Long-term nitrogen fertilizer replacement value of cattle manures applied to cut grassland

Manures supply nitrogen (N) to crops beyond the year of application. This N must be taken into account for agronomic and environmental reasons. From 2002 to 2006 we conducted a field experiment on a sandy soil in The Netherlands (52°03¿N, 6°18¿E) to better quantify this residual N effect. Treatments comprised different time series of mineral fertilizer N or cattle manures of different compositions, all applied at a rate of 300 kg total N ha¿1 year¿1, whilst compensating for differences in available potassium and phosphorus. Dry matter and N yields of cut grassland responded positively (P¿