Abstract
This study was carried out at two sites of different texture which was clay and a clay loam in Mosul - Al-Rasheedia. and located at what is considered to be a semi water fall guaranteed arable area .A plough of three different shank shapes have been used . These shapes were vertical, inclined forward and curved with two plough depth of 8-12 cms and 13-17 cms successively with three speeds 3.70 ., 7.15 and 9.64 Km/hour. To study the effect of the shank shape on the some physical properties of soil (moisture content, bulkdnsity, porosity, penetration resistence and mean weight diameter) the two experimental farms have been designed by the use of complete randomize design which was used with three factors and replications. The main results of this study are: The curved shank outperformed at the first site and at the three dates in recording the lowest bulk density, highest porosity and the lowest penetration resistance for the two dates at the first site and by the use of the means of the two sites. The 8-12 cm depth outperformed at the two sites with their means in recording the lowest bulk density and highest porosity .The (7.15) Km/ hour speed recorded the lowest bulk density and highest porosity at the beginning , middle and the end of the season. The vertical shank at depth of (13-17) cm and at speed of (9.64) Km/hour gave the highest moisture content at the first site at the end of the season. The inclined forward shank outperformed at the depth of (13-17) cm with speed of (7.15) Km/hour at the second site giving the lowest bulk density and highest porosity at the end of the season.
