1987年夏,波兰华沙农业大学果树系主任沙都斯基教授,波里士加博士和查尔年斯基博士等三位专家来华半个月,先后访问了北京农业大学园艺系果树营养研究室;大连农业科学研究所果树砧木试验区,华侨农场大面积苹果丰产栽培实验地;在黑龙江省访问了东北农学院园艺系小浆果引种试栽与新品种选育圃,黑龙江省园艺研究所梨树品种选育圃,尚志县石 In the summer of 1987, three experts such as Professor Sardusky, Dr. Boryshka and Dr. Charles Nilski, Director of the Department of Fruit Trees, Warsaw Agricultural University in Poland, visited China for half a month and visited the Fruit Tree Nutrition Research Department of Horticulture Department of Beijing Agricultural University Room; Dalian Institute of Agricultural Sciences fruit rootstock test area, overseas Chinese farm large-scale apple cultivation experiment; visited Heilongjiang Province Department of Horticulture, Department of Horticulture introduced a small planted seedlings and new varieties of breeding nursery, Pear Institute of Horticulture in Heilongjiang Province pear Tree species selection nursery, Shangzhi County stone