Autoria: PEREIRA, R. G.; HEINEMANN, A. B.; MADARI, B. E.; CARVALHO, M. T. de M.; KLIEMANN, H. J.; SANTOS, A. P. dos

Resumo: The objective of this work was to evaluate the effect of eucalyptus biochar on the transpiration rate of upland rice 'BRSMG Curinga' as an alternative means to decrease the effect of water stress on plant growth and development. Two?pot experiments were carried out using a completely randomized block design, in a split-plot arrangement, with six replicates. Main plots were water stress (WS) and no?water stress (NWS), and the subplots were biochar doses at 0, 6, 12 and 24% in growing medium (sand). Total transpirable soil water (TTSW), the p factor ? defined as the average fraction of TTSW which can be depleted from the root zone before water stress limits growth ?, and the normalized transpiration rate (NTR) were determined. Biochar addition increased TTSW and the p factor, and reduced NTR. Consequently, biochar addition was able to change the moisture threshold (p factor) of the growing medium, up to 12% maximum concentration, delaying the point where transpiration declines and affects yield.

Ano de publicação: 2012

Tipo de publicação: Artigo de periódico

Unidade: Embrapa Arroz e Feijão

Palavras-chave: Arroz, Deficiência hídrica, Estresse abiótico, Eucalipto, Oryza sativa