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Cover Crop and Root Pruning Effects on the Rooting Pattern of SO4 Rootstock Grafted to Cabernet Sauvignon

W. Gill Giese, Tony K. Wolf, Ciro Velasco-Cruz, Lucas Roberts
Am J Enol Vitic. January 2016 67: 105-115; published ahead of print November 03, 2015 ; DOI: 10.5344/ajev.2015.15066
W. Gill Giese
1Winemaker/viticulturist, Shelton Vineyards, Dobson, NC 27017
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  • For correspondence: ggiese@sheltonvineyards.com
Tony K. Wolf
2Director and Professor of Viticulture, AHS Jr. Agricultural Research and Extension Center, Virginia Tech, 595 Laurel Grove Rd., Winchester, VA 22602
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Ciro Velasco-Cruz
3Research Professor, Estadistica, Colegio de Posgraduados, Carretera Mexico-Texcoco Km. 36.5, Montecillo, Texcoco 56230, Estado de Mexico, Mexico
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Lucas Roberts
4Senior Consultant, The Hartford Financial Services Group, Inc., One Hartford Plaza, Hartford, CT 06155.
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Abstract

Root biomass, root intercepts, and root length density of SO4 rootstock grafted to Cabernet Sauvignon and exposed to under-trellis cover cropping (CC) and with or without root pruning (RP or NRP, respectively) were evaluated over three years. The CC treatments included tall fescue (Festuca arundinacea Shreb.) varieties KY-31, with and without RP, Elite II without RP, and an 0.9 m wide, under-trellis herbicide strip with KY-31 fescue inter-rows, with and without RP. Around 70% of grapevine root biomass was observed at ≤60 cm soil depth, regardless of treatment or year. KY-31 fescue/NRP vines had the most (96%) root biomass at ≤60 cm soil depth in 2008. Rooting depth distributions were fitted to the model Y = (1 − βd), where d is soil depth (cm), Y is the cumulative root fraction from the soil surface to depth d, and the unknown parameter β is a measure of soil vertical root distribution used as a response variable to test for treatment differences. All root distributions across treatments and years, except KY-31 fescue/NRP in 2008, generated β values greater than 0.970, similar to β values from other root distribution studies. The modest treatment impact on root biomass and distribution suggests that these mature grapevines adapted to CC and annual RP in this environment, and partially explains the minimal impact on soil water content and vine water potential previously reported from this experiment.

  • cover crops
  • grapevine
  • rooting depth
  • root distribution
  • root length density
  • root pruning
  • ©2016 by the American Society for Enology and Viticulture
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Cover Crop and Root Pruning Effects on the Rooting Pattern of SO4 Rootstock Grafted to Cabernet Sauvignon
W. Gill Giese, Tony K. Wolf, Ciro Velasco-Cruz, Lucas Roberts
Am J Enol Vitic.  January 2016  67: 105-115;  published ahead of print November 03, 2015 ; DOI: 10.5344/ajev.2015.15066

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Cover Crop and Root Pruning Effects on the Rooting Pattern of SO4 Rootstock Grafted to Cabernet Sauvignon
W. Gill Giese, Tony K. Wolf, Ciro Velasco-Cruz, Lucas Roberts
Am J Enol Vitic.  January 2016  67: 105-115;  published ahead of print November 03, 2015 ; DOI: 10.5344/ajev.2015.15066
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