Tillage intensity causes the soil and aggregates structure stability to change. For the purpose of achieving a better management in soil tillage practices, a reduction of potential damages of agricultural machinery traffic and ultimately an increase in productivity regarding different aspects of soil protection in order to obtain a stable soil aggregates conditions; in this study, an experiment was conducted in potato production farms located in north of Khuzestan province with silt clay loamy soil using a randomized complete block design in spilt-split plot arrangement with three replicates during 2012-2013 growing year. Main plots were soil moisture with three levels (10, 15 and 20%) and subplots were tillage intensities using cyclo-tiller in three vertical rotary speeds of blade (150, 200 and 250 rpm) and the number of agricultural machinery passes after plowing through the target growing year with three levels (including once, three and five times of passes) were considered as sub-sub plots. Modeling of BD, CI, MWD and GMD with potato yield using multiple linear regression model indicated that all three variables in the model as explanatory variables justifying the soil compaction and yield reduction, were successful at explaining more than 80% of the variances, and traffic was detected as the most important factor in soil compaction and potato yields reductions. As a result of employing binary genetic algorithm approach for optimization of potato yield, the optimum soil moisture in time of planting was calculated to be 20%, the optimum vertical rotary speed of blades was 150 rpm and the optimal number of passes was one pass through the total area of farm land. Thus, based on the obtained optimal variable values, the least amount of harvestable potato was estimated to be 27 tons.
