Trindade, H.Pereira, J.Coutinho, J.Moreira N, N.2012-04-102012-04-102006Trindade H., Pereira J., Coutinho J., Moreira N., 2006. Effect of time and rate of cattle-slurry application on nitrate concentration of drainage water in a double-cropping forage system. In: Søren O. Petersen (Ed.). Technology for recycling of manure and organic residues in a whole-farm perspective. Vol. II, DIAS report no. 123, DK, ISBN 87-88976-99-8, pp. 273-276.http://hdl.handle.net/10400.19/1056In the NW region of Portugal a very intensive dairy farming system has been developed based on two silage crops per year (maize plus a winter crop), which has important risks of nitrate leaching losses during the winter season. These soils receive N inputs as high as 600-730 kg N ha -1 yr -1 resulting from two applications of dairy-cattle slurry just before sowing each crop, and 220-300 kg N ha -1 yr -1 from mineral fertilizers (Trindade et al., 1997). The objectives of our study were to evaluate the effect of cattle-slurry rate and time of application on nitrate-N concentration of drainage water during the winter crop (Lolium multiflorum Lam.) growth period.engCattlecattle-slurryconference object