In the simulations, those soil emissions were particularly sensitive to two factors: climate, especially temperature, and rates of nitrogen input. (sciencenews.org)
The fact that organic systems are based on lower nitrogen inputs, closed nutrient cy - cles and combined animal and plant production needs to be accounted for, and this requires a holis - tic perspective on the accounting of greenhouse gas emissions from farming systems. (chimalaya.org)
Nutrient reduction plans, implemented since 1987, have reduced nitrogen inputs by 50 % (Carstensen et al. 2006), but primary production remains high (Carstensen et al. 2011). (link.springer.com)