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低山区山杏改造试验１９９３—１９９７年在河北省卢龙县进行山杏低产改造试验。试材为卢龙县刘田庄镇北山村约３５年生山杏大树，共１８０株，零散分布于低山半阳缓坡地带。土壤脊薄，土层厚度约１０ｃｍ。经低产改造后，１９９７年试验树平均单株产杏仁１．１５ｋｇ，比...
Experiment of almond cultivation in low mountain area 1993-1997 Experiment on low yield of almond cultivation in Lulong County, Hebei Province. The test material is about 35-year-old wild apricot trees in Beishan Village, Liutianzhuang Town, Lulong County, with a total of 180 plants distributed scatteredly on the gentle slope of the hilly area in the lower half of the mountain. Thin soil ridge, soil thickness of about 10cm. After the transformation of low-yield, in 1997 the average yield per plant almond 1.15kg, than ...