1. The requirements of dry fertilizer placement in direct drilled crops by an improved chisel coulter;Afzal,1981
2. The mechanized collection of turf blocks and their utilization in field experimentation;Baker,1972
3. Experiments relating to the techniques of direct drilling of seeds into untilled dead turf;Baker;J. Agric. Eng. Res.,1976
4. Some thoughts on fertilizer placement in direct drilling;Baker,1981
5. Developments with seed drill coulters for direct drilling: 3. An improved chisel coulter with trash handling and fertilizer placement capabilities;Baker;N.Z. J. Exp. Agric.,1979