Data/hora: 14/06/2024 06:18:52

Biblioteca(s): 	Embrapa Trigo.	
Data corrente: 	10/01/2010	
Data da última atualização: 	11/12/2012	
Autoria: 	MYERS, R. J. K.	
Título: 	A simple model for estimating the nitrogen fertilizer requirement of a cereal crop.	
Ano de publicação: 	1984	
Fonte/Imprenta: 	Fertilizer Research, v. 5, n. 1, p. 95-108, 1984.	
Idioma: 	Inglês	
Conteúdo: 	A static model that predicts the nitrogen (N) fertilizer requirement of grain sorghum or wheat crops is described. Inputs required by the model are soil nitrate-N (kg ha–1) in the profile at sowing, total N (%) in the plough layer, available water in the profile at sowing (mm) plus rainfall during the growing season (mm). Output includes fertilizer N required for both maximum yield and optimum economic yield. The model was tested by using published field data from Nebraska and Kansas (U.S.A.), South Australia and Northern Territory (Australia), and Saskatchewan (Canada). The model was accurate when no fertilizer N was required, and when large amounts were required, but quantitative prediction of moderate requirements was only fair. Predictions for grain sorghum were better than for winter wheat, probably because total water use was a better predictor of yield potential for grain sorghum than for winter wheat. Further refinement for specific environments should make the model practical for dryland cereal crops.	
Palavras-Chave: 	Modelo para estimar o N a ser aplicado em sorgo e trigo.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Trigo (CNPT)	
Exemplares: 	CNPT - (28481-1) - ADD - SP - -- - 14562 -  - 14562 - DIS