Skip to main content

Silicon accumulation and water uptake by wheat

Mayland, H.F. and Wright, J.L. and Sojka, R.E. (1991) Silicon accumulation and water uptake by wheat. Plant and Soil. 137(2):191-199.

[img] PDF

Download (481kB)


Silicon (Si) content in cereal plants and soil-Si solubility may be used to estimate transpiration,
assuming passive Si uptake. The hypothesis for passive-Si uptake by the transpiration stream was tested
in wheat (Triticum aestivum cv. Stephens) grown on the irrigated Portneuf silt loam soil (Durixerollic
calciorthid) near Twin Falls, Idaho. Treatments consisted of 5 levels of plant-available soil water
ranging from 244 to 776 mm provided primarily by a line-source sprinkler irrigation system. Evapotranspiration
was determined by the water-balance method and water uptake was calculated from
evapotranspiration, shading, and duration of wet-surface soil. Water extraction occurred from the 0 to
150-cm zone in which equilibrium Si solubility (20°C) was 15 mg Si L-1 in the Ap and Bk (0-58 cm
depth) and 23 mg Si L-1 in the Bkq (58-165 cm depth).
At plant maturity, total Si uptake ranged from 10 to 32 g m-2, above-ground dry matter from 1200 to
2100 g m-2 and transpiration from 227 to 546 kg m 2. Silicon uptake was correlated with transpiration
(Siup = –0.7 + .06T, r2 = 0.85) and dry matter yield with evapotranspiration (Y = 119 + 3.3ET, r2 =
0.96). Actual Si uptake was 2.4 to 4.7 times that accounted for by passive uptake, supporting
designation of wheat as a Si accumulator. The ratio of Si uptake to water uptake increased with soil
moisture. The confirmation of active Si uptake precludes using Si uptake to estimate water use by

Item Type: Article
NWISRL Publication Number: 0754
Subjects: Irrigated crops > Small grain
Mass Import - autoclassified (may be erroneous)
Depositing User: Dan Stieneke
Date Deposited: 20 Nov 2010 21:53
Last Modified: 06 Dec 2016 23:50
Item ID: 563