Abstract
ABSTRACT THE basic problem associated with no-till and minimum tillage planting is the seed placement under the crop residue. Three common size plain disc coulters were evaluated in a soil bin for their crop residue cutting ability as influenced by soil resistance and straw density. Draft and vertical forces on coulters were measured for tests with and without straw cover. Observations and analysis of data indicated a varying degree of crop residue being cut by the coulters. The 460 mm diameter coulter was able to cut nearly 100% of the straw under various test conditions, while 360 mm and 600 mm diameter coulters were not as effective.
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