Asian Journal of Plant Sciences1682-39741812-5697Asian Network for Scientific Information10.3923/ajps.2008.79.84Ali ShamsabadiHossein 1200871To study the effects of four types of primary tillage implements
separately and seed densities on the yield of rain fed wheat using deep
drill planting with press wheel and drill planting with end wheels, an
experiment was conducted in research farm of Gonbad Agricultural faculty
during 3 years (1997-2000), split block factorial design with three replications
was used as experimental design. The primary tillage implements included:
Moldboard Plow (MP), Disc Plow (DP), Chisel Plow (CP) and Offset Disc
(OD). TAJEN wheat cultivar was planted at the rates of 140, 150 and 160
kg ha-1. Crop yields for different treatments were measured
at the end of the study. The results showed that grain yield was not affected
by seed density and types of tillage machines. But year, replicationxyear,
planting machine and interaction effect of yearxplanting machine had significant
effects on the grain yield (p<1%). As a result, considering the priority
of soil physical properties, reduced tillage could be recommended as a
promising strategy to improve soil physical quality, preventing soil erosion
and to ensure moisture control, less energy consumption and fast preparation
of soil as well as reducing costs of production, using of Chisel Plow
with 140 or 150 kg ha-1 seed density with deep drill planting
machine is suggested to increase wheat yield.]]>Afuni, M.M.R. and Mosadeghi,200153955Amin, H.,19981998Arnon, I.,19721972Baloch, J., A.N. Mirani and S. Bukhari,1991223438Carr, P.M., R.D. Horsley and W.W. Poland,200343210218Ciha, A.J.,198274317320Cox, D.J., J.K. Larsen and L.J. Brun,198678795801Donaldson, E., W.F. Schillinger and S.M. Dofing,200141100106French, R.J. and J.E. Schultz,198435743765Garcia del Moral, L.F., Y. Rharrabti, D. Villegas and C. Royo,200395266274Guberac, V., J. Martincic, S. Maric, M. Jurisic and V. Rozman,200028307314Hargrave, W.L., J.T. Reid, J.T. Touchton and R.N. Gallaher,198274684687Hemat, A. and A. Asadi,1997281933Hodgson, D.R., N.A. Kipps and M.A. Braim,19895189194Iqbal, M., M.S. Sabir, M. Younis and A.H. Azhar,1994251316Khajepoor, M.R.,19861986Mahboubi, A.A., R. Lal and N.R. Favsey,199357506512Paulsen, G.M.,19871987pp: 384-389pp: 384-389Peltonensainio, P. and P. Jarvinen,1995404956Saif, H.,19761976Schillinger, W.F. and D.L. Young,20049611821187Schillinger, W., D. Wellsandt, H. Schafer, S. Schofstoll and R. Papendick,20052005Shafieei, A.,19921140141Shah, S.A., S.A. Harrison, D.J. Boquet, P.D. Colyer and S.H. Moore,19943412981303Stougaard, R.N. and Q.W. Xue,2004Avena fatua) interference.]]>52133141Tanaka, D.L.,19895315061511Touchton, J.T. and J.W. Johnson,1982745759