直根系（taproot system）主根发达、明显，极易与侧根相区别，由这种主根及其各级侧根组成的根系，称为直根系。
直根系 aliphatic amine alkaloid; tap root system; taproot system 主根系 tap root system; taproot system .
基于1个网页-相关网页
由于棉花是直根系作物，根系生长庞大、生育期长，与果树的生长有一定的相似性。
The cotton is similar to fruiter because the cotton roots is taproot and hugeness and growth days is long.
采用土钻法和盆栽试验研究了渭北地区主要造林树种的垂直根系分布特征及其抗旱性。
Methods of soil auger and pot experiment were used to research vertical root distributions and drought resistance of main planting tree species in the Weibei loess plateau.
冰凉花属于宿根植物，其根几乎终生为初生结构。一年生苗直根系的主根和侧根的初生木质部均为二原型。
Adonis amurensis is perennial herb, Its roots are nearly primary structure in the whole life, Primary Xylems of main root and lateral roots of one year seedling are diarch.
应用推荐