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１试验方法选用成熟的京早晶一年生枝作插材。１９９８年冬收集符合要求的枝条，将其剪成６０ｃｍ长条，立即送入窖内，埋在干净的湿砂中，砂子含水量要求在１４％左右，埋好以后，在砂堆表面盖一层塑料膜，以防失水干燥。至翌年春天，把这些长条剪成２０ｃｍ左右，带２～３个
1 test method Selection of mature Beijing early grain as an annual seedling. In the winter of 1998, the branches which meet the requirements were collected and cut into 60cm long strips and immediately sent into the cellar and buried in clean wet sand. The moisture content of the sand is required to be about 14% Plastic film layer to prevent dehydration and drying. To the following spring, cut these strips into about 20cm, with 2 to 3