Abstract
Abstract Soil test interpretation, the process of developing fertilizer application recommendations from soil test levels and other soil, crop and climatic conditions, is a commonly used but poorly understood procedure. This paper discusses the shapes of curves that represent yield response to applied nutrients and investigates the perception that the most common shape is curvilinear. A common set of data is used to compare the fertilizer recommendations made using the Mitscherlich‐Bray, yield response and plateau yield point methods of soil test interpretation.
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