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The effects of eight summer cover crop treatments combined with two arbuscular mycorrhizal (AM) fungal inoculants on strawberry growth and yields were examined in a 2-year field experiment. Cover crop treatments included 1) sudangrass (Sorghum bicolor (L.) Moench cv. Piper); 2) pearl millet (Pennisetum glaucum (L.) R.Br. cv. 102 M Hybrid); 3) soybean (Glycine max (L.) Merrill cv. Laredo); 4) velvetbean (Mucuna deeringiana (Bort) Merr. cv. Georgia Bush); 5) sudangrass/velvetbean combi- nation; 6) pearlmillet/soybean combination; 7) anon-mycorrhizal hostconsisting ofrape (Brassica napus L. var. napus cv. Dwarf Essex) and buckwheat (Fagopyrum esculentum Moench) in Year 1 and Year 2, respectively; and 8) no cover crop control. Strawberry tips were inoculated with either a native mixture of several AM fungal species or a single species sold commercially, Glomus intraradices. Cover crop treatments were assessed for their aboveground biomass and nutrient uptake as well as their impacts on weed abundance and diversity, soil nutrients, and parasitic nematode populations. Cover crop and AM treatments were assessed for their impact on strawberry growth, yields, AM root colonization, and nutrient uptake. Grass-based cover crop treatments, particularly pearl millet, produced the most aboveground biomass. In both years, all cover crop treatments reduced summer weed biomass compared with the control. Neither cover crop nor AM treatments had an effect on overall strawberry plant growth or yields in either year, although some differences existed at specific growth periods. The results suggest that cover crops are a viable strategy for reducing summertime weeds and that background, native populations of AM fungi in the soil may be just as effective as a commercially available species. It is likely that no overall yield benefit was found among treatments for tworeasons: 1) nutrients, especially nitrogen, were notlimiting; and 2) the cover crop growth window may have been too short for a significant impact on straw- berries over two seasons.

Influence of Summer Cover Crops and Mycorrhizal Fungi on Strawberry Production in the Southeastern United States