PERFORMANCE OF GRAPEVINES UNDER IRRIGATION SYSTEMS - Management, Performance, and Applications of Micro Irrigation Systems - page 285

juice volume during 2003-2004 was 15.2, 14.3 and 14.40% in DIS, LHBIS, and GPIS
compared to 2002-2003, respectively.
For both seasons and each irrigation system, sugar percentage (prix number) is
shown in Fig. 21. During 2002-2003, it was 21.8 prix and highest in DIS, followed
by 21.1 prix in LHBIS. The lowest sugar percentage was 20.2 prix for GPIS. During
2003-2004, it was 23 prix and highest in DIS, followed by 21.5 prix in LHBIS. The
lowest sugar percentage was 21 prix for GPIS. LSD at P = 0.05 was 0.02 showing
signifi cant differences in sugar content among all irrigation systems. High content of
sugar percentage in the DIS and LHBIS system may be due to greater values of WUE
and FUE compared to the values in GPIS. The sugar percentage during 2003/2004
exceeded that for 2002/2003 by 5.5, 1.86 and 3.96% in DIS, LHBIS, and GPIS, re-
spectively. For both seasons and each irrigation system, TSS (prix number) is shown
in Fig. 22.
FIGURE 21 Effects of irrigation methods on sugar content in grape berry during 2002-2003
and 2003-2004.