玉米根系的生长及其在土壤中的分布

ROOT GROWTH AND DISTRIBUTION IN SOIL OF MAIZE

利用池栽网架法和根系双向切片法研究了玉米根系的生长动态及其在土层中的分布。结果表明,初生根和第1～4层次生根与地面呈小于45°的夹角伸长。随着根层数的提高,次生根与地面的夹角逐渐增大。根系干重的85％～90％分布于距植株20cm、深40cm的柱状土壤内。鲁三9号根系的水平分布较鲁原单4号分布集中。

Root groeth and its distribution of maize(Zea may L.)were studied with the methods of pool culture with net frame and root cutting collection.The result showed that primary root and the frist to fourth layer of secondary roots grew downward with angles less than 45°to the ground.The angles became larger with the increases of root layers.About 85% ～90% root dry weight distributed in a cylinder of soil with 20cm in radius form the plant and 40cm in depth.Lu San9 has more condensed root than that of Lu Yuan Dan 4 on horizontality.