When fruit is harvested off the tree and carried off the field, a certain amount of nutrients are removed. Those are replaced from internal sources the tree has, from the soil, from nutrients in irrigation water, from the air, from decomposition of organic matter from litter and soil and from applied nutrients like fertilizers. At some point the tree takes up more nutrients from all these sources and makes more fruit that is then carried off, and the cycle continues. Mary Lu Arpaia at UCR worked on a calculator that estimates the amount of nutrients removed for a given harvest. Here's what is removed in an average 6,000 pound crop of Hass avocado.
This was the whole fruit, and nothing but the fruit. Fruit nutrient removal values are the averages of 4 grower lots (3 fruit per grower lot) harvested in June 1999. The peel, flesh and seed of individual fruit were analyzed. So this will vary from year to year and from orchard to orchard depending on what is available, but this is a good ballpark figure for what is in the harvested crop. Somehow that is going to be replaced to maintain a given yield. You can figure out what a given crop removal is by entering different yields in this calculator from Avocadosource.com: https://www.avocadosource.com/tools/NutRemCalc.htm
It's also a great site to see the nutritional content of a variety of fertilizers: https://www.avocadosource.com/tools/FertCalc.htm and to prepare for next year's nutrition based on this year's leaf analysis. Won't get rich harvesting the silver in avocado fruit, and gold isn't listed in the calculator.