Leaf analysis as a guide to the nutrition of fruit crops. V.—sand culture N, P, K, Mg experiments with strawberry (Fragaria spp.)

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Abstract
A study has been made, by means of factorial sand culture pot experiments, of the relationship between N, P, K and Mg concentrations in the laminae of recently matured leaves of strawberry at flowering, at fruiting and after fruiting, and the yield and grade of fruit. Leaf‐N levels at flowering and at fruiting are higher in pot plants than in plants growing under field conditions. Thus the relation between leaf‐N and yield derived from pot experiments, in which the N‐supply is kept constant, differs from that in the field, where the N‐supply declines throughout the growing season. The agreement with field experience is good for phosphorus and potassium. Standard leaf values representing deficient, marginal and sufficient concentrations of N, P, K and Mg at flowering, at fruiting and after fruiting are suggested.