ABSTRACT We tested whether selection of ryegrass for reduced root hair length and density would reduce root competition on white clover for phosphate (P). A Rhizosheath Selection Tool was used to select two ryegrass populations with contrasting root hair traits. These were grown at five soil P levels in a glasshouse experiment and rhizosheath trait selection had no effect on growth or shoot P concentrations. The ryegrass populations were also grown with white clover in soils with Olsen P12 or 19 mg L−1. In the Olsen P12 soil, clover grown with the smaller rhizosheath ryegrass had significantly heavier shoots and contained more P than clover grown with the larger rhizosheath ryegrass. In the Olsen P19 soil differences in ryegrass rhizosheath had no effect on clover growth. The results showed that under the experimental conditions, grass-clover competition for soil P could be modified by the rhizosheath traits of ryegrass.

中文翻译：

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使用根鞘选择工具筛选多年生黑麦草的根毛特征，以减少与白三叶草的根系竞争

摘要 我们测试了选择黑麦草以减少根毛长度和密度是否会减少白三叶草对磷酸盐 (P) 的根竞争。使用根鞘选择工具选择具有对比根毛特征的两个黑麦草种群。在温室试验中，它们在五个土壤磷水平下生长，根鞘性状选择对生长或芽磷浓度没有影响。黑麦草种群也在含有 Olsen P12 或 19 mg L-1 的土壤中与白三叶草一起生长。在 Olsen P12 土壤中，种植较小根鞘黑麦草的三叶草比种植较大根鞘黑麦草的三叶草具有更重的枝条，并且含有更多的磷。在 Olsen P19 土壤中，黑麦草根鞘的差异对三叶草的生长没有影响。结果表明，在实验条件下，