FACTORS AFFECTING THE INTERPRETATION AND ADOPTION OF PLANT ANALYSIS SERVICES

A review of the factors affecting the interpretation of plant analysis is presented. The development of plant test criteria is discussed in relation to plant part and age, seasonal nutrient changes, diurnal trends, Piper-Steenbjerg curvature, nutrient interaction and ratios, plant genotype, and environmental and crop management factors. The value of both diagnostic and prognostic plant tests is reviewed with specific emphasis on the role of prognostic tests in farmer decision making. Rapid sap testing is discussed in relation to development, utilisation, and role in agriculture. Factors affecting the utilisation of plant testing are reviewed. Within Australia the use of plant analysis services is low. Reasons for this low adoption and methods by which usage can be increased are discussed.