DEFICIT IRRIGATION OF CHARDONNAY GRAPEVINES DURING FLOWERING
Deficit irrigation of Chardonnay grapes from bud burst through flowering, set and cell division was investigated. The aim was to establish a canopy without excessive vigour and without loss of yield through poor set and berry development. Three irrigation levels (0%, 57.5% and 100% of potential evapotranspiration) were applied from bud burst until six weeks after cap fall. An average soil matric potential of -1.76 bar from gypsum blocks installed at 30, 60 and 90 cm depth in the non-irrigated vines developed during flowering at a rate of -0.04 bar/day. By the end of the irrigation deficit period the average soil matric potential in the non-irrigated treatment was -3.12 bar. There was no loss in yield, berry number or berry fresh weight, dry weight, pH, total titrateable acid (TTA) and sugar. Shoot internode length and vine butt circumference were also unaffected.
Goodwin, I. and Jerie, P. (1989). DEFICIT IRRIGATION OF CHARDONNAY GRAPEVINES DURING FLOWERING. Acta Hortic. 240, 275-278