山丹军马场地处青藏高原东北边缘,气候特点是高寒偏旱。作物生长发育期常受干旱、低温、霜冻等自然灾害侵袭,粮油作物产量不稳。长期生产实践,人们对夏旱和早霜的认识较深并积累了较多的抗灾经验,但对作物某些生育阶段低温造成的灾害即冷害则认识不足,因此往往把穗荚不实、子粒瘦秕、粒重及容量降低等原因一概认为是干旱或早霜所致,常用冻 Shandan military field is located in the northeast edge of the Qinghai-Tibet Plateau, climate is characterized by cold drought. Crop growth and development are often affected by natural disasters such as drought, low temperature and frost, and the output of grain and oil crops is unstable. Long-term production practice, people have a deeper understanding of summer drought and early frost and accumulated more experiences of disaster resistance, but lack of knowledge about cold damage caused by low temperature at some stages of crop growth. Therefore,秕, grain weight and capacity reduction and other reasons are generally considered due to drought or early frost, commonly used frozen