Managing nitrogen for groundwater quality and farm profitability: overview and introduction - Keeney, D.R.=700 1 Follet, R.F.
Ilus.; 20 ref.
Keywords: ABONOS NITROGENADOS; CONSUMO; MERCADOS; MEDIO AMBIENTE; TOXICIDAD; POLUCION; POBLACION RURAL; DISTRIBUCION GEOGRAFICA; CONCENTRACION; ANALISIS ECONOMICO