Cover Crops and Nitrogen Fertilization Effects on Nitrogen Soil Fractions under Corn Cultivation in a No-Tillage System
| Autor: | K. Pulrolnik, Daiana Nara Santos Oliveira, Cícero Célio de Figueiredo, Arminda Moreira de Carvalho, Márcia de Sousa Veras, Maria Lucrécia Gerosa Ramos, Kleberson Worslley Souza |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
0106 biological sciences
Plantas - nutrição Randomized block design Soil Science plant nutrition Biology 01 natural sciences Soil management Cajanus Human fertilization fertilization and nutrition of annual crops Urochloa lcsh:Agriculture (General) Cover crop Solos - manejo food and beverages 04 agricultural and veterinary sciences biology.organism_classification lcsh:S1-972 Tillage Agronomy 040103 agronomy & agriculture 0401 agriculture forestry and fisheries soil management Agronomy and Crop Science Plant nutrition 010606 plant biology & botany |
| Zdroj: | Revista Brasileira de Ciência do Solo v.40 2016 Revista Brasileira de Ciência do Solo Sociedade Brasileira de Ciência do Solo (SBCS) instacron:SBCS Revista Brasileira de Ciência do Solo, Volume: 40, Article number: e0150092, Published: 29 APR 2016 Revista Brasileira de Ciência do Solo, Vol 40, Iss 0 (2016) Repositório Institucional da UnB Universidade de Brasília (UnB) instacron:UNB |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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