Journal of Agricultural Technology 2012, Vol. 8(5): 1571-1579 1571 Prediction of cucumber mass by geometrical attributes Rashid Gholami * , Ali Nejat Lorestani and Farzad Jalilian Tabar Mechanics of Agricultural Machinery Department, Faculty of Agriculture, Razi University, Kermanshah, I.R. Iran Rashid Gholami, Ali Nejat Lorestani and Farzad Jalilian Tabar (2012) Prediction of cucumber mass by geometrical attributes. Journal of Agricultural Technology 8(5): 1571-1579. Knowing physical characteristics, such as, dimensions, mass, volume and projected areas and relationship among them, are important in harvest and post harvest technology. It is necessary to know relationships between mass and size of Cucumber fruit in order to design and develop of planting, harvesting, grading and handling equipments. Therefore, an awareness of grading fruit based on weight is important. In this research was aimed to present some physical properties of Cucumber fruits. The mass of Cucumber was predicted with using different physical characteristics in four models include: Linear, Quadratic, S-curve, and Power. The results shown that, all properties considered in the current study were found to be statistically significant at the 1% probability level, and the models for prediction the mass of Cucumber were based on medium projected area, small diameter, surface area, geometric mean diameter, arithmetic mean diameter, criteria area and volume of the Cucumber with determination coefficients of 0.991, 0.94, 0.997, 0.965, 0.954, 0.973 and 0.9994 respectively. At last, mass model based on medium projected area from economical standpoint is recommended. Key words: Cucumber, mass modeling, geometrical attributes, physical characteristics Nomenclature m mass(g) P A small projected area(mm 2 ) a big diameters(mm) b medium diameter(mm) P B medium projected area(mm 2 ) P C big projected area(mm 2 ) c small diameter(mm) D g geometric mean diameter(mm) D a arithmetic men diameter(mm) CPA criteria area(mm 2 ) V volume(ml) b 0 ,b 1 ,b 2 curve fitting parameters X independent parameter Introduction The cucumber (Cucumus sativus) is a warm-season vining crop in the Cucurbit family. Cucumbers suitable for immediate consumption are referred to as “slicers,” while those for processing are picklers. All cucumbers grown commercially in the state are now for fresh market consumption. Cucumber * Corresponding author: Rashid Gholami; e-mail: rashidgholami@gmail.com Journal of Agricultural Technology 2012 Vol. 8(5): 1571-1579 Available online http://www.ijat-aatsea.com ISSN 1686-9141