一、菜豆的特征特性及其对环境条件的要求(一)菜豆的特征特性:菜豆为一年生的豆科菜豆属的作物,其主要生物学特征特性如下:①根:根富于发达的须根,有根瘤,根深可达1.5—2尺,须根多分布于0.5尺左右的耕土层中。②茎:茎有矮生和蔓生二种。矮生种茎直立,无缠绕性,分枝5—10枚。蔓生种茎 First, the characteristics of beans and their environmental requirements (a) the characteristics of kidney beans: Beans is an annual bean leguminose crop, its main biological characteristics are as follows: ① root: root rich in the developed fibrous roots, There are nodules, roots deep up to 1.5-2 feet, fibrous roots distributed in about 0.5 feet of soil layer. ② stems: stems have dwarf and vine two. Dwarf species stems upright, non-winding, branched 5-10 pieces. Trailing species of stems