Dry matter and nitrogen accumulation are not affected by superopt1mal concentration of ammonium in flowing solution culture with pH control |
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| Authors: | James W Rideout C David Raper Jr |
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| Institution: | 1. Department of Agronomy and Soils , Clemson University, Pee Dee Research and Education Center , Route 1, Box 531, Florence, SC, 29501–9603;2. Department of Soil Science , North Carolina State University , Box 7619, Raleigh, NC, 27695–7619 |
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| Abstract: | Abstract While it is known that superoptimal concentrations of the nitrate (NO3 ?) ion in solution culture do not increase NO3 ? uptake or dry matter accumulation, the same is not known for the ammonium (NH4 +) ion. An experiment was conducted utilizing flowing solution culture with pH control to investigate the influence of superoptimal NH4 + concentrations on dry matter, nitrogen (N), potassium (K), calcium (Ca), and magnesium (Mg) accumulation by nonnodulated soybean plants. Increasing the NH4 + concentration in solution from 1 to 10 mM did not affect dry matter or N accumulation. Accumulations of K, Ca, and Mg were slightly decreased with the increased NH4 + concentration. The NH4 + uptake system, which is saturated at less than 1 mM NH4 +, is able to regulate uptake of NH4 + at concentrations as high as 10 mM. |
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