不同生育时期干旱对玉米杂交种性状的影响

利用4个广泛种植的玉米杂交种,在干旱地区自然降水条件下,进行不同生育时期的干旱处理,研究不同生育时期干旱对玉米杂交种农艺经济性状的影响.研究表明,玉米的株高、穗位高、节间长、节间数、节间均值只受到生育前期干旱的影响,而茎粗基本上不受干旱的影响,玉米的节间数在干旱条件下没有规律性的变化;产量、成穗率、穗长、穗粗、行粒数、穗粒数、穗重、穗粒重、出籽率、千粒重严重受到不同生育时期干旱的影响(秃尖长显著),与水分的供给时期和次数呈现出一定的正相关,各性状在大喇叭口期到灌浆期受到水分变化的影响最明显;秃尖长、出籽率在不同干旱处理间显著差异幅度较小;穗行数不受干旱的影响.

Effects on Traits of Corn Hybrids Under Drought at the Different Growing Stages

The effects of trials on four-main planting corn hybrids were analyzed under the drought at the dif-ferent growing stages in the natural rainfall in the area of drought.The results showed that except plant diameter,plant height,ear height,section height ,section number,and each section height in plant were influenced by the drought in prophase.Yield,percentage of seeded ear in all plant,ear length,ear diameter,grain number per row,ker-nel number per ear,ear weight,grain weight per ear,percentage of thresh,and1000-grains weight were very influ-enced by drought in different stages except rows per ear,and had a positive correlation with the time and stage of giving water,and the most effect in seedling and flowing stage.