Effect of Nitrogen Form on Trifoliate Orange (Poncirus trifoliata) and Sour Orange (Citrus aurantium) Plants Grown Under Saline Conditions

Louloudia Koulımboudı; Anna Papafılıppou; Maria Tzanoudakı; Christos Chatzıssavvıdıs

Effect of Nitrogen Form on Trifoliate Orange (Poncirus trifoliata) and Sour Orange (Citrus aurantium) Plants Grown Under Saline Conditions

Year 2014, Volume: 1 Issue: Özel Sayı-2, 1596 - 1605, 01.03.2014

Louloudia Koulımboudı Anna Papafılıppou Maria Tzanoudakı Christos Chatzıssavvıdıs

Abstract

The effect of the form of nitrogen (N) on the vegetative growth and the chemical composition of trifoliate orange plants (Poncirus trifoliata) and sour orange plants (Citrus aurantium) irrigated with Hoagland nutrient solution with or without NaCl combined with three forms of N (nitrate, ammonium and their combination) was studied. At the end of the experiment, it was found that the trifoliate orange plants were more sensitive to salinity, since the weight of the fresh matter and the concentration of chlorophyll in the leaves were negatively affected. The highest values in the weight of the leaves and roots of the trifoliate orange plants were observed in the treatments with ammonium N, while the highest concentration of chlorophyll was observed in the treatments with a combination of nitrate and ammonium N under normal conditions. Furthermore, the highest values in the FW of the roots and shoots as well as in the chlorophyll units in the basal and top leaves were found in the sour orange plants which received a combination of nitrate and ammonium N under salinity conditions. Generally, N forms had different effects on the two genotypes in many cases. Finally, the inclusion of NaCl in the nutrient solution increased Na concentration in the leaves, the shoots and the roots of the two genotypes, whereas K concentration was reduced

Keywords

nitrogen forms, salinity, sour orange, trifoliate orange, citrus

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