In order to provide a reference for rationed application of fertilizer, high yield and stable yield of the latex/timber clone, nutrition diagnosis gradation index system of the latex/timber clone Reken 525 were established. Based on the 2 years "3414" field experiments of Longjiang, data were analyzed by the method of nutrition plentiful-lack index. Soil total nitrogen (TN), available phosphorus (AP), available potassium (AK) and leaf total nitrogen (LTN), available potassium (LAK) were classified as low, medium and high based on the relative yield of 70% and 90%. The results indicated that the soil nutrient was classified by low when TN < 0.6 g/kg, AP < 2.0 mg/kg, AK < 50 mg/kg. The soil nutrient was classified by medium when TN was about 0.6-0.8 g/kg, AP 2.0-3.5 mg/kg, AK 50-70 mg/kg. The soil nutrient was classified by high when TN > 0.8 g/kg, AP > 3.5 mg/kg, AK > 70 mg/kg; The leaf nutrient was classified by low when LTN < 28 g/kg and LAK < 8 g/kg. The leaf nutrient was classified by medium when LTN was 28-33 g/kg and LAK 8-11 g/kg. The leaf nutrient was classified by high when LTN > 33 g/kg and LAK > 11 g/kg. The best time to use leaf for nutritional diagnosis was July, August and September. Therefore, establishing nutrition diagnosis index of latex/timber clone based on " 3414" field experimental data was practicable.%采用养分丰缺指标法,对龙江农场热垦525两年的“3414”试验数据进行分析,以相对产量70％和90％为标准将土壤全氮、有效磷、速效钾以及叶片全氮、全钾等养分指标划分为低、中、高三级.结果表明:热垦525的土壤氮、磷、钾养分低水平指标为全氮＜0.6 g/kg、有效磷＜2.0 mg/kg、速效钾＜50 mg/kg,中水平指标为全氮0.6～0.8g/kg、有效磷2.0～3.5 mg/kg、速效钾50～70 mg/kg,高水平指标为全氮＞0.8g/kg、有效磷＞3.5 mg/kg、速效钾＞70 mg/kg;叶片氮、钾养分低水平指标为全氮＜28 g/kg、全钾＜8 g/kg,中水平指标为全氮28～33 g/kg、全钾8～11 g/kg,高水平指标为全氮＞33 g/kg、全钾＞11 g/kg.利用叶片进行营养诊断的最佳时期为每年的7、8、9月份.综合而言,应用“3414”试验能够很好的建立胶木兼优品种的营养诊断指标体系.
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