Corn (Zea mays L.) is the most important grain-forage
crop in Iran. The average grain yield of corn is more than
8 t/ha and it increases annually. In order to optimize the
use of moisture, nutrients and solar radiation, corn seeds
must be planted under optimum density and tillage
system. Intensive production of field crops practiced until
recently to achieve high yields, required intensive tillage
and application of other high-technology inputs. This
concept, however, implies a number of problems, among
which relationship between product quality and quantity
are in the foreground, along with increased crop
production which shows an important ecological
sustainability. Above all, farmers approach production in
terms of the cost effectiveness of the applied system
(Kisic et al., 2010).