水稻为三碳植物，其伴生性恶性杂草稗草为四碳植物。
Rice is C_3 plant and its companion, noxious weed barnyardgrass is C_4 plant.
杂草的伴生会使作物的氮素吸收能力增强，但向籽粒的转移会减弱。
Weed lived with crop together could improve absorbing nitrogen ability of crop, while the ability for crop of transferring nitrogen to seeds would decrease.
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