Effect of mechanical chopping and adding different farm residues on soil physical properties and wheat yield

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