The Effect of Adding Different Levels of Olive Mill Waste Water on Moisture Tensile Curves and Some Quantitative, Qualitative Characteristics of Potato Tubers In Heavy Clay Soil

Shaza Asaad* (1)

(1). Department of Agricultural Mechanization, Faculty of Technical Engineering, Tartous University, Syria

(*Corresponding author: Dr. Shaza Asaad. E.mail:

Received: 19/11/2021         Accepted: 4/02/2022 


The experiment was conducted in the Agricultural Research center in Tartous on potato”Spunta” in spring  during(2014-2015) to investigate the effect of olive mill waste water (OMWW) was added in different levels of field capacity on the moisture tensile curves and on some quantitative, qualitative characteristics of potato tubers in heavy clay soil. The experiment included 6 treatments as control (without OMWW), and five rates of OMWW (12.5,25,50,75,100%) of field capacity. Plots were completely randomized over the experimental area with three replicates for each treatment. Each replicate contained/ 40/ plants. Results showed that the soil moisture content decreased when the pulling moisture increased. And when we increasing the addition rates of olive mill wastewater,th e soil moisture content at the same pulling moisture increased. Treatment M4 gave a moisture content (50%) at depth (0-20 cm)and at moisture tensile(1.93), while the moisture content was (45%) of the treatment M2  and at the same moisture tensile. Treatment M2 gave a moisture content (47%) at depth (20-40 cm)and at moia sture tensile(2.10), while the moisture content was(50%) at treatment M5 and at the same moisture tensile. The results showed as well, that different levels of adding  olive mill waste water increased  growth   ,  yield and specific characteristics  of potato  tuber( percentage of dry matter, starch and protein)     compared to the  control. M4 treatment gave the highest value of plant height (36cm), unit yield area (3047.25 kg/ donom) compared to control. While M2 increased significantly and gave the highest value of percentage of dry matter(20.66%), starch (14.35%) and protein(7.5%) compared to  control. where the correlation relationship between level  adding of olive mill waste water and potato production showed that the best level of addition is 55% of field capacity , Where the production was increased about 31.06% comparison with  the control, and this increase is not different significantly from the addition 18% , so we can simply add olive mill waste water by 18% of field capacity for this type of soils.

Key word: Olive mill waste water, moisture tensile curves, quantitative and qualitative characteristics of tuber. 

Full paper in Arabic: pdf