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Revista Brasileira de Ciência do Solo

versão On-line ISSN 1806-9657

Resumo

SILVA, Simone Aparecida da; ARF, Orivaldo; BUZETTI, Salatiér  e  SILVA, Matheus Gustavo da. Nitrogen sources and application times in no-till wheat on cerrado soil. Rev. Bras. Ciênc. Solo [online]. 2008, vol.32, n.spe, pp.2717-2722. ISSN 1806-9657.  http://dx.doi.org/10.1590/S0100-06832008000700015.

Nitrogen is an important nutrient, due to its soil dynamics and crop demand. The amount of N supplied by the soil is however frequently insufficient, and N fertilization is required to obtain maximum yields. This study was conducted with the objective of evaluating different sources and periods of N application in no till wheat. A randomized block design was used in a factorial scheme 2x6 with four replications. The treatments consisteded of the combination of two N sources: Urea and Entec and six application times: control (without N); N at sowing (S); N 15 days after emergence (DAE); N 30 DAE; 1/3 of N at S + 2/3 15 DAE; and 1/3 of N at S + 2/3 30 DAE. The experiment was carried out at an experimental station of the UNESP in the county of Selvíria - Mato Grosso do Sul State, on a soil previously occupied by cerrado vegetation. The N applied 30 days after plant emergence induced highest grain yields, although statistically there was no difference to the application of 1/3 of N at sowing + 2/3 of N 30 days after plant emergence.

Palavras-chave : Triticum aestivum L; urea; entec.

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