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Spatial and Temporal Nutrient Dynamics and Water Management of Huanglongbing-Affected Mature Citrus Trees on Florida Sandy Soils

Author

Listed:
  • Alisheikh A. Atta

    (Southwest Florida Research and Education Center, University of Florida, 2685 SR 29 N, Immokalee, FL 34142, USA)

  • Kelly T. Morgan

    (Soil and Water Sciences Department, University of Florida, 2157 McCarty Hall, Gainesville, FL 32611, USA)

  • Davie M. Kadyampakeni

    (Citrus Research and Education Center, 700 Experiment Station Rd., Lake Alfred, FL 33850, USA)

Abstract

Nutrients are vital for plant growth, development, and aid in disease control because nutrients affect host plant and pathogen interactions. Once a citrus tree is infected with the phloem-limited, Gram-negative bacteria, Candidatus Liberibacter asiaticus ( C Las), huanglongbing (HLB; citrus greening), it would fall under threat of survival as the disease has no known control mechanism discovered thus far. The objective of this study was to determine if split soil applications of essential nutrients improve the availability and accumulation, reduce leaching of these nutrients beyond the root zone, and promote root growth and water dynamics of HLB-affected citrus trees in the soil–plant–atmosphere continuum. Split soil applications of three N rates (168, 224, and 280 kg ha −1 year −1 ) were the main blocks. Micronutrients were randomly applied to the sub-blocks assigned in a split-split plot design, applied in three splits annually. The micronutrients were applied to foliage and soil as follows: foliar only 1× (1×), foliar 1× and soil-applied 1× (2×), and foliar 1× and soil-applied 2× (3×)× (1× = 9 kg ha −1 year −1 of Mn and Zn to each foliar and soil along with 2.3 kg ha −1 year −1 of B). Significant soil NH 4 -N and NO 3 -N, Zn, and Mn were retained within the active soil root zone (0–30 cm). Higher soil acidity was detected when trees received the highest micronutrient rate in the upper soil layers (0–15 cm) as compared with the middle (15–30 cm) and the lowest (30–45 cm) soil layers. Fine root length density (FRLD) was significantly lower at the highest micronutrient rates, manifesting root growth negatively associated with high Mn and low soil pH. Invariably, the water dynamics: stem water potential (ψ stem ), stomata conductance ( g s ), and sap flow were also negatively affected when trees received foliar 1× and soil 2× (3×) treatment as compared with the other treatments. Split application of nutrients had a significant effect on FRLD growth, retaining soil-applied nutrients within the active root zone, and improved water use efficiency.

Suggested Citation

  • Alisheikh A. Atta & Kelly T. Morgan & Davie M. Kadyampakeni, 2022. "Spatial and Temporal Nutrient Dynamics and Water Management of Huanglongbing-Affected Mature Citrus Trees on Florida Sandy Soils," Sustainability, MDPI, vol. 14(12), pages 1-18, June.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:12:p:7134-:d:835899
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    References listed on IDEAS

    as
    1. Said A. Hamido & Kelly T. Morgan, 2021. "The Effect of Irrigation Rate on the Water Relations of Young Citrus Trees in High-Density Planting," Sustainability, MDPI, vol. 13(4), pages 1-18, February.
    2. Abrisqueta, J.M. & Mounzer, O. & Álvarez, S. & Conejero, W. & Garci­a-Orellana, Y. & Tapia, L.M. & Vera, J. & Abrisqueta, I. & Ruiz-Sánchez, M.C., 2008. "Root dynamics of peach trees submitted to partial rootzone drying and continuous deficit irrigation," Agricultural Water Management, Elsevier, vol. 95(8), pages 959-967, August.
    3. Qudus O. Uthman & Davie M. Kadyampakeni & Peter Nkedi-Kizza & Neriman T. Barlas & Alisheikh A. Atta & Kelly T. Morgan, 2020. "Comparative Response of Huanglongbing-Affected Sweet Orange Trees to Nitrogen and Zinc Fertilization under Microsprinkler Irrigation," Agriculture, MDPI, vol. 10(10), pages 1-15, October.
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