Abstract
The present paper is a review of previous work by the senior author [5, 6, 7, 8]. As demonstrated by experimental results for winter wheat, potatoes and sugar beet, soil tests for mineral nitrogen in early spring may be looked upon as a means of better assessing optimum fertilizer nitrogen requirements in commercial farming. A second soil test, at the onset of growth in potatoes and sugar beet, may be useful in considering nitrogen topdressings. It is recognized, however, that soil mineral nitrogen data do not provide a full explanation for the variation in optimum nitrogen dressings and other soil or climatic factors may be involved.
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