Abstract
The use of reflective materials has become commonplace in agriculture as the negative effects of drought, high temperature limitation, and solar radiation on plant physiology have been better understood. This study was conducted to compare the effects of different reflective materials on some physiological characteristics of almond trees. For this purpose, a method was developed in which two solid and two transparent reflective materials were foliar sprayed at two different doses in two different deficit irrigated almond orchards (cv. ‘Ferragnes’) in 2021. Net photosynthesis rate, stomatal conductance (gS), leaf temperature (Tleaf), relative water content (RWC), SPAD chlorophyll index, proline (P), malondialdehyde (MDA), as well as some macro- and micro-nutrient contents of leaf samples taken from the treated trees were examined. The applications reduced Tleaf from 2.7 to 7.9 °C. Generally, titanium dioxide (TiO2) 0.50% and 0.25% doses consistently reduced Tleaf. The effect of reflective materials on photosynthesis was not clear. TiO2 0.25% consistently increased gS irrigated with ET75 (irrigated at %75 crop evapotranspiration, full season). The RWC of TiO2 0.25% and 0.50% treatments was the highest in the first and second measurements. Micronized calcite (CaCO3) 2.5% and 1.25% had a negative effect on RWC after the second treatment in severe drought conditions. However, there was no difference in ET75. The treatments had a significant effect on SPAD. The results of kaolin (KAO) 5% and CaCO3 1.25% treatments were significant, but the result was not clear.
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The study was funded by the Southeast Anatolia Project Regional Development Administration. All data underlying the results are available as part of the article and no additional source data are required.
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H. Denizhan, A. İkinci and F.E. Karaat declare that they have no competing interests.
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Denizhan, H., İkinci, A. & Karaat, F.E. Physiological Influences of Solid and Transparent Foliar Reflective Material Treatments in Almond Trees. Applied Fruit Science (2024). https://doi.org/10.1007/s10341-024-01059-y
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DOI: https://doi.org/10.1007/s10341-024-01059-y