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本试验于1962～1967年,1973～1976年,先后在辽南平地棕壤,坡地棕壤、坡地砂石土上进行的,磷肥品种为过磷酸钙、磷矿粉、钙镁磷肥。所内试验的试验树为13～16年生国光苹果树,共四个试验处理:(1)对照树(每株施有机肥200斤,硫铵10斤);(2)每株施有机肥200斤,硫铵10斤,过磷酸钙15斤;(3)每株施有机肥200斤,硫铵10斤,磷矿粉22.5斤;
This experiment was carried out in 1962 ~ 1967, 1973 ~ 1976, successively in the brown soil of Liaodong plain, brown soil of slope land and sandy soil of slope land. The varieties of phosphate fertilizer were superphosphate, phosphate rock and calcium magnesium phosphate fertilizer. The experimental tree within the experiment is 13-16 years old Guoguang apple tree, a total of four experimental treatments: (1) control tree (200 kg of organic fertilizer per plant, 10 kg of ammonium sulfate); (2) 200 kg of organic fertilizer per plant , 10 kg of ammonium sulfate, 15 kg of superphosphate; (3) 200 kg of organic fertilizer per plant, 10 kg of ammonium sulfate and 22.5 kg of phosphate rock;