Plant-Water Relationships and Growth of Black Walnut in a Walnut-Forage Multicropping Regime

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Abstract:

Eastern black walnut seedlings were planted on a 1.5 x 1.5 m spacing in the spring of 1976 and irrigated throughout the growing season. During the spring of 1977, forage plots consisting of Kentucky 31 tall fescue, orchard grass, or Kobe lespedeza measuring 1 m wide and 10.2 m long and centered on a row of trees, were established with and without irrigation. Soil-water relationships measured throughout the 1977 growing season demonstrated lower Ψs, on the average, in irrigated than in nonirrigated plots during drought periods. Differences were attributed to the greater physiological vigor, thus greater transpiration, of forages growing under irrigated conditions. At the 45 cm depth, Ψs dropped to a low during August of -3.0 MPa with irrigation and only -0.8 MPa without. Predawn xylem pressure potentials of walnut seedlings however, were consistently lower on forage plots without irrigation. Significant decreases in dry weights of walnut grown with forages were associated with reductions in Ψ1 and increases in anthracnose infection. For. Sci. 33(1):70-80.

Keywords: Irrigation; Juglans nigra L; Kobe lespedeza; orchard grass; tall fescue

Document Type: Journal Article

Affiliations: Professor, School of Forestry, Fisheries and Wildlife, University of Missouri, Columbia, MO 65211

Publication date: March 1, 1987

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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