Abstract An improved universal soil extracting solution prepared by adding DTPA to Morgan's solution is presented. As with the Morgan's solution, it is possible to determine all important elements except sodium in a single extract but with better correlations of extracted trace elements with plant growth. Methods for determination of important elements are given along with suggested treatments to change undesirable levels of elements to favorable ones. Maximum value is obtained from use of the extracting solution by determination of soluble N along with other elements in soil samples collected frequently from same crop. Key words: Extracting solutionsoil fertilityavailable nutrientsfertilizationdiagnosis

Abstract A comprehensive system for the determination of N,‐ P, K, Ca, Mg, Na, B, Cu, Fe, Zn, S, and F in plant tissue is presented. A wet ash procedure using sulfuric acid and hydrogen peroxide permits determination of N, P, K, Ca, Mg, Na, B, Cu, Fe, Zn in one digest. S and F are determined in solutions of separate dry ashings. The use of leaf analyses and its limitations are discussed. Key words: Leaf analysesdiagnosis

Suggestions are made for the elimination of some interferences with the azomethine‐H method for boron analysis of soil extracts, leaves, plants, manures, composts, nutrient solutions and irrigation waters.