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.
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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