Data/hora: 03/06/2024 07:20:48

Biblioteca(s): 	Embrapa Meio Norte / UEP-Parnaíba.	
Data corrente: 	14/05/1998	
Data da última atualização: 	19/12/2011	
Autoria: 	McCONNELL, J. S.; BAKER, W. H.; FRIZZELL, B. N.	
Título: 	Plant and environment interactions.	
Ano de publicação: 	0	
Fonte/Imprenta: 	Journal of Environmental Quality.	
Idioma: 	Inglês	
Conteúdo: 	Nitrogen fertilizer usein cotton(Gossypium hirsutum L.) production has recently come under secrutiny as a potential source of N03- contamination of streams and groundwater. This study was conducted to evaulate the distribution of N03-N in soil cropped to continous cotton and determine the fertilization and irrigation conditions that might exacerbate the accumulation of NO3-N. Long-term N fertilization studies were conducted in five side by side irrigation blocks at the Southeast Branch Experiment Station at Rohwer, AR, on an Herbet silt loam (fine-silty, mixed, thermic Aeric Ochraqualf) soil. Soil samples were taken in the early spring (1994) to a depth of 1.5 m in l5 cm increments from three replicates  of each N-treatment from four irrigated and one dryland block and analyzed for NO3 -N. Soil cropped to dryland cotton showed execessive accumulation (up to 101.2 mg N03 -N kg-1) of NO3 -N when treated with N rates of 67 kg N ha-1 and greater. Soils cropped to irrigated cotton did not accumulate  as much NO3 _N as dryland cotton. Soil N03 -N was unaffected by N treatments at any depht in two of three center pivot irrigated blocks. Slight increases in soil No3 -N were observed under furrow irrigated conditions with the greatest N treatments (134 and 168 kg N ha-1). Dryland cotton was more likely to have accumulations of N03 -N in the soil profile than irrigated cotton. This was probably due to reduced plant uptake of fertilizer N under nonirrigated production conditions.	
Palavras-Chave: 	Nitrate.	
Thesagro: 	Algodão; Gossypium Hirsutum; Lençol Freático; Lixiviação; Nitrato; Nitrogênio.	
Thesaurus Nal: 	cotton; groundwater; leaching; nitrogen.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)	
Exemplares: 	CPAMN-UEPP - (8183-1) - ADD - SP - -- - 98.00061 -  - 1998.00061 - DIS