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ARS Home » Pacific West Area » Corvallis, Oregon » Horticultural Crops Production and Genetic Improvement Research Unit » Research » Publications at this Location » Publication #401963

Research Project: Water and Nutrient Management for Sustainable Production of Small Fruit and Nursery Crops

Location: Horticultural Crops Production and Genetic Improvement Research Unit

Title: Managing nutrient inputs and arbuscular mycorrhizal fungi in vineyards

item Schreiner, Roger - Paul
item TIAN, TIAN - University Of California Agriculture And Natural Resources (UCANR)
item KALAUNI, SANTOSH - Oregon State University
item Rippner, Devin
item Gillispie, Elizabeth

Submitted to: American Society of Enology and Viticulture Annual Meeting Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 3/29/2023
Publication Date: N/A
Citation: N/A

Interpretive Summary: N/A

Technical Abstract: Grapevine roots are heavily colonized by symbiotic arbuscular mycorrhizal fungi (AMF) that enhance nutrient uptake, especially phosphorus (P). However, their role in the uptake of other nutrients including nitrogen (N) and potassium (K) is unclear. Further, how fertilizers added to vineyards alter AMF and their ability to supply nutrients is important for developing sustainable nutrient management practices. Data from numerous vineyard trials and controlled greenhouse studies are summarized here in order to provide a clearer picture of how to best manage AMF and vine nutrition. In vineyard trials, N additions to soil but not to foliage have reduced AMF colonization in roots, and in some cases, this reduced vine P status. For P, foliar P additions in vineyards have reduced AMF colonization, and foliar P additions in greenhouse trials rapidly reduced arbuscules in roots. However, adding P fertilizer to soil in a recent vineyard study did not have a negative impact on AMF in roots. A recent trial has also indicated that K fertilizer additions to soil had no impact on AMF in roots. These results contrast with findings under controlled conditions, where we have shown that AMF vastly improve vine P uptake, often improve K uptake, but do not improve N uptake by grapevines. AMF have also improved uptake of zinc and copper in controlled studies. Soil N inputs appear to have an outsized impact on AMF in grapevines as compared to soil P or K, even though AMF do not appear to enhance vine N uptake. Therefore, soil N additions to vineyards should be managed carefully to maintain AMF and ensure that N use does not interfere with uptake of other nutrients. These findings will be discussed in light of sustainable nutrient management in vineyards and the regulation of AMF by grapevines.