Matouk,, A., El-Kholy, M., Tharwat, A., El-Menshawy, M. (2012). PHYSICAL AND MECHANICAL PROPERTIES OF JOJOBA SEEDS. Journal of Soil Sciences and Agricultural Engineering, 3(5), 575-586. doi: 10.21608/jssae.2012.54334
A. M. Matouk,; M. M. El-Kholy; A. Tharwat; M. E. El-Menshawy. "PHYSICAL AND MECHANICAL PROPERTIES OF JOJOBA SEEDS". Journal of Soil Sciences and Agricultural Engineering, 3, 5, 2012, 575-586. doi: 10.21608/jssae.2012.54334
Matouk,, A., El-Kholy, M., Tharwat, A., El-Menshawy, M. (2012). 'PHYSICAL AND MECHANICAL PROPERTIES OF JOJOBA SEEDS', Journal of Soil Sciences and Agricultural Engineering, 3(5), pp. 575-586. doi: 10.21608/jssae.2012.54334
Matouk,, A., El-Kholy, M., Tharwat, A., El-Menshawy, M. PHYSICAL AND MECHANICAL PROPERTIES OF JOJOBA SEEDS. Journal of Soil Sciences and Agricultural Engineering, 2012; 3(5): 575-586. doi: 10.21608/jssae.2012.54334
PHYSICAL AND MECHANICAL PROPERTIES OF JOJOBA SEEDS
1Agric. Eng., Dept. Fac. of Agric. Mansoura Univ., Egypt.
2Handling and processing of Agric. Crops Dept. Agric. Eng. Res. Institute.
Abstract
A study was carried out to measure some of the most important physical and mechanical properties of freshly harvested jojoba seeds at initial moisture content of about 7 % ±1 (d.b).The studied physical properties included principal dimensions of jojoba seeds (length, width and thickness), geometric diameter, arithmetic diameter, shape index, seed volume, frontal area, arithmetic cross sectional area, surface area, surrounded surface area, sphericity, mass of 100 seeds, porosity, real density and bulk density (at loose and vibrated fill) . While the mechanical properties included, repose angle, seed hardness, shear force, crushing force and porosity of seeds. The obtained results showed that, the principal dimensions of jojoba seeds including length, width and thickness recorded values of (16.95, 13.13 and 11.78 mm) respectively. It was also recorded a volume of 1374.62 mm3, geometric diameter of 13.74 mm, arithmetic diameter of 13.95 mm, frontal area of 174.80 mm2 and a sphericity of 81.19 % . The real density of jojoba seeds was 976.86 kg/m3. While, the bulk density recorded value of 602.10 and 630.33 kg/m3 under loosely and vibrated fill conditions respectively. The repose angle of jojoba seeds recorded a value of 29o, seed hardness of 153.19 N, shear force of 111.78 N at the longitudinal axis and 207.45 N at the transverse axis. The crushing forces of seeds were 302.95 and 295.25 N at the longitudinal and the transverse axis respectively. While, the recorded average of porosity was about 44.88 %. Mass of hundred seeds ranged from (99.15 to 109.20 g) with on average of 103.79 g.
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