Oat residue and soil compaction influences on common root rot (Aphanomyes euteiches) of peas in a fine-textured soil

V. A. Fritz, R. R. Allmaras, F. L. Pfleger, D. W. Davis

    Research output: Contribution to journalArticlepeer-review

    20 Scopus citations

    Abstract

    Management of common root rot (Aphanomyces euteiches Drechs.) in peas (Pisum sativum L.) is sought primarily by host crop avoidance for several years. Soil compaction is known to aggravate A. euteiches disease in peas but effects on infection and subsequent symptom development are not sufficiently known to assist in cultural control. Several isolated observations have noted that oat crop residues may suppress A. euteiches infection and disease in pea roots. The individual and combined influence (a factorial combination of two factors each at two levels) of a prior oat crop and soil compaction were studied for their effects on common root rot severity in processing peas grown in an A. euteiches disease nursery on a fine-textured soil in the northern Corn Belt of the USA. A previous crop of summer oats relative to prior-year peas significantly suppressed common root rot and increased pea fresh vine weight 210% at peak bloom stage. Both fresh vine weight and green pea yield were reduced as much as 63% by soil compaction and increased as much as 48% by a prior oat crop. Greater soil bulk density at the 10 to 25-cm depth identified wheel traffic compaction patterns in each year. A 10-fold reduction of saturated hydraulic conductivity in the 10 to 25-cm compacted zone and high soil-water potentials within the upper 60 cm both confirmed an impaired water drainage, especially during infiltration events. These observations support the use of a previous full season or summer oat crop jointly with chisel plowing, plus the prevention of excessive traffic during secondary tillage and planting, to reduce common root rot in a field infested with A. euteiches. Shallow incorporation of oat shoot and root residue by chiseling could be a crucial component of the cultural control of the disease. R Rodriguez Kabana Section editor

    Original languageEnglish (US)
    Pages (from-to)235-244
    Number of pages10
    JournalPlant and Soil
    Volume171
    Issue number2
    DOIs
    StatePublished - Apr 1995

    Bibliographical note

    Copyright:
    Copyright 2007 Elsevier B.V., All rights reserved.

    Keywords

    • bulk density
    • cultural control
    • green pea yield
    • root disease rating
    • soil hydraulic properties
    • traffic patterns
    • vine growth

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