Handbook for Irrigation of Wine Grapes in South Africa

Chapter 8

Figure 8.16

A

B

C

0 10 20 30 40 50 60 70 80 Soil Water matric potential (-kPa ) 19/09

10/11 12/12 10/01 09/02

23/03

Refill

Field capacity

1 Sep 1 Oct 31 Oct 30 Nov 30 Dec 29 Jan 28 Feb 30 Mart 29 Apr 29 May

FIGURE 8.16. Examples of (A) the accumulated ET graphic output of the VINET model for a flood irrigated wine grape vineyard in a sandy soil near Eksteenskuil in the Lower Orange River region, (B) after the simulation was adjusted for an untimely irrigation applied in September and (C) the actual soil matric potential.

IRRIGATION OF WINE GRAPES 249