ABSTRACT This study was carried out to evaluate a hydraulic machine for briquetting peanut husks to overcome the separation of the residues after the addition in the soil and through the briquetting operation to increase the machine productivity. The effect of grinded peanut husk group size ranged from (2-5) to (7-10) mm size, raw materials moisture content 9.81, 13.25 and 16.22 % (w.b.), hydraulic pressing at four different levels of applied pressure (50, 100, 150 and 200 bar) and exposure times of (5, 10, 15 and 20 min) on machine productivity, energy consumed and briquetting cost. Also, tested parameters on briquetting qualities such as durability, stiffness, briquettes bulk density and briquettes water holding capacity. The results showed that, the optimum operating conditions of the briquetting machine was at raw materials moisture content of 9.81% (w.b.), hydraulic pressing pressure of 200 bar and exposure time of 20 min. It gave machine productivity of 3.32 and 3.39 Mg/h, energy consumed of 13.00 and 13.10 kW.h/Mg and operating cost of 123.00 and 120.00 LE/Mg for grinded briquetting sizes from (2- 5) to (7-10) mm, respectively. Moreover, the optimum operating conditions gave the best briquettes quality as well as, compression ratio of about 6.54 and 10.12, water holding capacity of 5.55 and 3.89 and shattered index of 93.3 and 91.6 for grinded briquetting sizes from (2- 5) to (7-10) mm, respectively. The results of the study revealed that the use of briquetting machine with peanut husk residues leads to improvement of the product properties and raise its benefit as soil conditioner.