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1976年至1978年分别在朝阳地区黄白土、黄粘土和红粘土上进行了苹果树氮磷钾配比的肥效试验.试验区土壤水解氮10ppm左右,速效氮10~25ppm,速效钾25~100ppm;pH7.0~7.6;有机质0.76~1.26%.试验树龄为18~20年生国光.试验设六个处理:①每株施硫酸铵10斤,过石6斤,硫酸钾4斤,其氮:磷:钾为1:0.5:1;②硫酸铵10斤,过石6斤,硫酸钾2斤,氮:磷:钾为1:0.5:0.5;③硫酸铵10斤,过石6斤,硫酸钾1斤,氮:磷:钾为1:0.5:0.25;④硫酸铵10斤,过石12斤,硫酸钾1斤,氮:磷:钾为1:1:0.25;⑤硫酸铵10斤,过石18斤,硫酸钾1
Fertilizer experiments were conducted on yellowish white clay, yellow clay and red clay in Chaoyang area from 1976 to 1978. The soil hydrolyzed nitrogen was about 10ppm, the available nitrogen was 10 ~ 25ppm, the available potassium was 25 ~ 100ppm ; pH7.0 ~ 7.6; Organic matter 0.76 ~ 1.26% .Guangguang experimental age of 18 to 20 yearsGuangguang.Experiment set six treatments: ① each plant applied ammonium sulfate 10 pounds, 6 pounds over stone, potassium sulfate 4 pounds, the nitrogen: Phosphorus: potassium 1: 0.5: 1; ② 10 kg of ammonium sulfate, 6 kg over stone, 2 kg of potassium sulfate, nitrogen: phosphorus: potassium 1: 0.5: 0.5; ③ 10 kg of ammonium sulfate, Potassium 1 kg, nitrogen: phosphorus: potassium 1: 0.5: 0.25; ④ 10 kg of ammonium sulfate, over 12 pounds of stone, potassium sulfate 1 kg, nitrogen: phosphorus: Over 18 pounds of stone, potassium sulfate 1