Agabus Ary; WIDOWATI; JULIANTO, Reza Prokoso Dwi. Long-term residual effects of biochar from tobacco scraps on red spinach (Amaranthus tricolor) growth in Entisols: a five-year field experiment with urea fertilizer addition. Jurnal Ilmiah Pertanian, [S. l.], v. 20, n. 2, p. 153–164, 2023. DOI: 10.31849/jip.v20i2.13451. Disponível em: https://journal.unilak.ac.id/index.php/jip/article/view/13451. Acesso em: 6 nov. 2026.