Turkey is a country with rich in plant genetic resources and diversity because of having both
suitable geographical and different climate characteristics. Pistachio is a traditionally very
important crop grown extensively in the South East Anatolia region of Turkey. In this region the
most important problem is alternate bearing that yied fluctuation occure which is a big problem
for producer and consumer. The mineral nutrient content in the cluster and nuts of 'Uzun'
pistachio variety trees were investigated in this paper. Sampling were done using various
pysiological periods from full flowering to harvest time. According to the results, concentration
of N, P, K and Ca decreased level during the fruit bud abcissionperiod that needed more during
these periods and after this period the concentration of the elements increased up to the
maximum values specially after nut development. P, K, Mg, were determined to be inversely
correlated to fruit and cluster. N, P were higher in the fruit than the fruit cluster. It is thought
generally that the N, P, K, Ca elements may have a key role in the annual fruit production and
yield of pistachios. It was found that these elements are essential for fruit formation in pistachios
and have an effect on fruit bud abscission. It has been proved that there is a relationship between
nut set and flower bud abscission based on macroelemt contents during various developmental
stages in pistachio.