III. An improved chisel coulter with trash handling and fertiliser placement capabilities

摘要

Abstract A redeveloped direct drilling chisel coulter is described. The new version has retained the agronomically desirable features displayed by its original experimental counterpart, particularly when operating in dry soil or climatic conditions. In addition the new coulter has much better trash handling ability, separate seed and fertiliser placement, covering and depth control, wear characteristics, and maintenance. The device also operates well in cultivated soil and gives the impression that in these conditions, seed placement is little different from that commonly attributed to precision unit drills, particularly for depth control and the press wheel covering action/and soil-seed contact. Simultaneous band or blanket spraying are now more simple possibilities, as nozzles can be mounted immediately behind the press wheels. Draft requirements have been increased substantially compared with triple disc coulter assemblies and the original experimental chisel coulter assembly, and there is some doubt a...