Optimization Experiment on Assembly Multi-finger Intra-row Weeding Mechanism（Extracts）

Performance of three tillage discs，namely standard，notched and spiral notched was evaluated in an indoor soil bin with sandy loam soil.The laboratory testing setup consisted of soil bin system and data acquisition system.Double extended octagonal ring（DEOR）transducer and torque transducer with slip rings were used for three dimensional forces and torque measurements.Three disc angles and three disc rotational speeds were considered for the study.For all the disc shapes considered，driving disc by an external power found reducing the resultant soil forces acting on the tillage disc.Different patterns of cutting edge of the tillage discs significantly affected the forces exerted on tillage disc and soil cutting action.Spiral notched disc exhibited lower values of soil reactions than notched and standard discs.The spiral cutting edge offered shear cutting action eliminating shock loads，hence providing smooth operation.Consequently，the spiral notched disc is recommended for its potential use in conservation tillage practice for efficient crop residue cutting.