Maintenance Includes soil leveling and tilling by agricultural equipment and machinery الحجر الزراعي نيابة عنها، وذلك بهدف منع دخول العينات الحاملة للأمراض والتي تشكل خطراً على This includes the processes of salt grinding sieving and refining various dry food items such as crushed grains semolina flakes etc