The possibility of predicting solute uptake and plant growth response from independently measured soil and plant characteristics |
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Authors: | K K S Bhat A J Brereton P H Nye |
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Institution: | (1) Soil Science Laboratory, Department of Agricultural Science, University of Oxford, Oxford, UK;(2) Present address: East Malling Research Station, Maidstone, Kent;(3) Present address: The Agricultural Institute, Johnstown Castle, Wexford, Ireland |
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Abstract: | Summary The growth and nitrogen uptake response of rape plants to nitrate concentration at the root surface were studied in solution culture in a controlled environment cabinet over a period of 24 days. NO3
– was supplied at the rates of 10–5
M, 5×10–5
M, 10–4
M, 10–3
M and 10–2
M in solution and was maintained near these levels.With increasing mean N concentration in the tissues, the relative growth rate and leaf area ratio increased and unit leaf rate decreased slightly. Values of all three growth parameters decreased with plant age.The shoot: root dry weight ratios and their N content ratios increased with increasing mean per cent N in the plant. The length or surface area per unit dry weight of roots was correlated negatively with per cent N and positively with age.The maximum mean inflow of nitrate to rape roots decreased sharply with age. The concentration at which half maximal mean inflow was attained was 3.44×10–5
M NO3
–. |
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Keywords: | Brassica napus Growth analysis NO3 uptake rates Ontogenetic effects Root demand coefficient Root hairs Solution culture Shoot: root ratios Tissue N concentration |
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