第一讲 农田杂草的概念和分类 一、农田杂草的概念 众所周知,自然界植物的种类很多,但归纳起来大致分为三类:一类是在自然界自生自灭的植物,称野生植物;二类是人类栽培的植物,称栽培植物;三类是杂草,它既不同于野生植物,也不同于栽培植物,是我们农业生产中要研究防除的对象。 什么叫农田杂草,南京农学院李扬汉教授给下了个很好的定义,即:“田园杂草是在人们长期与之作斗争的情况下发展起来的。杂草具有同作物不断地竞争的能力,它们比作物 First, the concept and classification of farmland weeds First, the concept of farmland weeds As we all know, there are many kinds of plants in nature, but summed up broadly divided into three categories: one is in nature, plants, called wild plants; two Classes are human cultivated plants, called cultivated plants; three are weeds, which is different from wild plants, but also different from cultivated plants, which is the object of our agricultural production research and prevention. What is farmland weeds, Professor Li Yanghan of Nanjing Agricultural College gave a very good definition, namely: "Pastoral weeds in the long-term struggle with people developed under the condition of weeds with the crops continue to compete Ability, they are more than crops