Evaluation And Comparison Of Two New Combined Plows With Conventional Plow
2005
Javadi, Arzhang | Mohammadi Gol, Reza | Shafi`i, Parvin | Sulati, Mehdi | Qazavi, Mohammad A`li
Conventional tillage operations by using moldboard plow and disk plow need to be changed or improved .Two combined plows were recently developed to modify the conventional equipment as well as increasing efficiency.The aim of this research was to investigate performance of two combined plows compared to conventional plow.The experiments were conducted in a loamy soil texture with soil moisture content of 16-18% in Karaj region .Data was statistically analyzed using RCBD in three replications. Draft resistance,specific draft,cone index,bulk density,MWD and residue reversing were measured or calculated and then analyzed. The results indicated that bulk density decreased %30.8 by moldboard + chisel plow particularly at depth range of 25-35cm. The results of penetration resistance(CI) confirmed the effect of this treatment on plowpan. Hence this combined machine can be recommended for a field with plowpan. Moreover diskplow + chisel treatment created the least clod (MWD) in shallow soil layer. Therefore this combined machine can be recommend for reducing secondary tillage operation. The draft resistance was increased %17 with moldboard + chisel and decreased %9 with disk plow + chisel compared to conventional moldboard plow. However specific draft was decreased %17.7 and %10 for both combined plows respectively compared with conventional plow.The results of residue reversing noted that disk plow+chisel treatment left maximum of %68 crop residue. It can be therefore mentioned that for conservation tillage system with residue reversing concern this combined machine whould be substituted.
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