Orchard floor management effects on nitrogen fertility and soil biological activity in a newly established organic apple orchard

  • L. Hoagland
  • L. Carpenter-Boggs
  • D. Granatstein
  • M. Mazzola
  • J. Smith
  • F. Peryea
  • J. P. Reganold
Original Paper

Abstract

This study addresses the often-competing goals of organic fertility and weed control by evaluating alternative orchard floor management strategies for their impact on N cycling, tree performance, and soil biological activity in a newly established apple (Malus domestica Borkh.) orchard. The standard tillage weed control practice resulted in satisfactory tree growth with desirable levels of leaf N and most other nutrients; however, soil biological activity did not improve. Maintenance of a living cover understory increased soil N concentration and availability and improved soil biological activity; however, tree growth was less than in other treatments likely in response to competition with the living cover understory for space and water. Application of wood chip mulch resulted in exceptional tree growth which may have resulted from greater water availability, but available soil N was lower, and consequently, tree leaf N concentration was low; in addition, soil biological activity was not improved. Clove oil organic herbicide provided poor weed control resulting in lower leaf N and tree growth and did not improve soil biological activity. Brassicaceae seed meal applications enhanced N availability and soil nematode abundance, but leaf N and many other nutrients were below desirable levels, and additional research is needed to optimize this treatment. We conclude that meeting the multiple objectives of weed control, optimal tree health, and increased soil biological activity may require employment of different orchard floor management strategies at different times during the life of the orchard.

Keywords

Living cover mulch Wood chip mulch Organic herbicide Brassicaceae seed meal 

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • L. Hoagland
    • 1
  • L. Carpenter-Boggs
    • 2
  • D. Granatstein
    • 2
  • M. Mazzola
    • 3
  • J. Smith
    • 4
  • F. Peryea
    • 5
  • J. P. Reganold
    • 1
  1. 1.Department of Crop and Soil SciencesWashington State UniversityPullmanUSA
  2. 2.Center for Sustaining Agriculture and Natural ResourcesWashington State UniversityPullmanUSA
  3. 3.USDA-ARS Tree Fruit Research LaboratoryWenatcheeUSA
  4. 4.USDA-ARS Land Management and Water ConservationPullmanUSA
  5. 5.Tree Fruit Research and Extension CenterWashington State UniversityWenatcheeUSA

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