施肥量与修剪高度对草地早熟禾褐斑病的影响

Effects of Fertilizing Amount and Mowing Height on the Brown Patch of Kentucky Bluegrass

为探究施肥与修剪对草地早熟禾(Poa pratensis)草坪褐斑病病情的影响,在草地早熟禾草坪上设置不同的修剪高度(2.7,4.5 cm)和施肥量(年施氮量8,15,25 g·m^-2),观测不同处理小区草坪褐斑病的发病情况。在大田中进行了2年重复性试验,结果表明:随着施肥量的增加,低修剪处理草坪的发病率上升,高修剪处理草坪的发病率则呈现先上升后下降的趋势,修剪高度和施肥量之间互作明显。发病前低量施肥是较好的施肥方案;高修剪草坪比低修剪草坪具有更强的恢复性。

To determine the effects of mowing and fertilization on the brown patch of Kentucky bluegrass,two kinds of mowing heights （2.7 cm,4.5 cm） and three kinds of fertilizing amounts （Annual Nitrogen 8 g · m-2,15 g · m-2and 25 g · m-2） were set on Kentucky bluegrass turf,and the brown patch occurrence of different treatments was observed.The experiment was conducted repeatedly for 2 years in the field.The results showed that with the increase of fertilization amount,the incidence of brown patch increased under low mowing height condition,whereas the incidence of brown patch increased first and then decreased under high mowing height condition.Moreover,the obvious interaction between mowing height and fertilization amount was found.It was inferred that low fertility was a better fertilizer regime before the occurrence of brown patch,and the turf of high mowing height had stronger recovery ability from disease than the lower one.