Abstract Nitrate (NO 3−) leaching from agriculturalproduction systems is blamed for the
rising concentrations ofNO 3− in ground-and surface-waters around the world. This paper …

On organic farms, where the importation of materials to build/maintain soil fertility is
restricted, it is important that a balance between inputs and outputs of nutrients is achieved …

For the past 3.8 billion years, the geochemistry of the Earth's surface-its atmosphere, waters
and exposed crust-has been determined by the presence of biota. Photosynthetic organisms …

We present estimates of total nitrogen and total phosphorus fluxes in rivers to the North
Atlantic Ocean from 14 regions in North America, South America, Europe, and Africa which …

The annual nitrogen (N) budget and groundwater nitrate-N concentrations were studied in
the field in three major intensive cropping systems in Shandong province, north China. In the …

La agricultura tiene efectos directos e indirectos en las tasas y composiciones de la recarga
y de la biogeoquímica de las aguas subterráneas. Entre los primeros, cabe citar la …

This paper analyzes the sequential decision to adopt two site‐specific technologies, soil
testing and variable rate technology, and the impact of adoption on nitrogen productivity …

The relationships between N fertilizer rate, yield, and NO3 leaching need to be quantified to
develop soil and crop management practices that are economically and environmentally …

Abstract Surface water nitrate (NO− 3) pollution from agricultural production is well
established, although few studies have linked field N budgets, NO− 3 loss in tile drained …

This report is the third in a series of six reports developed as the scientific basis for an
integrated assessment of the causes and consequences of hypoxia in the Gulf of Mexico, as …