The various nitrogen compounds play a key role in the environment. Their enrichment by man leads to grave problems in the air, ground and water for human beings, animals and plants. For an effective remedy, measures in all areas of causes are necessary. The endeavour must be to obtain the largest possible benefit for the environment and national economy with every franc available for ecological protection. A large requirement of action exists especially in agriculture. By means of a total approach towards the nitrogen-environment-problems, a persistent development can thus be initiated.