Summer deficit irrigation in a hedgerow olive orchard cv. Arbequina: relationship between soil and tree water status, and growth and yield components

  • M. Gómez-del-Campo Dpto. Producción Vegetal: Fitotecnia. Universidad Politécnica de Madrid. Ciudad Universitaria sn. 28040 Madrid
Keywords: Olea europaea L., stem water potential, threshold values for irrigation management, vegetative and fruit growth, oil production

Abstract

Stem water potential (Phi-stem) is a useful tool for irrigation scheduling in tree crops, provided threshold values for growth and production are determined for each physiological period. Four irrigation treatments were evaluated in a hedgerow olive orchard. Control (CON) was irrigated using soil water sensors to maintain the root zone close to field capacity. Severe water deficits were applied by irrigating at 30% CON from end of fruit drop to end of July (DI-J) or from end of July until beginning of oil synthesis (DI-A). Less severe water deficit was applied in July and August by irrigating at 50% CON (DI-JA). Continuous measures of soil moisture, Phi-stem and shoot length were recorded in all treatments. Fruit dry weight and oil content were measured at the end of the experimental period and at harvest. Relative extractable soil water to 0.8 m depth (REW) and Phi-stem were highly correlated and influenced by irrigation treatment. Shoot growth, fruit characteristics and oil production were correlated to Phi-stem. Shoot growth was reduced by 50% relative to CON by irrigating at Phi-stem of -1.3 MPa. Fruit dry matter and oil content (g fruit-1) were linearly reduced as mean summer Phi-stem decreased. Oil production was highly related with Phi-stem in August but not in July. Water can be saved in July by irrigating at Phi-stem of -2.9 MPa but Phi-stem should be maintained higher than -2.0 MPa in August to prevent decrease of oil production.

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References



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Published
2013-04-24
How to Cite
Gómez-del-Campo, M. (2013). Summer deficit irrigation in a hedgerow olive orchard cv. Arbequina: relationship between soil and tree water status, and growth and yield components. Spanish Journal of Agricultural Research, 11(2), 547-557. https://doi.org/10.5424/sjar/2013112-3360
Section
Water management