Therefore, this project investigates potential mitigation strategies for vegetable crop rotations involving cauliflower as a model system with a high amount of N in crop residues and thus high risk for N emissions. The experimental factors tested/taken into account involve the type of application as well as the soil type. The results are supposed to form the data basis for both the identification of suitable mitigation strategies and the amendment of the fertilization support system N-Expert.
Development of an integrated N management system in field vegetable production systems to reduce N balance surpluses. Sub-Project IGZ: Gaseous N losses and modelling
2010 - 2013
Field vegetable production systems are especially prone to N losses with N balance surpluses frequently as high as 200 kg N ha–1 yr–1. Results of field experiments indicate that gaseous N losses from crop residues in the form of nitric oxide (NO), nitrogen dioxide (NO2), nitrous oxide (N2O), molecular nitrogen (N2), and ammonia (NH3) can constitute a relevant proportion of these losses. Regarding their negative impact on other ecosystems, such as the contribution of NOx and NH3 to acidification and eutrophication as well as the contribution of N2O to the human-made greenhouse effect of about 6%, these emissions should be kept as low as possible.