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Field experiments were conducted to find the optimum spacing's within two bent leg plows mounted on a tool-bar and between two sets of plows in subsequent trips. The optimum spacing's would result in improved soil physical conditions at comparatively lower energy demand. The plows were operated on a clay-loam soil at 15% moisture content, db. at tractor forward speed of 3.5 kmh-1. A split-plot design with three replications was considered for the study. Three plowing depths (25, 35 and 45cm )and four interrow spacing's
(95, 115, 135 and 155 cm)were considered as the main and sub-treatment in
the study, respectively. The spacing's between two subsequent rows were held at half of the corresponding interrow spacing's. In each experiment the draft torce and changes in the soil physical conditions were measured. The analysis of the data revealed the significant increasing effects of plowing depth and spacing on the draft requirement. The power required by the plows for the
within the rows spacing range of 95-155cm and the depth range of 25-45 em was in the range of 16.5- 23.5 kw. The cumulative infiltration over 45 min. for
the interrow spacing's and the between row spacings increased up to 2.8 and 1.8 times that of before tillage conditions, respectively. Sharp decrease in soil cone index compared with before tillage conditions were noticed for both spacings. Two multiple regressions were performed to correlate the measured parameters and the spacing's. The equations suggest that the optimum interrow spacing and spacing between two subsequent trips are 122 and 47.5
cm, respectively. Observing the recommended spacing's would result in better
soil tillage and higher field efficiency at comparatively lower cost and therefore should benefit the farmers.