Growth and mycorrhizal development of potted white ash and black walnut fertilized by two methods

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Abstract
White ash (Fraxinus americana L.) and black walnut (Juglans nigra L.) seedlings were grown for 20 weeks in fumigated soil that was either infested with Glomus fasciculatus or noninoculated; they were fertilized with N, P, and N–P by soil or foliar application methods. Neither the method of fertilization nor fertilizers significantly affected the number of mycorrhizal infected root segments for either species grown in infested soil. Nitrate nitrogen was significantly higher in noninoculated soil than in inoculated soil; the reverse was true for foliar N. Though not statistically significant, phosphorus was lower in inoculated soil and higher in inoculated plants in comparison with noninoculated soil and plants. Both inoculation and foliar fertilization increased root mass and overall growth of seedlings. White ash appears to benefit more from mycorrhizal inoculation than black walnut does. The greater root mass of foliar-fertilized inoculated plants could be an important factor in increasing growth and survival of outplanted seedlings.

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