Abstract

DE LA CASA, A; OVANDO, G; BRESSANINI, L  and  MARTINEZ, J. Estimación del rendimiento potencial de papa en Córdoba, Argentina, a partir de la eficiencia en el uso de la radiación y de la productividad del agua. Agriscientia [online]. 2014, vol.31, n.2, pp.75-91. ISSN 1668-298X.

Knowing the potential yield (RP) of potato crop (Solanum tuberosum L.) is needed to establish the productivity gap compared to yields obtained by producers. This article uses different models to estimate the RP for late potato growing season in Córdoba, Argentina, comparing two methods based on: a) radiation use efficiency (RPe) and b) efficiency or productivity of water (w), which was normalized according to vapor pressure deficit (RPw^D) and the reference crop evapotranspiration (RPw^ETo). The RPe for four planting dates from 2007 to 2012 was highly variable (CV = 17.7%), with a mean value of 9.7 Mg ha^-1 of dry weight (PS), showing a gradual trend to decrease with the delay of planting, with a rate between 1 and 1.4% of RP per day of delay. The average RPw^D was significantly (P < 0.001) lower (8.4 Mg PS ha^-1), with similar variability between years and planting dates (CV = 17.3%), and the same trend to decrease was observed as planting was delayed. The RPw^ETo tended to be only slightly lower (9.3 Mg PS ha^-1) than those obtained with Rpe. This difference was not significant (P > 0.05), and its estimates were less variable (CV = 9.7%).

Keywords : Potato; Potential yield; Radiation use efficiency; Water productivity.