
TY  - JOUR
A1  - Papadakis, I. E. 
A1  - Dimassi, K. N. 
A1  - Therios, I. N. 
T1  - Response of two citrus genotypes to six boron concentrations: concentration and distribution of nutrients, total absorption, and nutrient use efficiency
JF  - Australian Journal of Agricultural Research
JO  - Aust. J.  Agric. Res.
Y1  - 2003
VL  - 54
IS  - 6
SP  - 571
EP  - 580
KW  - boron toxicity, transpiration rate, stomatal conductance.
UR  - https://doi.org/10.1071/AR02163 
N2  - A greenhouse experiment was performed to study the effects of boron (B) on growth, nutrient concentration and distribution, nutrient use efficiency, and total nutrient absorption of 2 citrus genotypes. The experimental layout was a 6 &#215; 2 factorial, with 6 B concentrations (0.05, 0.25, 0.50, 1.00, 2.00, and 5.00 mg/L) on 2 genotypes: the sour orange (Citrus aurantium L.) and the Swingle citrumelo (C. paradisi Macf. &#215; Poncirus trifoliata L.). The plants were grown for 3 months in a B-free sand : perlite (1 : 1) medium that was irrigated with 6 half-strength Hoagland&#39;s nutrient solutions. Increasing B supply in the nutrient solution increased the B concentration linearly in all parts of the plant in the following order: basal leaves &#62; top leaves &#62; bark &#62; root &#62; stems &#62; wood. There was no consistent effect of B supply on the concentration of other fundamental elements (P, K, Ca, Mg, Mn, Zn, Fe). Furthermore, none of the tested B concentrations significantly affected the total plant content and consequently the absorption of any other element. A concentration of 1.00 mg B/L or higher resulted in less B absorption by the Swingle citrumelo than by the sour orange. Furthermore, the Swingle citrumelo has the ability to retain more B in its stems and roots than the sour orange, thus preventing B transport to leaves. Finally, B and Mn use efficiency in both genotypes correlated significantly and negatively with the B supply. 
ER  -

