Abstract

MORALES-GUEVARA, Donaldo et al. A QuitoMax^® effect in plants of (Phaseolus vulgaris L.) under two irrigation regimes. II. physiological variables. cultrop [online]. 2017, vol.38, n.4, pp.92-101. ISSN 0258-5936.

This work was carried out with the objective to evaluate the effect of QuitoMax^® on different physiological variables in bean plants (Phaseolus vulgaris L) conducted under two irrigation regimes. The black bean, variety ̏  Tomeguín ̋  was planted in concrete gutters of 2,60 m long by 0,60 m wide, in which two separate rows were placed at 0,40 m and a plant spacing of 0,11 cm for a total of 44 plants per channel, each treatment counted on three replicates. The treatments were: 100 (T100) percent of the ETc. (Standard crop evapotranspiration) and 50 (T50) percent of ETc, counting in each irrigation treatment with a variant in which 200 mg ha^-1 of QuitoMax^® were applied at 20-25 days after sowing and a dose similar to the beginning of flowering and another dose in which the biostimulant was not applied. The evaluations were leaf water potential, current osmotic and saturated osmotic potentials, relative water content, stomatal conductance, total chlorophylls a and b and in SPAD units, the stomata were observed, and also turgor potential is estimated from the leaf water and osmotic potentials. The results indicated first, that bean plants (Phaseolus vulgaris L.) are affected when subjected to a regime of insufficient irrigation and secondly, that the two applications of QuitoMax^® were able to attenuate the effects of water deficiency

Keywords : chlorophyll; stomatal conductance; water potential; osmotic potential; chitosan.

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