Effect of application of herbicides with fertilizer on growth of seashore paspalum and seashore paspalum overseeded by perennial ryegrass

Field experiments were conducted from 2009 to 2010 to determine the injuring of perennial ryegrass (Lolium perene cv. Overseed 2# ) overseeded in seashore paspalum (Paspalum vaginatum cv. Salam) by mixing application of herbicides with fertilizer（The trade product contained 4.5 g/m2 of N plus 1.5 g/m2 of P2O5 and 3 g/m2 of K2O）. This study showed that Chlosulfuron at 0.027 kg ai/ha and sulfosulfuron at 0.01 kg ai/ha resulted in excellent seashore paspalum safety when applied alone or mixing with fertilizer in Nov. 2009. While neglecting minor leaf discoloration of turf was demonstrated at 2 WAA (Weeks After Application) by diuron at 1.6 kg ai/ha alone. The dormancy stage of turf had been prolonged for 5 days when mixing diuron and fertilizer comparing with the untreated plots. The ryegrass eliminated at 2-3 WAA caused by 3 herbicides both along using or mixing with fertilizer treated in late May, 2010. No injuring of seashore paspalum caused by chlosulfuron at 0.027 kg ai/ha alone or mixing with fertilizer. Neglecting tiny leaf discoloration of turf occurred with the sulfosulfuron at 0.01 kg ai/ha alone or mixing with fertilizer and recovered 5-6 WAA. Moderate discoloration with thickness of turf caused by diuron 1.6 kg ai/ha at 2 WAA and recovered at 7 WAA. Visible severe leaf discoloration with some necrosis of turf occurred due to mixing application with diuron 1.6 kg ai/ha and fertilizer lasting from 2 to 5 WAA and recovered at 9 WAA with remarkable thickness.