杂草,系指在田间自然生长的,非人工栽培的植物。它们的繁殖器官称杂草种子。杂草是农业生产的大敌,对于农作物和人类都有危害。杂草对农业的危害主要是杂草本身。杂草生长在田间,与农作物争夺水肥,空间和阳光。杂草生长适应性强,繁殖蔓延快,影响农作物的生长,如 Weeds, refers to the natural growth in the field, non-cultivated plants. Their reproductive organs are called weed seeds. Weeds are the enemy of agricultural production, which is harmful to crops and human beings. Weeds harm to agriculture is mainly weed itself. Weeds grow in the fields, compete with crops for water, fertilizer, space and sunshine. Strong adaptability to weeds growth, reproductive spread fast, affecting the growth of crops, such as