Abstract
Publisher Summary This chapter reviews the quantitative measurement of nitrogen deficiency in plants. It proposes five plant parameters for estimating nitrogen stress: leaf nitrogen, dry weight, leaf elongation, leaf area, and carbon dioxide exchange rate (CER). The criteria for choosing the parameters that should be used are as follows: (1) the parameter that has the greatest meaning for the objectives of the project, (2) the equipment and expertise that are available, and (3) the measurement that uses the least resources. The conventional approaches to deficiency through response curves and tissue analyses are inadequate bases to quantify deficiency rigorously except in special circumstances. By analogy with water stress, an attempt has been made to establish the basic requirements for a concept of nutrient stress and a proposal has been offered on the way they might be put into practice. The chapter discusses the factors affecting nitrogen stress and a number of applications of nitrogen stress.
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