Investigation on the Assimilation of Nitrogen by Maize Roots and the Transport of Some Major Nitrogen Compounds by Xylem Sap |
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| Authors: | S IVANKO J INGVERSEN |
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| Institution: | Department of Radiobiology and Biochemistry, University of Agriculture, Nitra, Czechoslovakia and Agricultural Research Department, Danish Atomic Energy Commission, Research Establishment Risö, DK-4000 Roskilde, Denmark |
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| Abstract: | The uptake and assimilation of nitrate and ammonia have been studied in Zea mays. Nitrogen-starved maize roots are capable of accumulating a potential capacity for nitrogen uptake and assimilation. Reestablishment of nitrogen supply leads to intense uptake, reaching 154 % of the reference variant level after 24 hours when nitrate is supplied, and 121 % when ammonia is supplied. After 24 hours the insoluble nitrogen fraction accounts for 80, 54 and 55 % of the total taken up in the PK + NO3-, PK + NH4+ and NPK variants respectively. |
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