Resumo

VEGA PONCE, Cristhian  e  MEJIA MARCACUZCO, Jesús Abel. ELASTICITY MODULUS AS A HYDRIC REGULATION CRITERION OF COMMON BEAN (PHASEOLUS VULGARIS L.) UNDER CONTROLLED IRRIGATION REDUCTIONS. Inv. y Des. [online]. 2017, vol.1, n.17, pp.15-25. ISSN 1814-6333.

The purpose of this research was to study the effect of controlled irrigation reductions on the elasticity modulus (ε_v) in common bean plants (Phaseolus vulgaris L.) cultivated in hydrogravitropic response pots. The plants were submitted to complete root irrigation (RCR) and partial root zone-drying irrigation (RPR), where the water assigned according to the water-soil retention curve allowed to control and configure four treatments (RPR300, RPR500, RCR300 and RCR500 or control). The xylem water potential (Ψx) of the leaves was monitored, and then the pressure-volume curve (P-V) was constructed to determine ε_v. The results showed that the different volumes of water applied generated significant variations in the levels of ε_v; however, in the treatments configured to bring the soil to field capacity (RPR500 and RCR500) it was where the best performance of ε_vwas obtained, effect expected mainly before applying the irrigation to the plants (15,63 and 15,34 MPa, respectively). Finally, although both treatments obtained the same level of significance of ε_v, RPR500 stood out about the control treatment, because the reduced water volumes, combined with the maintenance of different moisture values in the soil explored by the roots, could be a key in favor of an elastic fit.

Palavras-chave : Water Stress; Elasticity Modulus; Partial Rootzone-Drying Irrigation.

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