Data/hora: 23/06/2024 17:48:28

Biblioteca(s): | Embrapa Agrobiologia.
Data corrente: | 24/01/2006
Data da última atualização: | 24/01/2006
Autoria: | SCHOMBERG, H. H.; ENDALE, D. M.; CALEGARI, A.; PEIXOTO, R. dos G. T.; MIYAZAWA, M.; CABRERA, M. L.
Título: | Influence of cover crops on potential nitrogen availability to succeeding crops in a Southern Piedmont soil.
Ano de publicação: | 2005
Fonte/Imprenta: | Biology and Fertility of Soils, Berlin, v. 42, n. 4, p. 299-307, mar. 2006.
Idioma: | Inglês
Conteúdo: | Winter cover crops are essential in conservation tillage systems to protect soils from erosion and for improving soil productivity. Black oat (Avena strigosa Schereb) and oliseed radish ( Raphanus sativus L.) could be useful cover crops in the southeastern USA, but successful adoption requires understanding their unfluence on N availability in conservation tillage systems. Black oat  and oilseed radish were compared to crimson clover (trifolium incarnatum L.) and rye ( Secale cereale L.) for biomass production and effects on N mineralization during the summer crop growing season from fall 1998 through summer 2002 near Watkinville, GA. Rye produced 40 to 60% more biomass, although  N contents were less than the other cover crops. Oilseed radish and black oat N contents were similar to crimson clover. Black oat, oilseed radish, and crimson clover C/N ratios were less than 30. Whereas rye averaged 39. Amount of N mineralized in 90 days (Nmin90) measured with in situ soil cores was 1.3 to 2.2 times greater following black oat , crimson clover, and oilseed radish than following rye. No differences in N min 90 were found between black oats, crimson clover, and oilseed radish in 1999 and 2000. The amount of potentially mineralizable N (N0) was not different due to cover crop, but was 1.5 time greater in 2000 and 2002 than in 1999. The rate of N mineralization (k) was 20 to 50% slower following rye than the other three cover crops. Black oat and oilseed radish biomass production and soil N mineralization dynamics were more similar to crimson clover than to rye, which indicates than they could be used as cover crops in the southeast without significant changes in N recommendations for most crops.
Palavras-Chave: | N.
Thesagro: | Nitrogênio; Solo.
Thesaurus Nal: | nitrogen; soil.
Categoria do assunto: | --
Registro original: | Embrapa Agrobiologia (CNPAB)
Exemplares: | CNPAB - (33051-1) - UPC - SP - -- -  -  - 0023072 - DIS