419 - MANAGEMENT SYSTEMS TO REDUCE IMPACT OF NITRATES

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J. C. Germon, ‎S. Dupain - 1989 - ‎Vista de excertos

Engs. E.M. Sequeira and M.V. Gama for their constructive suggestions for this paper. They also thank Agric. ... metodo de Egrier-Riehm na determinaca'o do fosforo e do potassio "assimilaveis" em solos de Portugal. Revta agron., Lisb., 51