Handbook for Irrigation of Wine Grapes in South Africa

Figure 7.12

Sep

Oct

Nov

Dec

Jan

Feb

-90 -80 -70 -60 -50 -40 -30 -20 -10 0 Soil water matric potential (kPa) 50% RAW depletion 75% RAW depletion

FIGURE 7.12. Seasonal variation in soil water matric potential where Sauvignon blanc and Pinotage in the Breede River Valley region were irrigated at two RAW depletion levels which correspond to medium irrigation frequencies (Myburgh, 2011c).

100 120 140 160 180 200

FC

(80) PWP

0 20 40 60 80

Soil water content (mm/60 cm) Sep Oct

Nov

Dec

Jan

Feb Mar

190 CHAPTER 7 – IRRIGATION STRATEGIES