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    Examination of black walnut seedlings grown in forest and field soils showed all root systems were infected with mycorrhizae; the amount of infection was influenced by treatments. Mean height and dry weight of tops and roots were greater for seedlings grown in forest than field soil. Seedling height growth was not increased by disturbing either soil; but, root dry weight was significantly increased by disturbing the field soil.

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    Ponder, Felix Jr. 1979. Soil Structure and Mycorrhizae Encourage Black Walnut Growth on Old Fields. Research Note NC-249. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station


    Endomycorrhizal fungi, bulk density sampling, soil sterilization

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