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The ability of mycorrhizal and nonmycorrhizal 'Elliott' highbush blueberry (Vaccinium corymbosum L.) plants to acquire soil N under different preplant organic soil amendment regimes (forest litter, rotted sawdust, or no amendment) was investigated in a field experiment using 15 N labeled (NH4)2SO4. Plants inoculated with an ericoid mycorrhizal isolate, Oidiodendron maius Dalpe (UAMH 9263), had lower leaf 15 N enrichment and higher leaf N contents than noninoculated plants but similar leaf N concentrations, indicating mycorrhizal plants absorbed more nonlabeled soil N than nonmycorrhizal plants. Mycorrhizal plants produced more plant dry weight (DW) and larger canopy volumes. The effect of preplant organic amendments on the growth of highbush blueberry plants was clearly demonstrated. Plants grown in soil amended with forest litter produced higher DW than those in either the rotted sawdust amendment or no amendment. Plants grown in soils amended preplant with sawdust, the current commercial recommendation, were the smallest. Differences in the carbon to nitrogen ratio were likely responsible for growth differences among plants treated with different soil amendments. authors found that growth of highbush blueberry plants was reduced when soils were amended with rotted sawdust (Yang et al., 1998). A probable mechanism is competition for N by microbes involved in the breakdown of the sawdust. Therefore, it is likely that the ability of the host plant to acquire N is affected by the type of preplant organic matter, as well as by mycorrhizal infection level, and the characteristics of its fungal symbiont. Therefore, the following research was conducted to investigate the interactive effects of mycorrhizal infection and organic soil amendments on N acquisition in highbush blueberry under field conditions.

Interactive Effects of Mycorrhizal Inoculation and Organic Soil Amendments on Nitrogen Acquisition and Growth of Highbush Blueberry