【摘要】 以通蓖5号和通蓖6号蓖麻为供试品种,对种植密度与株型的关系进行了研究.结果表明,通蓖5号极度稀植处理的优势一级分枝最长,随着种植密度的增加,两个一级分枝有变短的趋势;通蓖6号稀植处理和高密种植处理的两个一级分枝长度大于另两个处理,各处理间二个一级分枝长度的差异未达到显著水平.两个品种两个优势二级分枝的变化规律一致,随着密度的增大变短明显.此外,随着种植密度的增加,两个品种的优势一级分枝粗度、优势二级分枝粗度均呈下降趋势,其门桩与主茎的角度、单株冠幅、门桩穗展、四面斗穗展均呈变小的趋势.更多还原

【Abstract】 The effect of planting density on castor cultivars Tong Bi5 and Tong Bi6 were determined. Tong Bi5 exhibited the longest favorable first grade branch when sparsely-planted and the length of the two first grade branches tended to decrease with the increase of planting density. The two first grade branches of Tong Bi6 when sparsely-planted and high-density levels were longer than the others, and there was no significant difference between these groups in the length of their two first grade branches. The two second branches of both cultivars displayed quite uniform variance trends and length of the two branches were shorter with the increase of density. In addition, the diameter of the favorable first and second grade branches of the two cultivars declined with the increase of planting density. All of the angles between the Men zhuang and the main stem, the canopy of single plant, spike amplitudes of Men zhuang, and Si mian dou showed a trend to be smaller.更多还原