Theoretical analysis of interaction of disc coulters and straw residues under no-tillage conditions
¹Institute of Agricultural Engineering and Safety, Aleksandras StulginskisUniversity, Studentu 15A, LT-53361 Akademija, Kauno distr., Lithuania;
²Institute of Agroecosystems and Soil Science, Aleksandras StulginskisUniversity, Studentu 11, LT-53361 Akademija, Kauno distr., Lithuania;
³Department of Agricultural Machinery, Faculty of Agriculture, AkdenizUniversity, TR-07058 Antalya, Turkey
The article presents the theoretical aspects of disc coulters working process under no-tillage conditions. Under no-tillage conditions, effective operation of disc coulters is impededby plant residues. In the interaction of a disc coulter, plant residues and soil surface, the disccoulter may cut the plant residues, roll over them or press them into the furrow being formed inthe soil. The objective of the research is to theoretically study the process of straw cutting bydisc coulters under no-tillage conditions and to substantiate the main parameters acting upon thecutting force. Theoretical studies established the dependency according to each the extent of thestraw cutting force depends on the disc coulter blade sharpening angle, blade thickness and disccoulter blade length, straw normal stresses, friction coefficient, elastic modulus, straw diameter,its compression path, and other parameters. On the basis of calculations, it was found that if thedisc coulter blade sharpening angle is increased by one degree, the cutting force sufficient to cutwheat straw can be reduced by 6.5 N, and reducing the disc coulter blade thickness by onemillimetre would allow reducing the cutting force by 12.5 N.