2003年安徽省中稻花期高温热害的调查与分析

根据对2003年安徽省江淮地区单季中稻结实率的调查,结合气象资料和栽培技术资料进行分析,初步认为,2003年安徽省单季中稻大面积严重减产的主要原因是花期持续高温导致结实率严重下降,同一品种抽穗期不同,受害程度不同;同田块不同稻穗或同一穗的不同部位颖花,受害程度也有差异,表明花期与高温重叠时间越长,受害越重.不同品种间凡是高温期抽穗开花的,结实率均下降,但程度有差异,可能与不同品种的耐热性有关.还对今后的防御措施进行了讨论.

Investigation and Analysis of Heat Damage on Rice at Blossoming Stage in Anhui Province in 2003

According to the metrological data and cultivation technique,investigation on heat damage was carried out in Jianghuai areas of Anhui Province.It is indicated that continued higher temperature at blossoming stage caused the seed rate low.Furthermore,different degree damages were found at different blossoming stages in the same variety and different ears in the same field or different spikelets.It is concluded that the longer the blossoming period and high temperature overlapped the heavier the damage was,and different degree damages of seed rate might be related to the heat-endurance of different varieties.