Full TGIF Record # 5370
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Web URL(s):https://link.springer.com/article/10.1007%2FBF01348518
    Last checked: 09/25/2017
Publication Type:
Author(s):Farr, E.; Vaidyanathan, L. V.
Author Affiliation:Soil Science Laboratory, Department of Agricultural Science, Oxford University, UK
Title:The supply of nutrient ions by diffusion to plant roots in soil: IV. Direct measurement of changes in labile phosphate content in soil near absorbing roots
Source:Plant and Soil. Vol. 37, No. 3, March 1972, p. 609-616.
# of Pages:8
Publishing Information:Dordrecht, Netherland: Martinus Nijhoff Publishers
Related Web URL:https://www.springerlink.com/content/r85181ktk3365686/
    Last checked: 10/06/2017
    Notes: Abstract only
Keywords:TIC Keywords: Lolium multiflorum; Nutrient uptake; Ions; Phosphorus
Abstract/Contents:"The concentration gradients of P32 labbelled phosphate were measured in a Coral Rag Clay soil, placed in contact with planes of onion and ryegrass roots for up to 12 days' growth. After contact with the roots the soil block, 3x2x1 cm was quick-frozen and sliced into sections 0.1 mm thick, on which the P32 was directly determined. The concentration: distance relationship showed only a small depletion profile, because the soil had a high power for buffering changes in phosphate concentration. There was also an unexpectedly large scatter (^D+-5% of mean) in the initial distribution of P32 in the undepleted soil; detailed analyses was, therefore, not possible. However, a constant reduced concentration at the root: soil boundary was indicated in all cases, corresponding to uptake (by onion) increasing linearly with square root of time. Calculations gave an effective diffusion coefficient in the range 0.29-.71x10-8 cm2/sec for a 10% depletion of the initial phosphate content at the root surface. These findings agree with previous inferences that supply of phosphate to plant roots in this soil could be accounted for by a simple diffusion process in which only ~10% of the long-term isotopically exchangeable phosphate was depleted; there was no evidence that the phosphate diffusion characteristics of this soil were altered by the presence of plant roots."
ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Farr, E., and L. V. Vaidyanathan. 1972. The supply of nutrient ions by diffusion to plant roots in soil: IV. Direct measurement of changes in labile phosphate content in soil near absorbing roots. Plant Soil. 37(3):p. 609-616.
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    Last checked: 09/25/2017
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