作者： S. Kaan Kurtural , Geoffrey Dervishian , Lydia F. Wessner
DOI:
关键词: Veraison 、 Canopy 、 Wine grape 、 Vegetative reproduction 、 Shoot 、 Pruning 、 Cultivar 、 Mathematics 、 Thinning 、 Horticulture
摘要: A trial in the San Joaquin Valley of California investigated how interaction pruning systems and mechanical shoot thinning affected canopy performance, yield components, fruit phenolic composition at harvest, production efficiency a pro- cumbent cultivar warm climate grape-growing region. Two three treatments were arranged factorially randomized complete block design with four replications. The methods applied by either hand- to target 25 nodes/m or mechanically hedging retaining 100-mm spur height. density modified Eichhorn- Lorenz scale, stage 17 retain 40 45 shoots/m row, left unthinned. contribution count shoots total increased when box replaced pruning. percent was greatest unthinned treatments. photosynthetically active radiation (PAR) transmission gaps also decrease per meter row. Berry cluster size decreased application. However, because box-pruned vines carried more clusters, row increased. There quadratic response where berry skin phenolics, an- thocyanins, tannins treatment compared 40shoots/mandunthinnedtreatments.Pruningweightpermeterofrowandleafarea-to- ratio decreased, whereas Ravaz Index (kg yield/kg weight) Shoot did not affect weight leaf area-to-fruit ratio. Increasing amount PAR resulted vegetative compensation from sparsely populated grapevine canopy, thereby negating its purported effects. repopulated rapidly non-count increasing pruningweight ofrow atthe endof theseason. Inthe absenceof aphysiological response, procumbent is recommended. Mechanically height slowing down growth irrigating 50% daily evapotranspiration (ETo) variance between set veraison have window (5 10 kg·kg L1 ) recommended for red wine grape cultivars region similar better accumulation than spur-pruned vines.