SOLAR RADIATION INTERCEPTION AS A GUIDE TO THE DESIGN OF HORTICULTURAL PLANTINGS. II TWENTY YEARS EXPERIENCE WITH GRAPEVINES
This review covers the authors research experience over 20 years into the effect of sunlight on grapevines. This knowledge is being synthesised into training system design aiming to improve yield and quality and to facilitate mechanisation. Solar radiation fluxes have a dominating effect on grapevine physiology acting through photosynthetic, thermal and phytochrome response systems. Yield potential can be increased by more sunlight interception with better foliage display. Common New World training systems are relatively inefficient at radiation interception and have shaded interiors. Shade reduces fruit bud initiation which restricts yield. Within-canopy shade also has major effects on fruit composition and hence wine quality. Canopy microclimate can be manipulated by shoot positioning and by controlling shoot length, shoot vigour and shoot spacing. Phytochrome effects have recently been shown to be responsible for fruit composition responses to shade.
Smart, R.E. (1989). SOLAR RADIATION INTERCEPTION AS A GUIDE TO THE DESIGN OF HORTICULTURAL PLANTINGS. II TWENTY YEARS EXPERIENCE WITH GRAPEVINES. Acta Hortic. 240, 87-94