Three culm traits,basal culm thickness(BCT),culm length (CL) and culm strength (CS),of DH lines and their parents under upland and lowland ecosystems at milk stage were studied.

• 在水田、旱田栽培条件下 ,考查了乳熟期DH系及其亲本的茎基粗、茎秆长及茎秆强度等性状。