Título:	Polymer-coated urea in broadcast or furrow application in the corn-palisadegrass intercropping system.
Autoria:	ALMEIDA, R. E. M. de FAVARIN, J. L. OLIVEIRA, F. B. PIEROZAN JUNIOR, C. OLIVEIRA, S. M. de LAGO, B. C. TEZOTTO, T. OTTO, R. TRIVELIN, P. C. O.
Afiliação:	RODRIGO ESTEVAM MUNHOZ DE ALMEIDA, CNPASA; JOSE LAERCIO FAVARIN, ESALQ; FELIPE BRENDLER OLIVEIRA, ESALQ; CLOVIS PIEROZAN JUNIOR, INSTITUTO FEDERAL DE EDUCAÇÃO, Palmas-TO; SILAS MACIEL DE OLIVEIRA, ESALQ; BRUNO COCCO LAGO, ESALQ; TIAGO TEZOTTO, ESALQ; RAFAEL OTTO, ESALQ; PAULO CESAR OCHEUZE TRIVELIN, CENA.
Ano de publicação:	2019
Referência:	Journal of Agricultural Science, v. 11, n. 3, p. 226-241, 2019.
Conteúdo:	Polymer coated urea (PCU) have the potential to increase nitrogen (N) use efficiency (NUE) by the release of N following crop demand while reducing losses by volatilization, leaching and denitrification. However, the NUE of PCU is still unclear especially in systems of corn-palisadegrass intercropping. Broadcast application of urea result in ammonia volatilization losses, new technologies must be adopted in order to allow broadcast application of urea. The aim of this research was to evaluate NUE from PCU in the corn-palisadegrass intercropping system and the viability of the broadcast application using PCU. Two field trials were carried out in a 4 × 2 factorial design including fertilization treatments and application forms. Fertilization treatments were: Conventional Urea topdressing (CUT); Conventional Urea at corn planting (CUP); PCU applied at planting to release in 30 days (PCU30); PCU mixture applied at planting to release in 30 and 60 days (PCU30+60); and application forms: broadcast placement and in furrow. 15N-urea was used for the determination of NUE. The corn yield and palisadegrass above-ground biomass were not affected by the fertilization treatments or application forms. PCU did not increase N uptake and the NUE by corn or palisadegrass in relation to urea. The N uptake from fertilizer by palisadegrass intercropped with corn is less than 1% of all N uptake on the intercropping system and at most 2% of the N fertilizer applied. The slow release urea does not enable the broadcast application and its efficiency depended upon the same climatic conditions as those of the conventional urea.
Thesagro:	Brachiaria Capim Urochloa Nitrogênio
NAL Thesaurus:	Sustainable agriculture Intercropping Urea Polymer-coated urea
ISSN:	1916-9760
Digital Object Identifier:	10.5539/jas.v11n3p226
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPASA)