关键词: 冬前积温, 河南省, 小麦, 生长发育

Abstract: To provide basis for adjusting the sowing time and improving the utilization of natural resource.The experiment with the scope of accumulated temperature before winter(ATW) from 350 to 900℃·d for three semi-winterness(SW) and three weak springness(WS) wheat varieties was conducted.The results showed that the days and accumulated temperature required from sowing stage to emergence of seedling stage was increased along with ATW decreased.The days and the accumulated temperature increased 0.7 days and 3.7(SW) or 2.5℃·d(WS) respectively with ATW reduced 100℃·d.There was a significantly positive correlation between ATW and foliar age and accumulated temperature required by every leaf before wintering.The foliar age and the accumulated temperature required by every leaf decreased 0.9(SW) or 1.0(WS) leaf and 5.0℃·d respectively with ATW reduces 100℃·d.The date of single and double ridge stage was delayed in the spike differentiation processes along with ATW decreased.The single ridge stage was longer 10.0(SW) or 12.9(WS) days and double ridge stage was shorter 15.5(SW) or 17.4(WS) days approximately with ATW reduced 100℃·d.The results indicated that the suitable ATW for foliar age of sound seedling was 550-750℃·d(SW) and 450-600℃·d(WS),and survive ATW over winter was 650-800℃·d(SW) and 550-700℃·d(WS).Considering to two aspects above,the suitable ATW was 650-750℃·d(SW) and 550-600℃·d(WS) in Henan province.

Key words: Accumulated temperature before winter(ATW), Accumulated temperature before winter(ATW), Henan province, wheat, Growth and development