Studies have been made since 1985 on ways of improving the effectiveness of N fertilizers on non-gleyed and weakly gleyed podzolic soils, either undrained or with tile drains, in the Komi Republic (NE part of the Russian continental plateau). On this basis recommendations are made on land improvement by drainage, and on the optimum doses, application times and ways of covering the N fertilizers. These measures will improve crop productivity for annual ryegrass, potatoes, and mixtures (peas/oats, ryegrass/peas, ryegrass/barley, ryegrass/rape).
