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Soil-Water Extraction Profiles of Cotton (Gossypium hirsutum) and Weed Species

Published online by Cambridge University Press:  12 June 2017

Brent D. Jacobson
Affiliation:
Dep. Agron, Oklahoma State Univ., Stillwater, OK 74078
Don S. Murray
Affiliation:
Dep. Agron, Oklahoma State Univ., Stillwater, OK 74078
John F. Stone
Affiliation:
Dep. Agron, Oklahoma State Univ., Stillwater, OK 74078

Abstract

Soil-water profiles of cotton, several weeds, and bare soil were compared in research conducted in 1989 and 1990 near Perkins, OK. Neutron probe access tubes were installed prior to plant establishment to facilitate nondestructive volumetric water content determinations at selected depths throughout the season. Planting was in a double-circle pattern concentric around each neutron probe access tube. Phenological and soil-water data were collected weekly. As plants began to senesce, aboveground biomass yield data were collected. In 1989, rainfall frequently replenished soil-water in the upper soil profile. The plants used the recharge water to varying degrees, particularly late in the season. Common cocklebur and johnsongrass extracted soil-water from greater depths than cotton and velvetleaf throughout the season. In 1990, the largest differences detected between bare soil and weeds early in the season were measured for common cocklebur, devil's-claw, and silverleaf nightshade. Later in the season, however, there was little difference in soil-water content in the upper soil profiles for all species. Johnsongrass emerged later than the other species in 1990 which affected its relative soil-water extraction.

Type
Research
Copyright
Copyright © 1994 by the Weed Science Society of America 

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