Tomato responses to ammonium and nitrate nutrition under controlled root-zone pH |
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| Authors: | Peet M M Raper C D Tolley L C Robarge W P |
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| Institution: | Dept. of Horticultural Science, North Carolina State University, Raleigh 27695-7609, USA. |
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| Abstract: | Tomato (Lycopersicon esculentum L. Mill. 'Vendor') plants were grown for 21 days in flowing solution culture with N supplied as either 1.0 mM NO3- or 1.0 mM NH4+. Acidity in the solutions was automatically maintained at pH 6.0. Accumulation and distribution of dry matter and total N and net photosynthetic rate were not affected by source of N. Thus, when rhizosphere acidity was controlled at pH 6.0 during uptake, either NO3- or NH4+ can be used efficiently by tomato. Uptake of K+ and Ca2+ were not altered by N source, but uptake of Mg2+ was reduced in NH4(+)-fed plants. This indicates that uptake of Mg2+ was regulated at least partially by ionic balance within the plant. |
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