波罗蜜叶片矿质营养元素含量的年动态变化

Annual Variation of Leaf Nutrient Concentration of Jackfruit

【目的】本文探索了波罗蜜矿质营养元素吸收与利用规律。【方法】分析了3月至次年1月‘GHsj1804’、‘GHsj1806’和‘GHsj1808’3个波罗蜜品系的叶片N、P、K、Ca、Mg、Fe、Zn、B等营养元素含量的年动态变化。【结果】不同营养元素的年动态变化模式存在差异,不同品系具有相似的变化模式;叶片氮元素平均含量为13.7068 g/kg,钾元素平均含量为2.9383 g/kg,钙元素平均含量为2.7909 g/kg,磷元素平均含量1.4915 g/kg,镁元素平均含量为510.37 mg/kg,铁元素平均含量为191.54 mg/kg,锌元素的平均含量为79.3998 mg/kg,硼元素平均含量为6.7284 mg/kg;同一元素在不同叶位间的含量具有极显著的相关性,相关系数值在不同品系间存在差异;不同元素间的相关关系在不同株系、不同叶位间存在差异,镁与钾(-0.85^-0.90)、氮与磷(0.50~0.69)在3个品系内都表现出极显著相关。【结论】在利用叶片分析指导施肥时,要根据果园条件和品种类型而异。

【Objective】This paper aimed to study the mechanisms of nutrient intake and utilization in jackfruit. 【Method】The leaf contents of N, P, K, Ca, Mg, Fe, Zn and B in three varieties, ‘GHsj1804’, ‘GHsj1806’ and ‘GHsj1808’, were analyzed using samples collected at half-month interval from March to January. 【Result】Annual dynamics varied with nutrients, but was similar with varieties;The mean nutrient concentrations of N, K, Ca, P, Mg, Fe, Zn and B were 13.7068 g/kg, 2.9383 g/kg, 2.7909 g/kg, 1.4915 g/kg, 510.37 mg/kg, 191.54 mg/kg, 79.3998 mg/kg, 6.7284 mg/kg, respectively;Contents of same nutrient in leaves at different positions correlated significantly, with a varied correlations values among different varieties;Correlations among different nutrient varied with varieties and leaf positions, and in all 3 varieties, Mg and K(0.85-0.90), N and P(0.50-0.69) correlated significantly. 【Conclusion】When using results of leaf analysis as guidelines for fertilization, the factors such as plantation conditions and varieties should be considered seriously.