Determination of 15N stable isotope natural abundances for assessing the use of saline reclaimed water in grapefruit
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Romero Trigueros, Cristina; Nortes Tortosa, Pedro Antonio; Alarcón Cabañero, Juan José; Nicolás Nicolás, EmilioFecha de publicación
2014-10Editorial
Technical University "Gh. Asachi" IasiCita bibliográfica
ROMERO TRIGUEROS, Cristina et al. Determination of 15N stable isotope natural abundances for assessing the use of saline reclaimed water in grapefruit. Environmental Engineering and Management Journal, 2014, 13(10), pp. 2525-2530Revisión por pares
SIPalabras clave
Enrichment of δ 15NGas exchange parameters
Isotopic measurement
Nitrogen use efficiency
Saline reclaimed water
Resumen
We reported the results of an isotopic study aimed at evaluating the medium to long-term effects of different water qualities and deficit irrigation strategies on the ecophysiology of grapefruit in a 7-year-old plantation in SE Spain. For a better understanding of the interaction between nitrogen and salts from reclaimed water, RW, an experiment using natural abundance (δ) of 15N was conducted. This study showed that in grapefruit crop irrigated with RW leaf δ15N value increased. We concluded that: (i) causal links exist between leaf δ15N isotope and salt stress: positive correlation between values of this isotope and leaf salt content was showed; (ii) excess of nitrates provided by the reclaimed irrigation water were lost in the ecosystem through leaching, denitrification, etc., enriching the medium with δ15N and increasing δ15N values in plants. Therefore, the results of this study highlight the key role that salt content from RW can play in N uptake by plants and, hence, isotopic ...
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