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Revista de Ciências Agrárias

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BRITO, Luis Miguel; FERNANDES, António; AMARO, Ana Luísa  and  MOURAO, Isabel. Organic and inorganic nitrogen recovery by white cabbage (Brassica oleracea var. capitata). Rev. de Ciências Agrárias [online]. 2011, vol.34, n.2, pp.94-105. ISSN 0871-018X.

The response of white cabbage to increasing rates of a mineral fertilizer (0, 90 and 180 kg ha-1 of mineral nitrogen) combined with increasing rates (0, 20 and 40 t ha-1) of an organic fertilizer resulting from the composting process (182 days) of the solid fraction of dairy cattle slurry, was assessed throughout a systematically arranged experiment to investigate the effect of this compost on cabbage growth and N uptake, with and without mineral N application. Cabbage yield was strongly related to mineral N application and to compost application in treatments without mineral N fertilizer. The increase on mineral N application from 90 to 180 kg ha-1 increased cabbage N uptake but not significantly cabbage yield. The application of this compost to cabbage crop is recommended up to 20 t ha-1, particularly when mineral N is not applied.

Keywords : mmonium nitrate; compost; slurry solid fraction.

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