Understanding the annual phenomenon of pistachio Iranian Pistachio trees

In pistachios, salivation is like a genetic phenomenon, like smiling. In most horticultural crops, the main reason for the year is that the plant produces few flower buds in the year when it has a high yield, so the next year, due to the lack of flower buds, the amount of crop decreases. However, pistachios produce a large amount of flower buds every year, but in the year of fertility, a large amount of flower buds fall off and reduce the amount of crop per year.