| Registro completo |
| Provedor de dados: |
Bragantia
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| País: |
Brazil
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| Título: |
Fate of 15N-urea applied to wheat-soybean succession crop
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| Autores: |
Boaretto,Antonio Enedi
Spolidorio,Eduardo Scarpari
Freitas,José Guilherme de
Trivelin,Paulo Cesar Ocheuze
Muraoka,Takashi
Cantarella,Heitor
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| Data: |
2004-01-01
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| Ano: |
2004
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| Palavras-chave: |
Nitrogen fertilization
Efficiency
Ammonia
Volatilization
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| 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.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052004000200011
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| Editor: |
Instituto Agronômico de Campinas
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| Relação: |
10.1590/S0006-87052004000200011
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| Formato: |
text/html
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| Fonte: |
Bragantia v.63 n.2 2004
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| Direitos: |
info:eu-repo/semantics/openAccess
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