Funding Agency: USAID

Project Duration:2017-2021

Implementing Agency: CARDNE

Project Coordinator: Dr. Sireen Naoum

Project Team: Dr. Salam Ayoub, Eng. Mai Diab, Eng. Loui Daoud and Eng. Abdallah Daoud

The specific objectives are:

  1. To explore the potential for improvements in water use efficiency and the impacts of deficit irrigation and regulated deficit irrigation treatments on olive cultivation.
  2. To describe the relationship between revenue return and applied water using crop water requirements and sustained deficit irrigation by testing deficit irrigation strategies on oil production and quality.

III. To optimize irrigation scheduling and levels for important varieties of olives according to stages of tree growth and fruit development and by using automated sensing of tree water status.

  1. To develop and implement technology transfer strategies so that information on regulated deficit irrigation reaches farm advisors, consultants and growers

A selected farm is located at Mugheir Alsarhan village in Mafraq governorate. The experiment is conducted on two olive cultivars; Nabali Muhasan and Nabali Baladi. Six irrigation treatments were applied Table 1. Trees are 16 years old. The cultivars are planted in separate adjacent plots. Sub-plots of 12 trees (3 rows X 4 trees) for each treatment replicate were identified and labeled. Two inner trees in the center row were selected and labeled for sampling and measurement of shoot growth, trunk circumference and fruit set. ET rate was estimated according to Class A pan evaporation data Irrigation started on April. Different treatment was applied on “On” year and Off” year production.

Table.1. Treatments applied for Jordan.

T1 80% Etc* full season
T2 80% ETc, from 1 September – according to fruit water content (FWC)**
T3 80% ETc until June 1. 50% ETc until August 1, 80% until October 1, according to FWC
T4 ON year: 80% ETc until June 1. 50% ETc until August 1, 80% until October 1,

OFF year: 80% ETc until July 1, 50% until September 1

T5 ON year: 40% until August 1, 80% until October 1, according to FWC.

OFF year: 60% ETc until July 1, 40% until September 1, according to FWC

T6 Using stem water potential (SWP) : ON year: Minimum SWP*** -15 until June 1, min SWP -30 until  August 1, min SWP -25 until October 1,

OFF year: Minimum SWP -25 until July 1, min SWP -35 until September 1,

*ETc Crop calculated evapotranspiration;

**FWC fruit water content and ***SWP stem water content

  • Taking samples of the fruits of two trees from the trees designated for research, for each repeat.
  • Taking plant, fruit, soil and irrigation water samples during the project period.

Results:

The results of the second season of 2018 showed that there were no significant differences in the readings of the stem diameter and the vegetative growth between the six parameters for the two varieties Nabali Baladi and Nabali Al-Mohsen.

There are no significant differences with regard to production and fruit weight for the cultivar Nabali Baladi, while there are significant differences for the improved Nabali variety.

The quality of the oil was within the standard of virgin olive oil for all treatments and seasons, where the percentage of acidity and the peroxide value did not exceed the permissible value of 3.3, 20


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