土壤水分与氮肥对玉米根系生长的影响

利用田间小区试验研究了不同土壤水分条件下N肥对根系生长(根长、根重和根冠比)的影响。结果表明,玉米拔节期和开花期无论水分条件如何,施N肥可增加其总根长、表层根长和根重并使根冠比下降;灌浆期施N肥可增加总根长和表层根长,但正常水分条件下N肥使根重和根冠比下降,而干旱条件下N肥对根重和根冠比则无影响。不同处理根冠比大小与N吸收和分配有很大关系。

The effects of soil moisture and nitrogen fertilizer on root growth(root length,weight and root/shoot ra-tio) of corn are studied with simulated field plot experiment. Results indicate that the application of nitrogen fertil-izer makes total root length,surface(0-20cm) root length,root weight increase and root/shoot ratio decrease at the stage of shooting and flowering under both soil moistures. Although nitrogen fertilizer could increase total and surface root length under both soil moistures at the stage ...