A field experiment was conducted to determine the relationships between the yield loss of summer maize and the infestations of Amaranthus retroflexus and PoHulaca oleracea.

• 为了明确杂草种类对杂草密度与夏玉米产量损失之间的函数关系的影响及反枝苋和马齿苋为害夏玉米的产量损失模型,在田间开展了此项研究。