01913naa a2200301 a 450000100080000000500110000800800410001902400570006010000190011724501100013626000090024652010120025565000190126765000120128665000150129865000260131365000100133965000260134965000140137565000170138965300230140670000210142970000180145070000260146870000200149470000220151477300750153619273782022-09-16       2012    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1590/S0100-204X20120005000122DOI1 aPEREIRA, R. G.  aTranspiration response of upland rice to water deficit changed by different levels of eucalyptus biochar.  c2012  aThe 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.  aAbiotic stress  abiochar  aEucalyptus  aPlant-water relations  aArroz  aDeficiência hídrica  aEucalipto  aOryza sativa  aEstresse abiótico1 aHEINEMANN, A. B.1 aMADARI, B. E.1 aCARVALHO, M. T. de M.1 aKLIEMANN, H. J.1 aSANTOS, A. P. dos  tPesquisa Agropecuária Brasileiragv. 47, n. 5, p. 716-721, maio 2012.