The relationships between alternate bearing and variations in mineral nutrient composition of the shoots and leaves of pistachio trees (Pistacia vera L. ‘Uzun’) and the effects of these relationships on flower abscission were investigated over 2 years (2015 and 2016). The mineral contents of leaves and shoots of “On” and “Off” year trees were measured at different periods of pistachio growth. Determination of total nitrogen (N) content was performed using a Kjeldahl instrument and other minerals were analyzed using the age-burning method via microwave digestion and by atomic absorption spectrometry. The concentrations of some minerals (P, K, Ca, Mg, Fe, Zn, Mn, and B) were higher in the leaves of “On” trees than in “Off” trees, while some others (N, K, Mg, Ca, Zn, and Cu) were higher in the shoots. The concentrations of N, P, K, Mg, Zn, and Mn in the leaves and shoots reached minimum levels during the flower abscission and nut kernel development period. Fruiting state had a significant effect on the contents of P, K, Zn, and Mg in both leaves and shoots, but did not affect the amount of N in these two organs. Levels of B, a sufficient supply of which is essential for successful flowering, in “On” trees decreased to deficient levels during flower blooming. Our results indicate that N, P, K, Ca, B, and Fe may play key roles in annual fruit production in pistachio and the changes in nutrient content during different development periods are associated with flower abscission.

开心果（Pistacia vera）枝叶矿质营养成分的交替承载与变化的关系 L. 'Uzun') 和这些关系对花脱落的影响进行了 2 年（2015 年和 2016 年）的调查。在开心果生长的不同时期测量了“开”和“关”一年生树的叶子和枝条的矿物质含量。使用凯氏定氮仪测定总氮 (N) 含量，并使用老化燃烧法通过微波消解和原子吸收光谱法分析其他矿物质。某些矿物质（P、K、Ca、Mg、Fe、Zn、Mn 和 B）在“开”树的叶子中的浓度高于“关”树，而其他一些（N、K、Mg、 Ca、Zn 和 Cu）在枝条中较高。叶片和枝条中N、P、K、Mg、Zn和Mn的浓度在落花期和坚果仁发育期达到最低水平。果期对叶片和枝条中P、K、Zn和Mg的含量有显着影响，但对这两个器官中的N含量没有影响。B 的水平，充足的供应对于成功开花至关重要，在开花期间，“On”树中的 B 水平下降到不足的水平。我们的研究结果表明，N、P、K、Ca、B 和 Fe 可能在开心果的年果实产量中起关键作用，不同发育时期养分含量的变化与花脱落有关。