晚花果树品种和延迟花期砧木选育研究进展张运涛，孙海琴，郭军涛（河北农业技术师范学院园艺系昌黎０６６６００）早花果树指常年早春晚霜来临之前开花的树种或品种。在世界许多果产区，花期霜冻给果树生产带来巨大损失，在我国燕山山区的杏、山杏、安梨和祝光苹果等，也... Advances in research on late flowering fruit tree varieties and delayed flowering rootstocks ZHANG Yun - tao, SUN Hai - qin, GUO Jun - tao (Department of Horticulture, Hebei Agricultural and Technical Teachers College, Changli 066600) The early - flowering fruit tree refers to the species or species of flowers blooming before the frost in the early spring. In many fruit producing areas in the world, the flowering frost has brought tremendous losses to the production of fruit trees. In China’s Yanshan Mountains, there are apricot, apricot, pear and apple and so on.