钾肥对多年生黑麦草抗旱性的影响

Effect of potassium fertilizer on the drought resistance of Lolium perenne

水分需求过高是阻碍草坪发展的重要因素之一。因此,在不同干旱程度下采用不同浓度钾肥对3个多年生黑麦草Lolium perenne品种进行处理,通过对种子发芽率、植株叶片厚度和根冠比的测定表明,干旱环境下一定浓度的钾肥能显著促进种子发芽率、增大叶片厚度和根冠比,从而提高多年生黑麦草的抗旱能力。同时草坪草对钾肥存在着一个最适范围,只有科学地把握施肥的度量,才能最大限度地促进草坪草生长,从而降低草坪养护成本。

The effects of potassium fertilizer with 3 application levels and different drought stress levels on the growth performance of 3 varieties of perennial ryegrass （Lolium perenne） were tested. The results from the seed germination rate, leaf thickness and root to shoot ratio showed that the potassium fertilizer limited the drought stress significantly and increased the seed germination rates, leaf thickness and root to shoot ratio, enhanced the drought resistance consequently within a proper application rate range.