以四川峨眉山野生假俭草(Eremochl oaophiuroides L.)为实验材料,施以不同浓度的K肥(1 0～2.5g·m^-2K2O),观察草坪种群形成过程。结果表明,1.0和1.5g·m^-2K₂O处理组假俭草的生长速度与对照差异显著(P<0.05);1.0、1.5和2.0g·m^-2K₂O处理组的平均分蘖数与对照的差异达极显著水平(P<0.01);1.5g·m^-2K₂O处理组根系长度与对照差异达显著水平(P<0.05);4个处理组的根冠比分别比对照增加了35.61%、50.61%、21.91%和20.90%。其中1.5g·m^-2K₂O处理组与对照差异达显著水平(P<0.05)。低浓度处理(1.0和1.5g·m^-2K₂O)使草坪成坪时间提前3～5d。钾对假俭草草坪种群形成有影响,适宜施用量为1.0～1.5g·m^-2K₂O。钾肥主要在施用1～3周内起作用,5～10d肥效高,而后逐渐减弱。

Through random trial design with four K gradients(1.0,1.5,2.0 and 2.5 g·m^{- 2}K₂O),the effect of potassium on lawn population formation of wild Eremochloa ophiuroides L. from Mt. E-mei in Sichuan Provincewas investigated. It was found that compared with the control, both 1.0 and 1.5 g·m^{- 2} K₂O treatments had a significant difference in growth velocity(P< 0.05); for average tiller number, 1.0- 2.0 g·m^{- 2} K₂O treatments were all highly significant(P< 0.01); as to root system, 1.5 g·m^{- 2} K₂O treatment was significantly different with CK. The root/shoot ratio of four treatments increased by 35.61%, 50.61%, 21.91% and 20.90% respectively, and 1.5 g·m^{- 2} K₂O treatmentwas significant difference with CK. Both 1.0 and 1.5 g·m^{- 2} K₂O treatments could form. lawn ahead of 3- 5 d. Therefore, K has a positive effect on lawn population formation and the proper fertilizer quantity is 1.0- 1.5 g·m^{- 2} K₂O.After K applied, it has obvious effect in 1- 3 weeks and the high efficiency is after 5- 10 d and gradual weakening after that.