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Nutrient relations of winter wheat: 2. Movement of nutrients to the root and their uptake

Published online by Cambridge University Press:  27 March 2009

P. J. Gregory ,
D. V. Crawford  and
M. McGowan
M. McGowan
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leics.
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Summary

The purpose of this work was to determine the relative importance of mass flow and diffusion in supplying nutrients to wheat plants and to calculate nutrient uptake rates by roots (inflow). Winter wheat was grown in the field and measurements of plant Na, K, Ca, Mg, P, S and N contents, root length, plant water uptake and soil solution concentration made at regular intervals during growth. The apparent contribution of mass flow to plant uptake of nutrients between mid- April and mid-June was greater than the measured plant uptake for sodium, calcium, magnesium and sulphur (14, 9, 2 and 4 times respectively); however, only 50 % of the measured plant uptake of nitrogen and potassium and 5% of the phosphorus was supplied in this way. There were some 7 day periods when mass flow was able to supply the measured uptake of nitrogen and potassium, and it is possible that for these nutrients the importance of mass flow and diffusion may change during growth. Mean inflows (uptake in mol/cm root/sec) were calculated from sowing until mid- June. Inflow decreased for all nutrients from high initial values to low values during the winter and rose again in mid-April and May before falling in June. The increase in inflow in mid-April was concomitant with increased shoot growth but the precise factors controlling plant demand for nutrients and uptake in the field are still ill-defined.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 93 , Issue 2 , October 1979 , pp. 495 - 504
Copyright
Copyright © Cambridge University Press 1979

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