冬小麦越冬死苗是影响小麦产量的一个重要原因,历年都有程度不同的发生。引起越冬死苗的因素很多,如低温、墒情、碱害以及管理不当等。然而,在同样的上述条件下,不同地块的死苗程度却显著不同。通过连续几年大面积用间调查和小区对比试验表明,这种现象现除因品种不同以外,还有一个重要因素,即分蘗节的埋土深度。在我市气候 Winter winter wheat seedlings overwintering is an important factor affecting the yield of wheat, over the years have varying degrees of occurrence. Caused by cold winter seedlings many factors, such as low temperature, moisture, alkali damage and improper management. However, under the same conditions as above, the levels of dead seedling in different plots are significantly different. Through successive years of large-area inter-use surveys and community comparative tests show that this phenomenon is due to the addition of different species, there is an important factor, that is, the depth of the buried section of tillering knot. In my city climate