Effect of Zn binding to phytate and humic substances on its uptake by wheat (Triticum durum L.) as affected by carbonates and Fe oxides

Although complexation with soil organic matter may improve zinc (Zn) bioavailability to plants, the effect of Zn sorbent surface on the use of complexed Zn by plants remains unknown. The objective of this research was to elucidate how Zn complexation with humic substances (HS) and phytate affects th...

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Bibliographic Details
Published in:Pedosphere 2022-12, Vol.32 (6), p.823-832
Main Authors: GARCÍA-LÓPEZ, Ana M., RECENA, Ramiro, DELGADO, Antonio
Format: Article
Language:English
Subjects:
Bioavailability
Biomass
calcareous growth medium
Carbonates
Complexation
Crop yield
Culture media
Diethylenetriamine pentaacetic acid
Growth media
Humic acids
Humic substances
Iron
micronutrient
Organic matter
organic phosphorus
Organic soils
Oxides
Plant growth
Sand
Soil organic matter
Sorbents
Surface irrigation
Triticum durum
Wheat
Zinc
Zinc sulfate
Zn availability
Zn deficiency
Zn sorbent surface
Zn source
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Summary:Although complexation with soil organic matter may improve zinc (Zn) bioavailability to plants, the effect of Zn sorbent surface on the use of complexed Zn by plants remains unknown. The objective of this research was to elucidate how Zn complexation with humic substances (HS) and phytate affects the uptake of Zn by wheat plants depending on the main sorbent surface in growth media, i.e., carbonates and Fe oxides. To this end, two pot experiments were performed, one using Fe oxide-coated siliceous as the siliceous growth medium sand and the other using a mixture of calcareous sand and siliceous sand as the calcareous growth medium. Each experiment involved three Zn sources, Zn-HS complex, Zn phytate, and ZnSO4. All sources were applied with surface irrigation at two Zn rates (0.25 and 2 mg kg−1 growth medium). The Zn-HS complex significantly increased Zn uptake by plants in both media, relative to the other two Zn sources, but no significant difference was observed between Zn phytate and ZnSO4. In the calcareous medium, Zn-HS complex and Zn phytate resulted in significantly higher dry biomass yields of wheat than ZnSO4. In the siliceous medium, spike and shoot dry biomass yields with Zn-HS complex at the low rate and Zn phytate at both rates were not significantly different from those with ZnSO4 at the high rate. After harvest, approximately 50% of the Zn applied as Zn-HS complex remained extractable by diethylenetriaminepentaacetic acid (DTPA), while this proportion was less than 20% for the other Zn sources. Thus, Zn-HS complex and Zn phytate are sources of available Zn for plants, and they are more effective than ZnSO4 in increasing plant growth, particularly when carbonates are the main Zn sorbent surface.
ISSN:1002-0160
2210-5107
DOI:10.1016/j.pedsph.2022.06.022