Abstract: Potassium application has a positive effect on changing the color, prolonging the green period and improving the quality on turf. In proper time, applying potassium to centipedegrass (Eremochloa ophiuroides) with proper amount could increase chlorophyll content. Potassium benefited to prolong the green period, especially when applying with 4.5g/m² K₂O. It also increased density, strengthened hardiness, resulting in improving the quality of turf at different periods. Equal amount of potassium applied with different frequencies gave the best results than single dose application. Each amount of application could not greater than 2.0g/m² K₂O, and annual amount not greater than 6.0g/m² K₂O. Potassium was required at different growing periods, but the better results were given under high and low temperature conditions.

Key words: centipedegrass, turf, potassium fertilizer, chlorophyll, green degree, quality

摘要： 施K对改善假俭草草坪颜色、延长青绿期、提高品质有一定的作用。适时适量施K,可增加假俭草叶绿素含量;K肥有利于延长青绿期,尤其是4.5g/m² K₂O分三次施用效果更好;施K可增加草坪密度,增强草坪抗性,减轻草坪在不良环境条件下颜色异常现象,从而提高不同时期草坪的品质。等量K肥分次施用的效果好于一次施用,每次施肥量不得高于2.0g/m² K₂O,年总施肥量不得高于6.0g/m²K₂O。假俭草在不同的生长时期都需要K肥,但在高温和低温条件下,施K的效果较好,这与K可提高抗逆性有关。

关键词: 假俭草, 草坪, K肥, 叶绿素, 绿度, 品质