Two filed experiments were conducted during 1998/99 and 1999/2000 seasons at the Agricultural Research and Experiment Center of the Faculty of Agricultural Moshtohor to study the effect of different tillage systems including chisel plowing, moldboard plowing at two depths (18-20 and 28-30crn) as well as no-till and N fertilization levels (zero, 30, 60, 90, 120 kg/fed.) on yield and its components of wheat, associated weeds, some soil properties as well as economic evaluation of the studied treatments. Results revealed that moldboard plowing at 28-30cm showed the lowest value of bulk density whereas, soil porosity percentage increased at both depths for moldboarding. Also, at the same depth, weed infestation was reduced. Increasing nitrogen level significantly reduced weed infestation at 45 days from planting and at harvest. The highest values of grain and straw yields of wheat and its attributes (number of tillers/m3, 1000-grain weight, and spike weight)wcre recorded when using moldboard plowing at both depths. Incrcaing nitrogen rates significantly increased grain and straw yield and yield components of wheat. The maximum grain yield was recorded by applying nitrogen rate of 120kg/fed. The interaction including moldboard plowing at 28-30cm with applying 120kgN/fed.was the best in depressing weed. The maximum net return was recorded by moldboarding (28-30cm) combined with applying 12QkgN/fed. in both seasons. |
