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Soil Water Uptake by Alfalfa

Kohl, R.A. and Kolar, J.J. (1976) Soil Water Uptake by Alfalfa. Agronomy Journal. 68(3):536-538.

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Abstract

Water uptake patterns of alfalfa (Medicago sativa L.) assist us in understanding proposed models governing plant water uptake. The data in this paper are presented to elucidate some details of passive water uptake from profiles with nonuniform soil water distributions. Soil water content under an alfalfa seed crop was monitored with a neutron moisture probe. Alfalfa roots withdraw soil water in the lower portion of the root zone (where soil matric potentials were between —7 and —10 bars), while the upper portion of the profile was above —2 bars. This indicates that for passive water uptake to occur, large water potential differences must exist between the root xylem and the soil in the upper, moist portion of the profile. Plant water potential measurements support passive uptake.

Item Type: Article
NWISRL Publication Number: 0320
Subjects: Irrigated crops > Alfalfa
Soil > Soil water (soil moisture)
Mass Import - autoclassified (may be erroneous)
Depositing User: Dan Stieneke
Date Deposited: 20 Nov 2010 21:51
Last Modified: 15 Feb 2017 22:32
Item ID: 280
URI: https://eprints.nwisrl.ars.usda.gov/id/eprint/280

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