RT Journal Article
SR Electronic
T1 Cover Crop and Root Pruning Effects on the Rooting Pattern of SO4 Rootstock Grafted to Cabernet Sauvignon
JF American Journal of Enology and Viticulture
JO Am. J. Enol. Vitic.
FD American Society for Enology and Viticulture
SP 105
OP 115
DO 10.5344/ajev.2015.15066
VO 67
IS 1
A1 W. Gill Giese
A1 Tony K. Wolf
A1 Ciro Velasco-Cruz
A1 Lucas Roberts
YR 2016
UL http://www.ajevonline.org/content/67/1/105.abstract
AB 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.