|Author:||Lakso, A. N. ; Eissenstat, D. M. ; Comas, L. ; Dunst, R.|
|Book Group Author:||NA|
Fine root production was monitored since 1997 in a trial established in 1990 in a 24-year-old Vitis labruscana cv. Concord vineyard in New York, USA, to examine the effects of pruning, irrigation/drought, and the interactions on fine root production. The pruning treatments were: balance pruned (44 nodes/kg of cane pruning weight from the previous season); 80 node constant (80 nodes/vine every year); and minimally pruned (only a low hedging cut at 1 m). The irrigation treatments were no irrigation and supplemental irrigation (applied as drip irrigation at weekly intervals when needed). Observations were made at 14-day intervals from early April until December each year to determine when new fine roots were produced. Minimal pruning gave 41 and 28% increases in yield over the balance and 80 Node pruning treatments, respectively. In addition, irrigation gave no significant effect on yields of balance or 80 Node-pruned vines, but gave a 9% or 22 Mt/ha increase in mean annual yields. New roots could be produced at many times during the season between April and November, but peak root production occurred around bloom in June and again before veraison in late July and early August. In dry years, new root production was inhibited in dry soil, especially during July and August when droughts are typically the most severe in the Northeast. In wet years, the number of new roots produced was similar, but in a very dry year (1999), the non-irrigated vines produced only ~1/3 as many roots. The pruning regimes had no apparent effect on new root production.
|Pages:||32 - 34|
|Journal:||International Water & Irrigation|
crop yield, drought, drought resistance, grapes, irrigation,plant water relations, pruning, rooting, roots, seasonal variation,vineyards, New York, USA, Vitis, Vitidaceae, Rhamnales, dicotyledons,angiosperms, Spermatophyta, plants, eukaryotes, Vitis, Middle AtlanticStates of USA, Northeastern States of USA, USA, North America, America,Developed Countries, OECD Countries, drought tolerance, seasonalchanges, seasonal fluctuations, United States of America, Vitaceae,Vitadaceae, Vitis labruscana, watering, Horticultural Crops (FF003) (NewMarch 2000), Plant Physiology and Biochemistry (FF060), Plant WaterRelations (FF062), Plant Production (FF100), Environmental Tolerance ofPlants (FF900), Soil Water Management (Irrigation and Drainage) (JJ800)(Revised June 2002) [formerly Soil Water Management]