Plant SAP analysis gives farmers insight into how the plant can take up and mobilize nutrients. Traditional tissue testing is usually done at the top of the plant, sampling only the youngest leaves. SAP Analysis is actually a pair of tests, comparing nutrients in young and old leaves to see what is being taken up today and how the nutrients are moved around. Test results compare levels in young and old leaves across 24 different nutrients. One important comparison is Nitrogen efficiency, so the farmer can see how much Nitrogen is actually being taken up by the plant and calculate a cost analysis. Learn more about SAP Analysis and also some fascinating research about the relationship between silica, iron, and aluminum in grapevines.

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115: Examining Plant Nutrient Mobility with SAP Analysis

Sustainable Winegrowing