[1]
M. I. H. Díaz, V. M. González, M. G. Hurtado, J. M. S. Pulido, e A. O. Velóz, “Nitrogen levels and their fractioning in gladiolus cultivation for Ferralitic Red soils”, Pesq. Agrop. Bras., vol. 43, nº 1, p. 21–27, jan. 2008.