Cover Crops and Nitrogen Fertilization Effects on Nitrogen Soil Fractions under Corn Cultivation in a No-Tillage System
作者： Márcia de Sousa Veras , Maria Lucrécia Gerosa Ramos , Daiana Nara Santos Oliveira , Cícero Célio de Figueiredo , Arminda Moreira de Carvalho
DOI: 10.1590/18069657RBCS20150092
关键词:
摘要: The use of cover crops has recently increased and represents an essential practice for the sustainability no-tillage systems in Cerrado region. However, there is little information on effects nitrogen fertilization crop soil fractions. This study assessed changes N forms cropped to prior corn growing. experiment consisted a randomized complete block design arranged split-plots with three replications. Cover were tested plots, topdressing was subplots. following species planted succession eight years: Urochloa ruziziensis, Canavalia brasiliensis M. ex Benth, Cajanus cajan (L.) Millsp, Sorghum bicolor Moench. After harvesting, sampled at depths 0.00-0.10 0.10-0.20 m. showed different depths. cultivated U. ruziziensis higher contents total-N particulate-N than C. cajan. Particulate-N most sensitive management among fractions assessed. under lower content available-N m layer, which may be caused by season sampling conducted or greater uptake corn.
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