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Abstract The main objectives of this study are: 1- Cutting some crop residues into pieces (rice straw, corn stalks and sugar cane residues) in order to minimize their size and volume to facilitate, handling, transporting and storing. 2- Optimizing some operating parameters (chopper rotating speed, material feed rate and residues moisture content) affecting the performance of crop residues chopping machine. 3- Adding chopped crop residues to soil and study their effect on some soil physical properties and wheat yield |