1981—1982年,我所用栽培箱、壕沟、桶栽等方法,对春玉米根系形态进行了观察。现根据根系生育特点,提出苗期田间管理的几点看法。一、春玉米苗期根系的生育特点(一)根系在土壤中的分布玉米是深根型须根系作物,成熟时根系下伸达1.8米左右。苗期根系在土壤中下伸深度为60—70厘米,大多数根系分布在0—30厘米土层内,0—15厘米土层是次生根的主要生长区域,横向分布在32—52厘米范围内。15—70厘米土层是胚根的主要生长区域,横向分布在12—30厘米之间(表1)。 1981-1982, I used the cultivation boxes, trenches, barrels and other methods, the spring corn root morphology were observed. Now based on the characteristics of root growth, put forward some ideas of field management at seedling stage. First, spring maize seedling root growth characteristics (A) root distribution in the soil Corn is a deep-rooted fibrous root crops, root elongation reached 1.8 meters at maturity. The seedling root descent depth in the soil 60-70 cm, most of the roots distributed in 0-30 cm soil layer, 0-15 cm soil layer is the main growth area of ​​secondary roots, the horizontal distribution in the range of 32-52 cm Inside. The 15-70 cm soil layer is the main growth area for the radicle and is laterally distributed between 12-30 cm (Table 1).