… of the nitrogen supply can create environmental hazards. The nitrogen management principles
described in this book promote judicious global management of our nitrogen resources. …

… This report explores the use of nitrogen in US agriculture and assesses changes in nutrient
… nitrogen use efficiency. It also reviews a number of policy approaches for improving nitrogen …

… the transformation and transport processes of nitrogen (N) in agricultural systems and provides
information on overall reservoir sizes for N. Nitrogen is ubiquitous in the environment and …

… A combination of quantitative systems research, development of best practices and … agricultural
systems. The growing complexity of managing N in sustainable agricultural systems calls …

… reconsidered N 2 fixation inputs into agricultural systems. As in past reviews (eg Smil 1999),
we included cultivated land used for agriculture, but also included uncultivated agricultural …

… N budgets in agricultural systems. Hence, we conducted a global analysis on the current status
of the N flows in the agricultural systems, … regulations on controlling N pollution. Globally, …

… characteristic of these early agricultural systems. Over time, agriculture evolved to overcome
… Today, many agricultural breeding programs are conducted in environments where inputs …

… in sewage systems, termed indirect … of N in agricultural systems as anthropogenic; including
synthetic fertilizers, animal manures (urine and feces), N derived from enhanced biological N…

… to increase crop or pasture yields and to substitute N fertiliser … examine several types of
agricultural systems utilised in the … adopted to preserve their agricultural productivity through the …

… total N budgets are … agricultural systems are significant, and to what extent they pose a risk
to human health and the environment. Dissolved organic N losses across agricultural systems …