الفهرس 
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Abstract
The aim of this study was to design, manufacture and evaluate amounted combine machine for cutting and shredding cotton stalks. It consists of main frame, cutting-feeding section, shredding section and transmission system to transmit the rotating motion from tractor PTO to the movable component. The practical experiments were divided into two groups. The first one is the preliminary experiments to choose the proper kinematic parameter between speeds of rotating parts and machine forward speeds. The second one is the main experiments that conducted to evaluate the designed machine under four different stalks moisture contents (w.b.) of (37.83, 33.54, 28.87 and 20.17%), four different clearances between cutting drums of (1, 2, 3 and 4 cm), four different peripheral speeds of shredder of (47.1, 54.95, 62.8 and 70.65 m/s) and different numbers of plan blades on shredder of (2, 4, 6 and 8 blades). All variables were carried out at four different kinematic parameters of (7.83, 10.46, 13.48 and 17.21) between cutting rotating speed of 1000 rpm and four forward speeds of (2.75, 3.5, 4.5 and 6 km/h). Shaving machine performance was evaluated in terms of field capacity, cutting and shredding efficiency, energy requirements and shaving cost. The experimental results revealed that 28.87%, 2cm, 62.8m/s, 6 blades and 10.46 of stalks moisture content, cutting drums clearance, shredder peripheral speed, number of plan blades on shredder and kinematic parameter, respectively recorded minimum total cost of 135.35 L.E/fed and minimum specific energy requirement of 56.kW.h/fed at actual field capacity of 0.6fed/h, field efficiency of 92.54%, cutting efficiency and shredding efficiency of 93.87 and 57.26% respectively.