Resumo

CABRERA, J. A  e  ZUAZNABAR, R. Sugarcane response to nitrogen fertilization in a long-term trial with 24 accmulated harvests. cultrop [online]. 2010, vol.31, n.1, pp. 00-00. ISSN 0258-5936.

Nitrogen is a vital nutrient for sugarcane growth and development, which increases cane and sugar yields when it is rationally used. In this regard, an investigation was carried out for 27 years, with the objective of defining yield behavior with different doses of N applied to a sugarcane agro-ecosystem where burning is used to harvest. A long-term N level trial was conducted under drought conditions, with four planting cycles and 24 harvests. An eútric typical Red Ferralitic soil was employed. Plant cane did not respond to N fertilization; the response was not systematic in the first ratoon, but it became more stable in the second one and there was always a response from the third ratoon on, whereas the required N doses were different per each cycle, it decreasing from the fourth ratoon on with regard to the previous cycles. In general, N needs diminished with rainfall increment.

Palavras-chave : sugarcane; nitrogen fertilizers; plant response; nutritional requirements; rainfall.

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