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Occlusive effect of soil aggregates on increased soil DTPA-extractable zinc under low soil pH causedby long-term fertilization

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  • Z. Guo

    (Soiland Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei, Anhui, P.R. China
    Key Laboratory of Nutrient Cycling and Resources Environment of AnHui Province,)

  • X. Guo

    (Soiland Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei, Anhui, P.R. China
    Key Laboratory of Nutrient Cycling and Resources Environment of AnHui Province,)

  • J. Wang

    (Soiland Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei, Anhui, P.R. China
    Key Laboratory of Nutrient Cycling and Resources Environment of AnHui Province,)

  • D. Wang

    (Soiland Fertilizer Research Institute, Anhui Academy of Agricultural Sciences, Hefei, Anhui, P.R. China
    Key Laboratory of Nutrient Cycling and Resources Environment of AnHui Province,)

Abstract

To investigate the effect of low soil pH caused by fertilization on soil available zinc in calcareous soil, this study was conducted based on a long-term experiment consisting of: (a) no fertilization (CT); (b) mineral fertilizer application coupled with 7500 kg/ha of wheat straw (WS-NPK); (c) mineral fertilizer application coupled with 3750 kg/ha of wheat straw (1/2WS-NPK); (d) mineral fertilizer application alone (NPK). Long-term fertilization results in a significant increase in soil DTPA-extractable zinc. However, the increased soil DTPA-extractable zinc is unavailable to crops and mainly confined to 0.25 mm > and 0.25 mm to 1 mm aggregates. Compared to CT, soil DTPA-extractable zinc under fertilization is more than 9.67% and 122.36% higher in 0.25 mm > and 0.25 mm to 1 mm aggregates, respectively. Furthermore, plant-available zinc in the 0-15 cm soil layer and wheat grain zinc are both significantly positive related to soil DTPA-extractable zinc in > 2 mm aggregates. Therefore, plant-available zinc in the 0-15 cm layer is closely associated with DTPA-extractable zinc in > 2 mm aggregates, and the low soil pH caused by long-term fertilization could not enhance plant-available zinc in the surface soil layer nor elevate wheat grain zinc concentration because of the occlusive effect of soil aggregates.

Suggested Citation

  • Z. Guo & X. Guo & J. Wang & D. Wang, 2013. "Occlusive effect of soil aggregates on increased soil DTPA-extractable zinc under low soil pH causedby long-term fertilization," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 59(11), pages 524-529.
    • Handle: RePEc:caa:jnlpse:v:59:y:2013:i:11:id:489-2013-pse
    DOI: 10.17221/489/2013-PSE
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    References listed on IDEAS

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    1. Z. Guo & D.Z. Wang, 2013. "Long-term effects of returning wheat straw to croplands on soil compaction and nutrient availability under conventional tillage," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 59(6), pages 280-286.
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