The Purepecha Sierra in Michoacan is considered the most important avocado producing region in the world. Factors restricting production have not been properly identified. They require undergoing reseach to propose better crop management alternatives conducive to high yields and optimal fruit quality. In this study we evaluated soil fertility in avocado orchards and determined the nutrimental state of the crop through foliar analysis applying Kenworthy’s balance indexes procedure. We collected soil and foliar samples from avocado (Persea americana Mill.) cv. Hass orchards within an area of 35,000 ha in the region. Soil fertility diagnosis indicated strong acid pH, low to very low levels of organic matter, P, Mn, and inorganic N; high to very high concentrations of Cu, Fe, K, Ca, B and Zn; and intermediate levels of Mg. Foliar concentration intervals generated for avocado in the Purepecha region showed differences from values determined by other researchers for different avocado producing regions from other countries. Estimated Kenworthy’s balance indexes helped to determine, in general terms, that: Zn, Mn, and Cu were present at deficient levels below normal, B was present in excess, and K, N, Mg and P in normal concentrations.

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