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- W2588981010 abstract "Zinc deficiency is common in pecan ( Carya illinoinensis ) grown in alkaline, calcareous soils. Zinc (Zn)-deficient pecan leaves exhibit interveinal chlorosis, decreased leaf thickness, and reduced photosynthetic capacity. Low photosynthesis (P n ) contributes to restricted vegetative growth, flowering, and fruiting of Zn-deficient pecan trees. Our objectives were to measure effects of soil-applied ethylenediaminetetraacetic acid (EDTA)-chelated Zn fertilizer on gas exchange of immature ‘Wichita’ pecan and characterize the relationship between leaf Zn concentration and P n . The study orchard had alkaline and calcareous soils and was planted in Spring 2011. Zinc was applied throughout each growing season as Zn EDTA through microsprinklers at rates of 0 (Control), 2.2, or 4.4 kg·ha −1 Zn. Leaf gas exchange and SPAD were measured on one occasion in the 2012 growing season, four in 2013, and five in 2014. Soil Zn-EDTA applications significantly increased the leaf tissue Zn concentration throughout the study. On all measurement occasions, net P n was significantly increased by soil-applied Zn EDTA compared with the control, but P n was not different between the two soil-applied Zn-EDTA treatments. Leaf P n in midseason did not increase at leaf tissue Zn concentrations above 14–22 mg·kg −1 . Leaf SPAD consistently followed a similar pattern to P n . Soil Zn-EDTA application increased leaf stomatal conductance ( g S ) compared with the Control early through midseason but not after August. Intercellular CO 2 concentration was significantly lower for Zn-EDTA-treated trees than the Control even on dates when there was no significant difference in g s , which suggests that soil application of Zn-EDTA alleviated nonstomatal limitations to P n caused by Zn deficiency." @default.
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- W2588981010 date "2017-01-01" @default.
- W2588981010 modified "2023-10-14" @default.
- W2588981010 title "Soil-application of Zinc-EDTA Increases Leaf Photosynthesis of Immature ‘Wichita’ Pecan Trees" @default.
- W2588981010 doi "https://doi.org/10.21273/jashs03938-16" @default.
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