Abstract
A QUICK and reliable method of determining the fertilizer requirements of crops and of discovering what nutrient deficiency is responsible for the unsatisfactory growth of some particular crop would be of immense value in advisory work. The problem can be approached from several different points of view, such as soil analysis, field trials, pot cultures, leaf injection, plant analysis and the use of visual symptoms. The relative advantages and disadvantages of these various methods of diagnosing fertilizer requirements are briefly but clearly summarized in the paper under notice*, and an extensive list of references facilitates fuller study of the individual methods.
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