Leaf analysis as a guide to the nutrition of fruit crops. I.—general principles, sampling techniques and analytical methods

The general principles of leaf analysis and the factors influencing leaf composition are reviewed briefly. Methods of leaf sampling, including a statistical analysis of the method used at Long Ashton, are described. The overall sampling error, expressed as the coefficient of variation, is of the order of 6%, of which about I‐2 occurs at the analytical stage. Analytical methods are given for determining total N, P, K, Ca and Mg in leaf dry matter.