The main research question of this thesis was: Can nitrogen cycling on dairy farms on peat soil in the Dutch Green Heart area be improved by adapting management to the nitrogen supply from soil and by using other grassland species and crops without affecting milk production?

Strengthening nature and at the same time investing in future-proof agriculture. That is the task of the Minister for Nature and Nitrogen, Christianne van der Wal. It is also the lifework of Leiden professor Jan Willem Erisman. He has been researching nitrogen for his entire career and has shown that…

Statements made by Caroline van der Plas about nitrogen emissions and European law are incorrect: Armin Cuvyers on Dutch radio EenVandaag programme’s item ‘fact or fiction’.

At present, the cabinet still maintains that all provinces are motivated to cooperate with the sensitive issue of the nitrogen strategy. However, there are major concerns that the political landscape will look very different once the elections for the Provincial Councils on 15 March have been held.

These might be ‘just’ provincial council elections in the Netherlands, but the outcome on 15 March could have serious consequences for how the country is governed. Conflicts between the government in The Hague and the provinces, and tension within the Dutch cabinet, might be looming. On 1 July, every…

Freshwater biodiversity has been threatened by eutrophication due to excessive nutrients in the environment. Releasing the freshwater species from such pressures requires efforts from industry and manufacturers to avoid emissions to vulnerable and high-risk regions.

Food production in the Netherlands is an economic success but has led to many environmental issues, including nitrogen pollution. Recently, the policy to allow economic growth while reducing nitrogen losses was disapproved by the highest court in the Netherlands, casting the country into a nitrogen…

Voters sent a clear signal in the recent Dutch provincial council elections with the 'monster' victory for the Farmer-Citizen Movement (BoerBurgerBeweging, BBB). This sign of ‘social resistance’ has consequences for the policy on nitrogen emissions, according to Geerten Boogaard, Professor of Local…

It’s better to cut our nitrogen emissions now than to solve the consequences later at great expense. That’s the lesson we can learn from the Dutch nitrogen crisis, according to nitrogen expert Jan Willem Erisman. In Science, he shares this lesson with other countries. According to Erisman, we should…

Following the Beirut explosion, BBC's podcast series The Foodchain explores the chemical that caused the blast: ammonium nitrate. A compound that is widely used to produce fertilizer. Professor of Environmental sustaibability Jan Willem Erisman tells about the effects of nitrogen on the environment.

Less meat and dairy means more space for nature, leisure, climate, biodiversity, more justice, and it's good news for the economy. That's according to the thought experiment conducted by Strootman Landscape Architects and Leiden environmental scientists. They presented their findings on 11 April.