Influence Of Shallow Tines On Draft Requirement Of Subsoiler And Soil Physical Conditions
2007
Gazor, H.R., Assist. Prof. Agricultural Engineering Research Institute.Karaj. Iran., | Loghavi, M., Associate, Prof. department of Farm Power and Machinary, College of Agriculture, Shiraz, University.
Soil compaction is a serious problem in agricultural fields and has negative effects on suitable physical conditions. Depending on the soil physical condition and special geometrical shape of these implements, soil can move upwards and forwards up to a specified depth and then soil moves to sideways at lower depth. This depth is called critical depth. The present study was conducted to investigate the effects of these shallow tines at three tine spacing (50, 75 and 100cm) and operating at 25 cm depth, on draft and soil physical condition in a clay loam soil in the Badjgah region of Shiraz in comparison with a conventional subsoiler operating at 50 cm depth. Analysis of the results indicated that use of shallow tines in front of the main shank had positive effects on draft and soil physical conditions. Using these tines at 50 and 75 cm spacing reduced implement draft and increased soil disturbance significantly as compared with the subsoiler shank alone. It was also concluded that when the tines were spaced at 50 cm and 75 cm, the soil cone index had significant reduction in 30 â€' 40 cm depth and increased critical depth.
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