Título:	Cover crops and nitrogen fertilization effects on nitrogen soil fractions under corn cultivation in a no-tillage system
Autor(es):	Veras, Márcia de Sousa Ramos, Maria Lucrécia Gerosa Oliveira, Daiana Nara Santos Figueiredo, Cícero Célio de Carvalho, Arminda Moreira de Pulrolnik, Karina Souza, Kleberson Worslley de
Assunto:	Solos - manejo Plantas - nutrição
Data de publicação:	2016
Editora:	Sociedade Brasileira de Ciência do Solo
Referência:	VERAS, Márcia de Sousa et al. Cover crops and nitrogen fertilization effects on nitrogen soil fractions under corn cultivation in a no-tillage system. Revista Brasileira de Ciência do Solo, Viçosa, v. 40, e0150092, 2016. Disponível em: <http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100508&lng=en&nrm=iso>. Acesso em: 13 mar. 2018. Epub Apr 29, 2016. doi: http://dx.doi.org/10.1590/18069657rbcs20150092.
Abstract:	The use of cover crops has recently increased and represents an essential practice for the sustainability of no-tillage systems in the Cerrado region. However, there is little information on the effects of nitrogen fertilization and cover crop use on nitrogen soil fractions. This study assessed changes in the N forms in soil cropped to cover crops prior to corn growing. The experiment consisted of a randomized complete block design arranged in split-plots with three replications. Cover crops were tested in the plots, and the N topdressing fertilization was assessed in the subplots. The following cover species were planted in succession to corn for eight years: Urochloa ruziziensis, Canavalia brasiliensis M. ex Benth, Cajanus cajan (L.) Millsp, and Sorghum bicolor (L.) Moench. After corn harvesting, the soil was sampled at depths of 0.00-0.10 and 0.10-0.20 m. The cover crops showed different effects at different soil depths. The soil cultivated with U. ruziziensis showed higher contents of total-N and particulate-N than the soil cultivated with C. cajan. Particulate-N was the most sensitive to changes in the soil management among the fractions of N assessed. The soil under N topdressing showed a lower content of available-N in the 0.10-0.20 m layer, which may be caused by the season in which the sampling was conducted or the greater uptake of the available-N by corn.
Unidade Acadêmica:	Faculdade de Agronomia e Medicina Veterinária (FAV)
Licença:	Revista Brasileira de Ciência do Solo - This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0). Fonte: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100508&lng=en&nrm=iso. Acesso em: 13 mar. 2018.
DOI:	http://dx.doi.org/10.1590/18069657rbcs20150092
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