Abstract

HERNANDEZ, Reinier et al. Anti-stress effects of humic acids of vermicompost in two rice (Oryza sativa. L) cultivars. cultrop [online]. 2018, vol.39, n.2, pp.65-74. ISSN 0258-5936.

Humic acids (AH) were extracted and isolated from bovine manure vermicompost, and they were partially characterized using UV-vis and / FT-IR. They were sprinkled foliarly at 32 days after germination coinciding with the start-up phase tillage in rice cultivation (Oryza sativa L.) under conditions of irrigation and water deficit. Three concentrations of AH (30, 34 and 38 mg L^-1) were used, in addition to a control treatment without application. Specifically in the active tillering stage, the effect of foliar application of AH under irrigation conditions and water deficit was evaluated in indicators such as: plant height, dry mass in the root section, peroxidase enzyme activity (POX) and content of soluble proteins. The results indicated positive effects of the AH on the biochemical - physiological indicators evaluated in the vegetative phase, with effects on the dry mass in the radical part up to 40 % higher than the control, observing evidence of a possible protective effect against the water deficit by the AH. It was concluded that a possible response could be the mimetic action of AH with the abscisic acid hormone (ABA), producing equivalent effects to this

Keywords : hydric stress; peroxidase; total proteins; humic substances.

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