Title:	Cover crops and Nitrogen fertilization effects on Nitrogen soil fractions under corn cultivation in a no-tillage system.
Authors:	VERAS, M. de S. RAMOS, M. L. G. OLIVEIRA, D. N. S. FIGUEIREDO, C. C. de CARVALHO, A. M. de PULROLNIK, K. SOUZA, K. W. de
Affiliation:	MÁRCIA DE SOUSA VERAS, UNIVERSIDADE DE BRASÍLIA MARIA LUCRÉCIA GEROSA RAMOS, UNIVERSIDADE DE BRASÍLIA DAIANA NARA SANTOS OLIVEIRA, UNIVERSIDADE DE BRASÍLIA CÍCERO CÉLIO DE FIGUEIREDO, UNIVERSIDADE DE BRASÍLIA ARMINDA MOREIRA DE CARVALHO, CPAC KARINA PULROLNIK, CPAC KLEBERSON WORSLLEY DE SOUZA, CPAC.
Date Issued:	2016
Citation:	Revista Brasileira de Ciência do Solo, Viçosa, v. 40, Apr. 2016.
Description:	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.
NAL Thesaurus:	Plant nutrition Soil management Fertilizers Crops
DOI:	https://doi.org/10.1590/18069657rbcs20150092
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPAC)