Cover crops and nitrogen fertilization effects on nitrogen soil fractions under corn cultivation in a no-tillage system
Uloženo v:
| Hlavní autor: | |
|---|---|
| Datum vydání: | 2016 |
| Další autoři: | , , , , , |
| Médium: | Article |
| Jazyk: | eng |
| Zdroj: | Repositório Institucional da UnB |
| Download full: | http://repositorio.unb.br/handle/10482/30046 http://dx.doi.org/10.1590/18069657rbcs20150092 |
Shrnutí: | 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. |
Podobné jednotky: Cover crops and nitrogen fertilization effects on nitrogen soil fractions under corn cultivation in a no-tillage system
- Soil fertility status, carbon and nitrogen stocks under cover crops and tillage regimes
- Characterization of cover crops by NMR spectroscopy : impacts on soil carbon, nitrogen and phosphorus under tillage regimes
- Nitrogen oxides and CO2 from an Oxisol cultivated with corn in succession to cover crops
- Cover plants and mineral nitrogen : effects on organic matter fractions in an oxisol under no-tillage in the cerrado
- Soil organic matter as affected by management systems, phosphate fertilization, and cover crops
- Soil microbiological properties and available nitrogen for corn in monoculture and intercropped with forage
