Establishing Nutrition Diagnosis Index of Rubber Latex/Timber Clone Reken 525 in Hainan
In order to provide a reference for rational 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.