PERFORMANCE OF GRAPEVINES UNDER IRRIGATION SYSTEMS - Management, Performance, and Applications of Micro Irrigation Systems - page 287

The cluster width increased by 4.7 in DIS and 3.5% in LHBIS compared to the
one in GPIS during 2002-2003. During the second season, the average increase was
3.2% in DIS and 2.1% in LHBIS compared to the one in GPIS. Based on the cluster
width, irrigation systems followed the descending order: DIS>LHBIS>GPIS for both
seasons. The differences between any two irrigation systems were signifi cant at the
5% level in both seasons. The cluster length increased by 6.8% in DIS and 6.2% in
LHBIS compared to the one in GPIS during the fi rst season. The average increase was
7.3 in DIS and 1.1% in LHBIS compared to the one in GPIS. There was signifi cant
difference among the irrigation systems at the 5% level in the two growing seasons.
Figure 24 shows that berry diameter increased by 32.9 in DIS and 24.1% in LHBIS
than the one in GPIS through the fi rst season. During the second season, the average
increase was 31.7 and 20.7% in DIS and LHBIS, respectively, compared to the one in
GPIS. Based on the berry diameter, irrigation systems can be written in the ascending
order of DIS>LHBIS>GPIS in both seasons.

FIGURE 24 Effects of irrigation systems on berry diameter (mm).

Figure 25 shows that the highest value of berry volume in DIS was 4.85 during
2002-2003, and 5.27 cm 3 ), respectively; and the lowest berry volume in GPIS was
2.06 in fi rst season and 2.31 cm 3 in the second season. LSD value at P = 0.05 show
that there were signifi cant differences in berry volume among all irrigation systems.
High value of berry volume in DIS and LHBIS system may be due to greater WUE
and FUE compared to DIS.