Data/hora: 07/06/2024 17:08:46

Biblioteca(s): 	Embrapa Meio Norte / UEP-Parnaíba.	
Data corrente: 	20/12/1995	
Data da última atualização: 	20/12/1995	
Autoria: 	WEBSTER, C. P.; BELFORD, R. K.; CANNELL, R. Q.	
Afiliação: 	Agricultural and Food Research Council Letcombe Laboratory.	
Título: 	Crop uptake and leaching losses of 15N labelled fertilizer nitrogen in relation to waterlogging of clay and sandy loam soils.	
Ano de publicação: 	1986	
Fonte/Imprenta: 	Plant and Soil, v.92, p.89-101, 1986.	
Idioma: 	Inglês	
Conteúdo: 	Ammonium nitrate fertilizer, labelled with 15N, was applied in spring to winter wheat growing in undisturbed monoliths of clay and sandy loam soil in lysimeters; the rates of application were respectively 95 and 102 kg N ha-1 in the spring of 1976 and 1975. Crops of winter wheat, oilseed rape, peas and barley grown in the following 5 or 6 years were treated with unlabelled nitrogen fertilizer at rates recommended for maximum yields. During each year of the experiments the lysimeters were divided into treatments which were either freelydrained or subjected to periods of waterlogging. Another labelled nitrogen application was made in 1980 to a separate group of lysimeters with a clay soil and a winter wheat crop to study further the uptake of nitrogen fertilizer in relation to waterlogging. In the first growing season, shoots of the winter wheater at harvest contained 46 and 58% of the fertilizer nitrogen applied to the clay and sandy loam soils respectively. In the following year the crops contained a further 1-2% of the labelled fertilizer, and after 5 and 6 years the total recoveries of labelled fertilizer in the crops were 49 and 62% on the clay and sandy loam soils respectively. In the first winter after the labelled fertilizer was applied, less than 1% of the fertilizer was lost in the drainage water, and only about 2% of the total nitrogen (mainly nitrate) in the drainage water from both soils was derived from the fertilizer. Maximum annual loss occurred the following year but the proportion of...	
Palavras-Chave: 	15N nitrogen; Arable crops; Culturas araveis; Denitrificacao; Lysimeter; Sandy loam; Terra arenosa; Terra argilosa; Waterlogging.	
Thesagro: 	Drenagem; Lisímetro; Lixiviação; Nitrogênio.	
Thesaurus Nal: 	clay; denitrification; drainage; leaching.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Meio Norte / UEP-Parnaíba (CPAMN-UEPP)	
Exemplares: 	CPAMN-UEPP - (4548-1) - ADP - SP - -- -  -  - 1992.04776 - DIS