PERFORMANCE OF GRAPEVINES UNDER IRRIGATION SYSTEMS - Management, Performance, and Applications of Micro Irrigation Systems - page 277

20.3.2 VEGETATIVE GROWTH OF GRAPEVINES FOR DIFFERENT
IRRIGATION SYSTEMS
This section will include vegetative growth parameters of grapevines: leaf area
(cm 2 ), leaf dry weight (gm), branch number, branch length (cm) and pruning weight
(kg/fed).

20.3.2.1 LEAF AREA
Leaf area for both seasons is shown in Fig. 12 for each irrigation system. During
2002-2003, it was 143.6 cm 2 and highest in drip irrigation system (DIS) compared to
142.8 cm 2 in the low head bubbler irrigation system (LHBIS). The lowest value was
142.7 cm 2 for gated pipes irrigation system (GPIS). There was signifi cant difference
at the 5% level in leaf area between DIS from one side and both of LHBIS and GPIS
from the other side. During 2002-2003, it was 151 cm 2 and highest in DIS compared
to 148.6 cm 2 in LHBIS. The lowest value was 145.3 cm 2 for GPIS. There were sig-
nifi cant differences at the 5% level in leaf area between any two irrigation systems.
The increase in leaf area during 2003/2004 were 5.2, 4.1 and 1.8% in comparison with
season 2002/2003 in DIS, LHBIS, and GPIS, respectively.

FIGURE 12 Leaf area in each irrigation method during the 2002-2003 and 2003-2004.

20.3.2.2 LEAF DRY WEIGHT
In each DIS, LHBIS, and GPIS, the leaf dry weight was 1.52, 1.24, and 1.23 gm (sea-
son 2002/2003) and 1.83, 1.65 and 1.29 gm (season 2003/2004), respectively, (Fig.
13). In both seasons, the difference in leaf dry weight between any two-irrigation sys-
tems was significant at the 5% level. The increases in leaf dry weight for 2nd season
were 20.4, 33.1 and 4.9% in DIS, LHBIS and GPIS, respectively.