Comparison of the penetration of primary and lateral roots of pea and different tree seedlings growing in hard soils

Article


Azam, Gausul, Grant, Cameron D., Murray, Robert S., Nuberg, Ian K. and Misra, Rabindra K.. 2014. "Comparison of the penetration of primary and lateral roots of pea and different tree seedlings growing in hard soils." Soil Research. 52 (1), pp. 87-96. https://doi.org/10.1071/SR13201
Article Title

Comparison of the penetration of primary and lateral roots of pea and different tree seedlings growing in hard soils

ERA Journal ID5248
Article CategoryArticle
AuthorsAzam, Gausul (Author), Grant, Cameron D. (Author), Murray, Robert S. (Author), Nuberg, Ian K. (Author) and Misra, Rabindra K. (Author)
Journal TitleSoil Research
Journal Citation52 (1), pp. 87-96
Number of Pages10
Year2014
PublisherCSIRO Publishing
Place of PublicationMelbourne, Australia
ISSN0004-9573
1446-568X
1838-675X
1838-6768
Digital Object Identifier (DOI)https://doi.org/10.1071/SR13201
Abstract

Establishment and survival of tree seedlings in hard soils depends on production of deep root systems. This study evaluated the primary and lateral roots of an annual crop and several tree species growing in soils of varying strength. We grew peas and acacias by direct seeding, plus three eucalypts by direct seeding and transplanting, and measured various root characteristics. At all levels of soil compaction, the primary roots of acacia were thicker and they elongated faster than did those of the eucalypts. However, lateral roots of transplanted eucalypts elongated faster than their primary roots, and the rate of root elongation was negatively correlated with soil penetration resistance, especially for Eucalyptus camaldulensis. The primary root diameter of all plants increased with increasing penetration resistance, but acacia roots continued to elongate faster than pea roots. Pea plants produced most of their roots in the top 5cm, whereas tree roots were more uniformly distributed with depth. Although not statistically significant at P≤0.05, the relative rate of root elongation in very hard soil correlated modestly (P≤0.11) with the maximum root growth pressure of four tree species. These variations in root growth behaviour can be related to the intrinsic variability of root characteristics for each plant species and the natural abundance of each species in different environments.

KeywordsAcacia; compaction; direct seeding; Eucalyptus; Pisum; root penetration; transplanting
ANZSRC Field of Research 2020310806. Plant physiology
410605. Soil physics
300709. Tree improvement (incl. selection and breeding)
Public Notes

© CSIRO 2014. Permanent restricted access to published version due to publisher copyright policy.

Byline AffiliationsUniversity of Adelaide
National Centre for Engineering in Agriculture
Institution of OriginUniversity of Southern Queensland
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