Summary
Bean Plants were grown in a greenhouse in sand irrigated with nutrient solutions containing either 2 mM NO −3 or 2 mM NH +4 . After 45 days fresh weight of NH +4 plants was half that of NO −3 plants. Cation concentration in NH +4 plants was 30% less than in NO −3 plants. Amino acids (SER, ASN, GLN) accummulated 3 to 10 times more in NH +4 plants. The concentration of organic acids (malic, malonic, citric) was 10 to 30 times higher in NO −3 plants. The ATP-costings for the synthesis of amino acids and organic acids in NH +4 plants was half that of NO −3 ones: therefore it could not account for the reduction of growth in the ammonium-fed plants.
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Chaillou, S., Morot-Gaudry, J.F., Lesaint, C. et al. Nitrate or ammonium nutrition in french bean. Plant Soil 91, 363–365 (1986). https://doi.org/10.1007/BF02198124
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DOI: https://doi.org/10.1007/BF02198124