The effects of frequency of cutting and cultivar on the period of leaf expansion in white clover grown in mixed swards
The effects of frequency of cutting and cultivar on the period of leaf expansion in white clover grown in mixed swards
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DOI：
10.1046/j.1365-2494.2000.00214.x
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发表时间：
2000-09
影响因子：
2.4
通讯作者：
Li Fengrui
中科院分区：
文献类型：
--
作者：
Li Fengrui
在荷兰进行的田间试验中，研究了白色三叶草（Trifolium repens）与多年生黑麦草（Lolium perenne）混播草地的展叶期以及展叶期与叶片出现率之间的关系，试验中采用了两种刈割频率（低和高）和三个白色三叶草品种（Alice、Retor和Gwenda）。在较低的刈割频率下，展叶期与出叶率呈显著正相关，表明较长的刈割间隔可能使展叶率和出叶率的品种和环境差异得以体现。在大多数情况下，频繁刈割往往缩短了展叶期，这可能是导致高频率刈割处理干物质产量较低的一个重要原因。大叶CV.在秋季频繁刈割条件下，爱丽丝的展叶期显著长于其他品种。这可能部分地解释了与Alice的混合物在秋季具有比与Retor和Gwenda的混合物更大比例的白色三叶草。一些低和高频率的切割处理之间的变化，在叶片扩展期间可以解释的平均和最低温度（38%和15%）。
The period of leaf expansion in white clover (Trifolium repens) grown with perennial ryegrass (Lolium perenne) in mixed swards and the relationship between the period of leaf expansion and leaf appearance rate were examined in a field experiment in The Netherlands in which two cutting frequencies (low and high) and three white clover cultivars (Alice, Retor and Gwenda) were used. A significant positive correlation existed between the period of leaf expansion and leaf appearance rate under a low frequency of cutting, indicating that a longer cutting interval might allow the expression of cultivar and environmental differences in both leaf expansion and leaf appearance rate. In most cases, frequent cutting tended to shorten the period of leaf expansion, which may be an important cause of lower dry-matter yield in the high frequency of cutting treatment. The large-leaved cv. Alice had a significantly longer period of leaf expansion than the other cultivars under frequent cutting in autumn. This might partly account for the mixtures with Alice having a greater proportion of white clover than the mixtures with Retor and Gwenda in autumn. Some of the variation between low- and high-frequency cutting treatments in the period of leaf expansion could be explained by mean and minimum temperatures (38% and 15% respectively).