Leaf analysis is a valuable and often underutilized tool in blueberry nutrition programs. It provides a means of accurately identifying nutritional problems that are difficult to diagnose by soil testing or observing bush appearance. More importantly, growers can identify and correct potential nutrient shortages before growth or yield is affected.

Interpretation: Leaf analysis results are interpreted relative to a critical or deficient level for each nutrient. When leaf concentrations are below the critical level, bushes are likely to respond to nutrient applications.  Sufficient levels are the normal range seen in healthy, productive bushes that are not expected to respond to nutrient additions. Usually there is a difference between the deficiency level and the lowest concentration that is considered sufficient. Bushes containing leaf levels between the deficient and sufficient ranges would not be expected to respond to nutrient applications but should be monitored closely. Deficient and sufficient levels for some nutrients have been researched extensively and are well understood. The requirements of other nutrients -- such as B, Cu, Mn, S and Zn -- are not as well understood. Deficient and sufficient levels of these nutrients may change slightly as more information is available. Concentrations of several nutrients in leafs, change over development. If samples are collected earlier or later than normal, consider seasonal changes when interpreting results.

(Information Courtesy of Michigan State University Extension,Van Buren County)