Investigations into nitrogen sources and supply in reclaimed colliery spoil |
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| Authors: | J P Palmer P J Williams M J Chadwick A L Morgan C O Elias |
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| Institution: | (1) Derelict Land Reclamation Research Unit, Department of Biology, University of York, YO1 5DD York, UK;(2) Present address: Department of Botany and Microbiology, University College of Wales, SY23 3DA Aberystwyth, Wales;(3) Present address: Department of Biology, College of Ripon and York St. John, Lord Mayor's Walk, YO3 7EX York, UK;(4) Present address: 37 Siward St., YO1 3LW York, UK;(5) Present address: 7 Silver St., YO4 6PA Riccall, UK |
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| Abstract: | Summary Two trials were established to investigate the supply of nitrogen from ammonium and nitrate fertilizers, slow release nitrogen fertilizers, an organic nitrogen fertilizer and a legume, at two phosphate levels, to eight grass cultivars on colliery spoil. Spoil nitrogen supply and chemical characteristics and herbage dry matter and nitrogen yields were monitored for up to seven years. pH and conductivity fell at both sites. pH trends appeared to be independent of nitrogen treatment. Nitrogen in the ammonium form gave better yields than in the nitrate form when 125 kg N ha–1 was supplied in a season but there was no difference when 62.5 kg N ha–1 was applied. Slow release forms of nitrogen gave better yields more evenly distributed over the season than one application of ammonium sulphate per season. Once established white clover (Trifolium repens) plots had a more consistent nitrogen supply, more evenly distributed yield and better quality herbage than nitrogen fertilizer plots.Lolium perenne yielded poorly at low fertility.Festuca rubra andAgrostis castellana, although establishing slowly, yielded well under high and low fertility. |
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| Keywords: | Colliery spoil Grass cultivar Legumes Nitrogen sources Nitrogen supply Phosphate level pH Reclamation |
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