Data/hora: 24/06/2024 05:57:11

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