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1 材料与方法1.1 供试肥料尿素 :含 N4 6 .3% (河南安阳化肥厂 ) ;过磷酸钙 :有效磷含量≥ 17% (贵州磷肥厂 ) ;氮化钾 :有效含量≥85% (青海盐湖集团 )。1.2 试验方法试验在新郑市孟庄镇小孙庄枣园中进行 ,供试枣树品种为灰枣 ,树龄 30年。该园为平地 ,沙壤土 ,选择树势、
1 Materials and methods 1.1 Fertilizer urea: N4 6 .3% (Henan Anyang Chemical Fertilizer Plant); superphosphate: ≥ 17% of available phosphorus (Guizhou phosphate fertilizer plant); Potassium nitride: ≥ 85% of the effective content (Qinghai Salt Lake Group). 1.2 Test Method The test was conducted in Xiaoshuangzhuang Jujube Garden, Mengzhuang Town, Xinzheng City. The tested jujube variety was Jujube with the age of 30 years. The park is flat, sandy loam, choose tree potential,