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- W4239663731 abstract "This study investigated the effects of radiation heat‐load reduction by shading on the growth and development of citrus trees in a warm subtropical region. The experiment was conducted from mid‐June until late October when daily maximal air temperature averaged 29.3 °C. Two‐year‐old de‐fruited Murcott tangor (Citrus reticulata Blanco×Citrus sinensis (L.) Osb.) trees were grown under 30% or 60% shade tunnels, or 60% flat shade (providing midday shade only), using highly reflective aluminized nets. Non‐shaded trees were used as the control. Shading reduced direct more than diffuse radiation. Daily radiation was reduced by 35% for the 30% Tunnel and 60% Flat treatments, and by 55% for the 60% Tunnel. Two days of intensive measurement showed that shading increased average sunlit leaf conductance by 44% and photosynthesis by 29%. Shading did not significantly influence root and stem dry weight growth, but it increased the increment in leaf dry weight during the three month period by an average of 28% relative to the control, while final tree height in the 30% Tunnel treatment exceeded the control by 35%. Shoot to root and shoot mass ratios increased and root mass ratio decreased due to shading because of the increase in leaf dry weight. Shading increased starch concentration in leaves while the shadiest treatment, 60% Tunnel, decreased starch concentration in the roots. Carbon isotope ratio (δ13C) of exposed leaves that developed under shading was significantly reduced by 1.9‰ in the 60% Tunnel, indicating that shading increased CO2 concentrations at the chloroplasts (Cc), as would be expected from increased conductance. Substomatal CO2 concentrations, Ci, computed from leaf net CO2 assimilation rate and conductance values, also indicate that shading increases internal CO2 concentrations. Based on tree dry mass, tree height, and total carbohydrates fractions, the 30% Tunnel and the 60% Flat were the optimal shade treatments." @default.
- W4239663731 created "2022-05-12" @default.
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- W4239663731 date "2003-01-02" @default.
- W4239663731 modified "2023-10-14" @default.
- W4239663731 title "Increased growth of young citrus trees under reduced radiation load in a semi-arid climate1" @default.
- W4239663731 doi "https://doi.org/10.1093/jxb/54.381.365" @default.
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