Sweet pepper grown under salinity stress as affected by CO2 enrichment and nitrogen source
2017
Porras, M. E. | Lorenzo, P. | Medrano, E. | Sanchez-Gonzalez, M. J. | Baeza, E. J. | Pinero, M. C. | Sanchez-Guerrero, M. C.
Water salinity is one of the most important factors limiting production, especially in most sensitive species such as pepper. It is important to find strategies to allow the plants to overcome that stress. The present study examines the effect of the air CO2 enrichment and the variation of nitrogen source in the nutrient solution on growth and yield of sweet pepper (Capsicum annuum L.) under saline conditions. Two greenhouses were used for the experiment, with and without CO2 supply respectively. In each one, two treatments of nitrogen source (NO3- and NO3-+NH4+) were combined with two salinity levels (8 and 25 mM of NaCl) in the nutrient solution. CO2 enrichment affected biomass production principally in the fruit fraction, increasing the marketable yield (8 and 22% with and without salinity stress respectively). Under all studied conditions, the ammonium supply initially showed a positive effect on vegetative growth and leaf expansion. However, its effect on yield was dependent on salinity conditions. A deleterious effect was found on marketable yield when the ammonium supply was combined with high salinity conditions.
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