Abstract
A field study was conducted at Al-Mahalabia to study the effect of two plowing depths (15-20) cm, (20-25) cm and three plowing speeds (2.57, 3.31 and 5.63) km/hr by using the moldboard plow in the yield of barley crop (spikes number in the meter square, spike length, number of grains per spike, weight of grains per spike and grain yield) and some field performance criteria (practical speed, slippage percentage and practical productivity), Results showed that the effect of interaction between depths and speeds of plowing were significant in weight of grains per spike and grain yield while there were no significant differences concerning other studied characteristics.
