1. Ayres M, Ayres M Jr, Ayres DL, Santos AS (2007) BioEstat 5.0: aplicações estatísticas nas áreas das ciências biológicas e médicas. MCT; IDSM; CNPq, Belém (In Portuguese)
2. Beyrouty CA, Wells BR, Norman RJ, Marvel JN, Pillow JA Jr (1987) Characterization of rice roots using a minirhizotron technique. In: Taylor HM (ed) Minirhizotron observation tubes: methods and applications for measuring rhizosphere dynamics. ASA, CSSA, SSSA, Madison, pp 99–108
3. Donagema GK, Campos DVB, Calderano SB, Teixeira WG, Viana JHM (2011) Manual de métodos de análise de solo. 2.ed. (Documento, 132). Embrapa Solos, Rio de Janeiro (In Portuguese)
4. Drescher GL, Roberts TL, Norman RJ, Slaton NA, Silva LS (2019) Quantifying clay-fixed ammonium in paddy soils and determining its availability using alkaline distillation. Soil Sci Soc Am J 83(3):800–807. https://doi.org/10.2136/sssaj2018.11.0436
5. Drescher GL, Silva LS, Sarfaraz Q, Drescher MS, Brunetto G, Silva AAK, Tassinari A, Silva LOS (2020) Rice nitrogen uptake as affected by different nitrogen application depths. Arch Agron Soil Sci 66:1–13. https://doi.org/10.1080/03650340.2019.1711064