Summary
In a glasshouse experiment with a boron deficient soil the application of nitrogen was found to decrease the boron concentration and boron uptake by lucerne (Medicago sativa). Without added boron, nitrogen applications killed the lucerne, probably by inducing severe boron deficiency. With added boron, the lowest rate of nitrogen application increased lucerne yield but further additions depressed yields. The effect was due to a physiological interaction rather than an effect of the nitrogen on the availability of the boron in the soil.
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Willett, I.R., Jakobsen, P. & Zarcinas, B.A. Nitrogen-induced boron deficiency in lucerne. Plant Soil 86, 443–446 (1985). https://doi.org/10.1007/BF02145464
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DOI: https://doi.org/10.1007/BF02145464