Rapid and nondestructive estimation of the nitrogen nutrition index in winter barley using chlorophyll measurements

Rapid, accurate and dynamic diagnosis of nitrogen (N) status is essential for evaluating plant vigor, predicting crop production and optimizing N management in winter barley (Hordeum vulgare L.). The objectives of this study were to determine the correlations between N nutrition index (NNI), leaf N gradient and chlorophyll meter (CM) readings gradient for different leaf positions and to compare the stability of the relationships between NNI and...