00455naa a2200145 a 450000100080000000500110000800800410001910000200006024501090008026000090018970000190019870000160021770000150023377300610024818379572010-01-10       1986    bl ---       0--  u    #d1 aCAMPBELL, D. J.  aControlled seedbed traffic after ploughing or direct drilling under winter barley in scotland 1980-1984.  c19861 aDICKSON, J. W.1 aBALL, B. C.1 aHUNTER, R.  tSoil & Tillage Research, Amsterdamgv. 8, p. 3-28, 1986.