【摘要】 对不同基因型冬小麦在长春分期播种其穗分化的观察结果表明，冬小麦越冬前穗分化时期与越冬存活率间的关系因基因型的不同而有别，耐寒性较弱的品种以生长锥未伸长期越冬较安全；耐寒性强的品种越冬前处于生长锥伸长期可安全越冬，适播期较宽。穗分化结束日期因品种而不同，但同一品种不同播期间无差异。穗分化总日数与小区产量相关显著。更多还原

【Abstract】 The spike differentiation of winter wheat was investigated in Changchun. The results indicated that the relationship between phase of spike differentiation and frequencies of over wintering was different among genotypes. The varieties with poor winter resistance could over winter during unexserted phase of growing tip and the variety with better winter resistance could over winter during exserted phase of growing tip. The ending date of spike differentiation was shown to be variable in varieties. The correlation was significant in 5% level between the total days of spike differentiation and plot yield.更多还原