NUTRIENT BALANCES IN FIELD VEGETABLE PRODUCTION SYSTEMS

摘要: In this review paper an overview of the nitrogen (N) and phosphorus (P) cycles in agricultural systems is presented. The information summarized provides general on important processes involved as they relate to losses from systems. Such background a prerequisite for designing management strategies achieve sustainable balance between reducing environmental impact N protecting farmers' profitability. field vegetable production most lost via nitrate leaching because often large amounts remain soil after harvest crop. This includes residual mineral present crop residues. Quantitative data are presented N, residues To combat too high soils European Commission has issued Nitrate Directive. Information Directive how Dutch government imposed legislation meet demands given. project "Farming with future" also new been set up Netherlands develop test environmentally economically As example first results project, balances two leek shown.