This study was carried out in one of compost factories in Sadat city Menoufia, Governorate in 2011. Basically these studies aimed to identify engineering studies on agricultural residuals recycling. These agricultural residuals are: Fields wastes (shredded rice straw), Animals wastes (manure) and Food processing wastes, sugar cane factories wastes (press-mud). The composting was aerobic; the mechanical turning was done by turning machine which traced with tractor by the rear shaft PTO. Then temperature, moisture content, reducing ratio, composting period and final product were measured. From results found, the temperature reaches its maximum quickly when piles turning three times per week for all piles, the moisture content decrease with increasing the composting period and frequently turning, the reducing ratio decrease with decrease the composting period, the higher product was at the higher frequently turning and the composting period was decrease with increasing the frequently turning.