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Eduardo Spolidorio ; José de Freitas ; Paulo Cesar Trivelin ; Takashi Muraoka ; Heitor Cantarella ;Bragantia 2004, 63 2

Autor: Antonio Boaretto

Fuente: http://www.redalyc.org/


Bragantia ISSN: 0006-8705 editor@iac.sp.gov.br Instituto Agronômico de Campinas Brasil Boaretto, Antonio; Spolidorio, Eduardo; de Freitas, José; Trivelin, Paulo Cesar; Muraoka, Takashi; Cantarella, Heitor Fate of 15n-urea applied to wheat-soybean succession crop Bragantia, vol.
63, núm.
2, 2004, pp.
265-274 Instituto Agronômico de Campinas Campinas, Brasil Available in: http:--www.redalyc.org-articulo.oa?id=90863211 How to cite Complete issue More information about this article Journals homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative Fate of N-urea applied to wheat-soybean sucession FATE OF 15 265 N-UREA APPLIED TO WHEAT-SOYBEAN SUCCESSION CROP (1) ANTONIO ENEDI BOARETTO(2 ,5); EDUARDO SCARPARI SPOLIDORIO(3 ,5) ; JOSÉ GUILHERME DE FREITAS(4 ,5) PAULO CESAR OCHEUZE TRIVELIN(2,5) TAKASHI MURAOKA(2,5), HEITOR CANTARELLA(4,5) ABSTRACT 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 15 N, 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...

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