摘要
利用防雨旱棚设施池栽,在全生育期控水条件下,研究不同水分胁迫程度对夏玉米生长发育和产量形成的影响。结果表明,随水分胁迫加剧,生长发育受抑程度加重,植株绿叶面积及干物质积累量减少,果穗物质来自开花前营养体贮藏的物质的比例上升,产量下降。高产玉米形成果穗物质的构成来源比例为开花前占10%～20%,开花后80%～90%。生殖器官发育对水分胁迫的反应比营养器官敏感。产量因子中,穗粒数受水分影响变幅最大,千粒重相对较稳定。高产玉米节水有一个合理限度,雌穗分化前是节水的主要阶段,雌穗开始分化后应避免出现水分胁迫,雌穗分化之前土壤相对含水量以60%～70%为宜,此后维持在70%～80%为宜。
Summer corn is subjected to different water stress applied in all growth stages. The results show: as water stress increase, the enhanced water stress obstruct the growth and development of summer corn green leaves areas and dry material accumulated reduces, the radio of kernel material coming from stored assimilation before blooming yield reduces, the spike material resources of high-yielding corn are before blooming 10%～20% after blooming 80%～90%, reproduction organs are more sensitive to water stress than nutritional organs, Among the yield components, the Kernel number is mostly affected by water stress, while 1000-kernel weight is relatively more steady, there is a reasonable limit of water reduce for high-yielding corn. Nutritional organ growing term is an important term for water reduce, waterstress showld be avoided after the diversification of female spike, it is proper for the soil relative water content to be maintained at 60%～70% before the diversification of female spike and 70%～80% or so after it.
出处
《莱阳农学院学报》
2003年第2期98-100,共3页
Journal of Laiyang Agricultural College
