Is the potato crop vegetables Home in Egypt, which is cultivated annually in the lugs of the three (Winter ,Nile and Summer) total area within the limits of 450 thousand acres and estimated the haulm of potatoes for the area cultivated about 1,575 million tons with an average of about 3.5 tons per acre of haulm potato. Field crop residues have become a heavy problem of the Egyptian farmer. To get rid of this trouble, being resorted out burned in the open field. Where as some farmers use these as heels, as rich get fern it a media for spreading diseases. That causes environmental disaster and dangerous healthy problem. Potatoes haulm around 8 – 9 % of the total residues (18-25 million tons annually). The trails are conducted at Gemmza Research Station, ARC under the four levels of drum speed (1000, 1200, 1400, and 1600 rpm), & (48 and 68) number of knives and three feeding rates (600, 800, and 1000 kg/h), to measure the mean weight length, fuel consumption, power consumed, energy-consuming and machine performance efficiency. The mean length cut weight between (6.608 and 10.627 mm) resulted This objective of this research is to identify the appropriate mean weight lengths suitable to submission to the different animals, either small animals such as rabbits, medium animal such as goats, sheep or large animals such as cows and buffaloes.