In this research which was carried out inSuleymanDemirel University Research
and Application Farm during 2007 and 2008 years, apple leaf area index
(LAI) and leaf water potential (LWP) were observed in Jersey Mac (V1) and Williams
Pride (V2) young apple varieties budded on M9 rootstock irrigated with different
irrigation methods. Drip (D), subsurface drip (SD), surface (S) and undertree
micro sprinkler (M) irrigation methods were used in the research. The amount
of applied irrigation water was as much as 100% of Class A Pan evaporation
measured during five days irrigation intervals.
The amount of irrigation water was ranged between 348.3 (D, SD) – 1186
(S, M) mm depending on irrigation methods during the experimental years. Furthermore,
maximum and minimum crop evapotranspiration values were determined
as 426.1 (DV2) and 1334.7 (MV2) mm respectively.
LAI values related to treatments ranged from 0.32 to 0.52 in 2007, 0.73
to 1.12 in 2008. LAI values increased by approximately 126.3% for all treatments.
In both years, generally, the highest LAI values were observed in drip irrigation
(D) for both varieties. Linear correlation (r=0.99, n=16) was obtained between
fruit yields and leaf area index (LAI) values of the apple trees.
Leaf water potential (LWP) measurements were repeated one day before
and after irrigation during the irrigation period. The measurements were also conducted
once along a day in the middle of the season. Changes in value of LWP
were similar among the treatments.
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