There's not an absolute moratorium. It's more like an altruistic goal to reduce nitrous oxide emissions by 30%, which we can achieve in a variety of ways. However, it is short-sighted to think that you can implement policies that handcuff farmers' ability to grow crops while at the same time asking farmers to grow crops, contribute to greenhouse gas emission reduction and help reduce climate change. Just in context, 50% of the protein in every man, woman and child on planet Earth comes from nitrogen fertilizer.
Now, we need to improve the efficiency of nitrogen fertilizer. Farmers should be given credit to do so and, rather than with sticks, we should be encouraging them to adopt new technologies with carrots.