红枣树氮、磷、钾吸收与累积年周期变化规律

Study on N,P,K absorption and accumulation in Zizvphus jujube tree

以6年树龄红枣树为试材,采用刨根、分解取样的方法,研究了年周期内各器官的生物量、氮、磷、钾含量和氮磷钾累积量变化动态。结果表明,红枣各器官中干物质、氮、磷、钾的积累均随生育期的推进呈增长趋势,从果实膨大期到果实成熟期均有一个急剧的上升过程。红枣树单株生物量年增加3908.5 g,氮、磷和钾年总吸收积累量分别为70.5、19.9和99.3 g。其中果实成熟期是氮、磷、钾素主要吸收积累期,分别占吸收总量的55.6%、68.1%和56.1%;每生产1000 kg红枣果实,需要吸收氮、磷和钾素分别为14.1、4.5和19.9 kg。

The yearly biomass,contents of nitrogen,phosphorus and potassium and their accumulation at different parts of Chinese jujube（Zizvphus jujube） tree were studied.The trees are cultivated about 6 years under field condition.The results show that the cumulative amounts of dry matter,N,P and K in all organs are increased with the growth and development of Chinese jujube,especially from the fruit expanding stage to harvest stage.The yearly biomass increase is about 3908.5 g/plant.Total nitrogen,phosphorus and potassium absorption rates are 70.5,19.9 and 99.3 g/plant in one year of the growing period,in which 55.6%、 68.1% and 56.1% are absorbed during the harvest stage.To attain 1000 kg economic yield,Zizvphus jujube tree should uptake N 14.1,P 4.5 and K 19.9 kg.