Effect of season and previous seasonal fertilizer N application rates on the response of an S.24 perennial ryegrass/white clover sward to fertilizer N
Marsh, R.; Gordon, F.J.; Murdoch, J.C.; Stevenson, W.E.G.
Journal of Agricultural Science, Cambridge 86(2): 335-342
The effect of season of harvest and previous seasonal applications of fertilizer N on the response of perennial ryegrass/white clover swards to pre-cut applications of fertilizer N was studied in three consecutive years on different sites. Herbage D.M. yield responded in a curvilinear manner to increased pre-cut N application rates. There was a tendency in all experiments for the marginal response of herbage D.M. to increased pre-cut N application rates to decrease as previous seasonal fertilizer N application rates increased.