MICROELEMENTS IN CULTURE‐SOLUTION EXPERIMENTS WITH HIGHER PLANTS

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	Year	Citations
AMMONIUM AND NITRATE NITROGEN NUTRITION OF BARLEY AT DIFFERENT SEASONS IN RELATION TO HYDROGEN-ION CONCENTRATION, MANGANESE, COPPER, AND OXYGEN SUPPLY Daniel I. Arnon Soil Science EngineeringSustainable AgricultureAgricultural EconomicsCrop SciencePlant Nutrition	1937	128
Some aspects of the salt nutrition of higher plants D. R. Hoagland The Botanical Review NutritionEngineeringBotanySalt NutritionAgricultural Economics	1937	37
The Importance of Ash Elements in the Cultivation of Excised Root Tips William J. Rôbbins, Virginia B. White, J. E. McClary, Proceedings of the National Academy of Sciences	1936	25

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