The aim of this study was to compare tillage methods and plant density on yield and yield components of soybean [Glycine max (L.) Merrill] grown under main and double cropping systems. The field experiments were carried out at the experimental area of Agricultural Faculty, Dicle University during 2013 and 2014. The experiments were conducted as split-split plot design based on randomized complete blocks with two sowing dates (normal and late) as the main plot, three tillage methods (no-tillage, reduced and conventional) as sub-plot, and three between row spacing (35, 55 and 70 cm) sub-sub plot factor. The experiments were performed in three replications and soybean cultivar Nova (MG III) was used. The combined analysis of the data showed that yield means of reduced tillage (2015.4 kg/ha) and conventional tillage (2036.1 kg ha-1 ) were significantly different (P>0.01) compared with no-tillage (1881.1 kg/ha). Significant interaction was observed.
among experimental factors. The highest value was obtained at early sowing x conventional tillage x 70×5 cm as of 2206.1 kg ha-1