The allelopathic effects of Bidens pilosa aqueous extracts in different months within ayear on seed germination and seedling growth of radish,rice and cucumber weretested.

• 测定一年中不同月份采集的三叶鬼针草叶片的水抽提物对萝卜、水稻、黄瓜3种植物种子萌发和幼苗生长的影响。