บทคัดย่องานวิจัย

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Postharvest water stress of an early maturing plum.

Johnson, R. S.; Handley, D. F.; Day, K. R.;

Journal of Horticultural Science Year: 1994 Vol: 69 Issue: 6 Pages: 1035-1041 Ref: 14 ref.

1994

บทคัดย่อ

Postharvest water stress of an early maturing plum.

ABSTRACT

Postharvest water stress was imposed on a May-harvested plum (Prunus salicina cv. Red Beaut) growing on a San Jaoquin sandy loam with underlying hardpan over a 3-year period. Control trees were irrigated at approx equal to 100% ET. One stress treatment (T1) received 50% of the water applied to the control. The second stress treatment (T2) was subjected to cycles of on-and-off irrigation which varied from year to year. All treatments were fully irrigated at about 100% ET until harvest. Treatment T1 received about 30 cm less irrigation water than the control and showed no decrease in yield, fruit weight or fruit quality over 3 years. Treatment T2 received about the same amount of water as T1 in the first 2 years of the experiment and also showed no decrease in productivity. In the third year, T2 was irrigated only for a single 3-week period after harvest which saved >60 cm of applied water. The trees were extensively defoliated by the end of the season, showed some shoot and scaffold dieback, and

had reduced yields in the following year. Double fruit formation was low in all treatments and was not increased by stress. Stem water potential (SWP) measurements followed a consistent seasonal pattern in the control. In the final year of the experiment, SWP during the postharvest period correlated well with yield in the following spring. This suggests SWP might be useful for monitoring water stress, thus preventing a loss in productivity while saving some water.