There was not a significant difference in root surface area of rice by comparing with the control treatment.
鸭稻共作方式下水稻根系总长变化无明显规律，根系表面积与常规栽培方式下相比无显著差异。
The rice varieties with strong root system, large active absorption root surface and total root surface area had strong tolerance to copper poison.
根系发达、根系活跃吸收表面积及总吸收表面积大的品种，有较强的耐铜毒性。
The rice varieties with strong root system, large active absorption root surface and total root surface area had strong tolerance to copper poison.
根系发达、根系活跃吸收表面积及总吸收表面积大的品种，有较强的耐铜毒性。
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