effects of four primary tillage machines on some properties of potato tubers

effects of four primary tillage machines on some properties of potato tubers     m .a ghazavi1, r . a mahmoodieh1* and a. khoddami2   1-assistant professor of agricultural machinery , islamic azad university, khorasgan branch, isfahan, iran.   2- technical assistant of food science and technology, islamic azad university, khorasgan branch, isfahan, iran.     received: accepted:     abstract   with regard to the importance of potato production and effective parameters on qualitative properties, series of experiments were conducted in the research fields of islamic azad university, khorasgan branch. a randomized complete block design with four treatments (moldboard plow, chisel plow, disk plow and improved disk plow) in three replications was used and treatments were compared. results of analysis of variance showed that the effect of tillage machine on moisture content, dry matter, density, different sugars, ph and organic acids were not significant at 5% level. all of the measured parameters were in the acceptable range. according to the results of duncan′s multiple range tests , improved disk plow was better than mold board plow in some variables. thus, it can be concluded that improved disk plow would be a good alternative tool for moldboard plow especially in potato production.     keywords : tillage, potato, qualitative properties, improved disk plow                             *corresponding author email : [email protected]