01474naa a2200169 a 450000100080000000500110000800800410001910000180006024501500007826000090022852009070023765000260114465000170117065000210118765300370120877300590124512800902025-07-28       1987    bl uuuu     u00u1 u    #d1 aPALMER, J. P.  aThe effect of nitrogen level and time of sowing on the establishment of white clover (Trifolium repens) on colliery spoil.h[electronic resource]  c1987  aMethods ofestablishing white clover (Trifolium repens) on colliery spoil were investigated in a 2-year greenhouse experiment by varying nitrogen,fertiliser levels and clover sowing times with respect to those ofcompanion Lolium perenne. Clover established best at the lowest nitrogen levels when sown with the grass. When sown into established grass swurds, best clover growth occurred after the spoil nitrogen supply had become depleted. As minerulisuble nitrogen levels in the spoil fell, white clover became dominant, even in swurds where it had initially established poorly. In the second growing season, herbuge yield was equivalent to 1320 g DM m -2, of which 90% was white clover. Minerulisuble nitrogen levels were still very low. It is suggested that this is because most of the nitrogenjixed (estimated at &gt 40 g N m-=) was utilised by the clover in shoot growth and was removed at harvests  aConservação do Solo  aTrevo Branco  aTrifolium Repens  aRecuperação de área degradada  tLandscape and Urban Planninggv. 14, p. 369-378, 1987.