Agriculture Reference
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FIGURE 15
Effect of type of irrigation system on branch length.
20.3.2.3 NUMBER OF BRANCHES
Number of branches per grapevine (Fig. 14) was 6, 5, and 4 in DIS, LHBIS and GPIS,
respectively, during 2002/2003. Number of branches per grapevine was 8, 7, and 6 in
DIS, LHBIS and GPIS, respectively, during 2003/2004. The difference in number of
branches/vine between DIS and GPIS was significant at the 5% level only at the 1st
season. The increase in number of branches/vine was 33.33, 40 and 50% in DIS, LH-
BIS and GPIS, respectively, during 2nd season compared to the 1st season.
20.3.2.4 BRANCH LENGTH
Figure 15 shows the effects of irrigation systems on branch length (cm). In DIS, LH-
BIS, and GPIS, the branch length was 342.4, 338.5, and 320 cm during the first season
and 343.6, 335, and 326 cm during the 2nd season, respectively. Based on the branch
length, irrigation systems were in the following ascending order: GPIS<LHBIS<DIS
in both seasons. There were significant differences in branch length between any two
irrigation systems, in both seasons. The changes in branch length at the 2nd season
relative to the 1st one were 0.35, −1.03 and 1.88% for DIS, LHBIS and GPIS, respec-
tively. The small changes and the negative one can be attributed to variation in vine
pruning process.
20.3.2.5 PRUNING WEIGHT
Pruning weights (PW) for two seasons are shown in Fig. 16. In under DIS, LHBIS,
and GPIS, the PW was 984, 978 and 959 kg/fed during first season; and 1190, 1176
and 1066 kg/fed during the 2nd season, respectively. The PW for DIS exceeded that
the value for GPIS. Based on pruning weights, the irrigation systems can be arranged
in the following ascending order: GPIS<LHBIS<DIS. Difference in pruning weights
between any two irrigation systems were significant at the 5% level except those be-
tween LHBIS from one side and both DIS and GPIS from the other side at the 1st
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