Handbook for Irrigation of Wine Grapes in South Africa

Figure 7.18

Chapter 7

100 120 140 160 180 200

A

FC

PWP (80)

0 20 40 60 80

Soil water content (mm/60 cm) Sep Oct

Nov

Dec

Jan

Feb Mar

100 120 140 160 180 200

B

FC

0 20 40 60 80

PWP (90)

Soil water content (mm/60 cm) Sep Oct

Nov

Dec

Jan

Feb Mar

FIGURE 7.18. Seasonal soil water content where Shiraz/110 R in a fine sandy loam soil was drip irrigated (A) at 75% PAW depletion followed by DI during ripening and (B) at 90% PAW depletion followed by DI during ripening in the 2008/09 season near Robertson in the Breede River valley (Lategan, 2011). Dashed lines indicate field capacity, permanent wilting point and PAW depletion level.

IRRIGATION OF WINE GRAPES 205