本研究通过对不同生育阶段水稻根群形态的观测,希冀揭示根群的形成规律,为调控稻根发育提供理论依据。在大田栽培条件下,于分蘖始期(植后7天)、分蘖盛期(植后22天)、穗分化初期(植后33天)和抽穗期(植后58天),应用改良Monolith法,掘取以2株稻桩为中线,表面积5×35厘米,深40厘米土层的稻根,固定根群自然伸展形态后,清除根际泥沙杂物,取2株稻子中心为端点的根群部分,分层次称取干重,用炭水法测量根体积。结果如下: In this study, we observed the morphology of rice root groups at different stages of growth, hoping to reveal the rule of root formation and provide a theoretical basis for the regulation of rice root development. Under the conditions of field cultivation, the improved Monolith method was used in the early tillering stage (7 days after planting), the tillering stage (22 days after planting), the early stage of ear differentiation (33 days after planting) and the heading stage (58 days after planting) Roots of rice with two rice piles as midline and a surface area of ​​5 × 35 cm and depth of 40 cm were excavated to remove rhizosphere sediment after fixing their natural extension. Group part, weighed dry weight, measured by carbon water root volume. The result is as follows: