刈割与品种对白三叶／多年生黑麦草混播种群生长的影响

研究了刈割频率与品种对白三叶／多年生黑麦草混播种群生长动态及种间相容性的影响，刈割频率效应主要表现在夏季，高频率刈割明显提高了草群中白三叶组分比例，而对黑麦草具有抑制作用，尽管３个白三叶供试品种对高频率刈割的反应存在着差异，虽然春，秋季刈割频率效应不显著，但其变化趋势仍是，高频率刈割白三叶组分比例高于低频率刈割。白三叶品种对春，夏，秋各季混播草地组分种群生长动态部产生了极显著的影响，两种刈割频率下

Growth Dynamics and Interspecific Compatibility of White Clover/Ryegrass Mixtures as Influenced by Cutting Frequency and Cultivar

The effects of cutting frequency and cultivor on growth dynamics and interspecific compatibility of white clover/ryegrass mixtures without application of fertilizer N were examined in a split- plot field cutting trial at Wageningen, The Netherlands in 1994. Cutting treatment showed only a significant effect on the growth dynamics of the mixture components in summer. The high cutting frequency produced a significantly higher relative DM yield than the low cutting frequency despite the large differences in responses of clover cultivors to the high cutting frequency. Clover cultivor showed highly significant effects on the growth dynamics of the mixture components in spring, summer and autumn,while the mixtures with Alice had a significantly higher relative DM yield of clover with less grass than other mixtures, but no significant difference was seen between the mixtures of Gwenda and Retor with one exception in autumn under the high cutting frequency regime. Companion grass cultivar did not affect relative DM yield. The effects of cutting and clover cultivar on the dynamics of the mixture components had resulted in varying compatibilities of the mixtures; the best compatibility was produced for the mixtures with the medium- leaved cv. Retor;intermediate compatibility for the mixtures with the small-leaved cv. Gwenda and least compatibility for the mixtures with the large-leaved cv. Alice.