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Influence of subsoil zinc on dry matter production, seed yield and distribution of zinc in oilseed rape genotypes differing in zinc efficiency

Plant and Soil volume 192, pages 181–189 (1997)Cite this article

Abstract

The effects of Zn supply (+Zn: 1 mg kg−1 soil, -Zn: no Zn added) in subsoil were examined in three genotypes of Brassica napus (Zhongyou 821, Xinza 2, Narendra) and one genotype of Brassica juncea (CSIRO-1) in a glasshouse experiment in pots (100 cm long, 10.5 cm diameter). The topsoil (upper 20 cm soil in pots) was supplied with Zn in all treatments whereas Zn was either supplied or omitted from the subsoil. Supplying Zn to subsoil significantly increased the root growth in the lower zone, markedly decreased the number of aborted and unfilled pods plant−1 and significantly increased the number of developed pods plant−1, number of seeds pod−1, individual seed weight and overall seed yield. Subsoil Zn also significantly increased the Zn concentration and Zn content of seed and improved the ratio of Zn uptake by seed to total Zn uptake by seed and shoots. These effects of subsoil Zn were more pronounced in Zhongyou 821, Xinza 2 and Narendra compared with CSIRO-1. CSIRO-I had 92% Zn efficiency (ratio of -Zn subsoil seed yield to +Zn subsoil seed yield expressed in percentage) compared with 63% for Zhongyou 821. Among the four genotypes, CSIRO-1 had the lowest Zn concentration in roots and shoots but highest Zn concentration and content in seed, suggesting it has a superior Zn transport mechanism from source (roots) to sink (seed). CSIRO-1 also significantly decreased the rhizosphere pH in lower rooting zone (20-93 cm) in -Zn subsoil treatment compared with +Zn treatment.

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Authors and Affiliations

  1. Department of Plant Science, Waite Agricultural Research Institute, University of Adelaide, GLen O.mond, S.A, 5064, Australia

    Harsharn Singh Grewal & Robin D Graham

  2. Soil and Fertilizer Institute, Hubei Academy of Agricultural Sciences, Wuhan, 430064, China

    Lu Zhonggu

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  1. Harsharn Singh Grewal
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  2. Lu Zhonggu
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  3. Robin D Graham
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Grewal, H.S., Zhonggu, L. & Graham, R.D. Influence of subsoil zinc on dry matter production, seed yield and distribution of zinc in oilseed rape genotypes differing in zinc efficiency. Plant and Soil 192, 181–189 (1997). https://doi.org/10.1023/A:1004228610138

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  • DOI: https://doi.org/10.1023/A:1004228610138

  • oilseed rape
  • rhizosphere pH
  • root growth
  • subsoil Zn
  • Zn efficiency
  • Zn uptake