Data/hora: 03/06/2024 15:10:01

Provedor de dados: 	Bragantia	
País: 	Brazil	
Título: 	Fate of 15N-urea applied to wheat-soybean succession crop	
Autores: 	Boaretto,Antonio Enedi; Spolidorio,Eduardo Scarpari; Freitas,José Guilherme de; Trivelin,Paulo Cesar Ocheuze; Muraoka,Takashi; Cantarella,Heitor.	
Data: 	2004-01-01	
Ano: 	2004	
Palavras-chave: 	Nitrogen fertilization; Efficiency; Ammonia; Volatilization.	
Resumo: 	The wheat crop in São Paulo State, Brazil, is fertilized with N, P and K. The rate of applied N (0 to 120 kg.ha-1) depends on the previous grown crop and the irrigation possibility. The response of wheat to rates and time of N application and the fate of N applied to irrigated wheat were studied during two years. Residual N recovery by soybean grown after the wheat was also studied. The maximum grain productivity was obtained with 92 kg.ha-1 of N. The efficiency of 15N-urea utilization ranged from 52% to 85%. The main loss of applied 15N, 5% to 12% occurred as ammonia volatilized from urea applied on soil surface. The N loss by leaching even at the N rate of 135 kg.ha-1, was less than 1% of applied 15N, due to the low amount of rainfall during the wheat grown season and a controlled amount of irrigated water, that were sufficient to moisten only the wheat root zone. The residual 15N after wheat harvest represents around 40% of N applied as urea: 20% in soil, 3% in wheat root system and 16% in the wheat straw. Soybean recovered less than 2% of the 15N applied to wheat at sowing or at tillering stage.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052004000200011	
Editor: 	Instituto Agronômico de Campinas	
Relação: 	10.1590/S0006-87052004000200011	
Formato: 	text/html	
Fonte: 	Bragantia  v.63 n.2 2004	
Fonte: 	info:eu-repo/semantics/openAccess