Abstract

水稻株型结构能够影响水稻的产量和品质。稻鸭共作能否对水稻株型结构产生影响, 目前这方面的定量研究还很少。本研究通过田间对比试验, 探讨了稻鸭共作与常规稻作两种处理对水稻分蘖期和齐穗期的部分株型结构指标的影响。结果表明, 与常规稻作方式相比, 稻鸭共作使水稻基部宽度呈减小趋势、冠层幅度呈增大趋势, 最终使植株松散度显著增加, 分蘖期和齐穗期增幅分别为12.2%和42.3%。稻鸭共作使水稻倒3叶和倒4叶的叶长、叶开角和披垂度减少, 使剑叶和倒2叶的叶长、叶开角和披垂度增大, 从而使水稻呈上披下挺的株型结构, 并使叶面积主要分布于上部叶片。稻鸭共作使水稻植株的基叶高呈增加趋势, 在齐穗期与常规处理达到显著性差异。稻鸭共作有利于水稻生育前期和中期的茎蘖合理发展, 而且在后期可促进水稻上部功能叶片的生长, 这在一定程度上有利于水稻高产的形成。

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