Data/hora: 01/06/2024 08:23:18

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