Influence of nitrate concentration at the root surface on yield and nitrate uptake of kohlrabi (Brassica oleracea gongyloides L.) and spinach (Spinacia oleracea L.) |
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Authors: | B Steingrobe M K Schenk |
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Institution: | 1. Institute of Plant Nutrition, University of Hannover, Herrenh?user Str. 2, DW-3000, Hannover 21, Germany
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Abstract: | The objective of this study was to determine if plant roots have to take up nitrate at their maximum rate for achieving maximum
yield. This was investigated in a flowing-solution system which kept nutrient concentrations at constant levels. Nitrate concentrations
were maintained in the range 20 to 1000 μM. Maximum uptake rate for both species was obtained at 100 μM.
Concentrations below 100 μM resulted in decreases in uptake rate per cm root (inflow) for both spinach and kohlrabi by 1/3 and 2/3, respectively. However,
only with kohlrabi this caused a reduction in N uptake and yield. Thus indicating that this crop has to take up nitrate at
the maximum inflow. Spinach, however, compensated for lower inflows by enhancing its root absorbing surface with more and
longer roots hairs. Both species increased their root length by 1/3 at low nitrate concentrations. |
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Keywords: | kohlrabi nitrate spinach root root hairs uptake rate |
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