The Effects of Soil-Profile Variations and Related Factors on Neutron-Moderation Measurements

Cannell, Glen H.; Asbell, C. W.

doi:10.1097/00010694-197402000-00009

Cited by 7 publications

(3 citation statements)

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“…The equation for this calibration curve is 0V =(0.053 Xcounts) -5.75. Similar master calibration curves have been used in other studies to characterize multiple soils in a given geographic area with a high degree of accuracy (Rawls and Asmussen, 1973;Cannell and Asbell, 1974).…”

Section: Calibration Of Neutron Probementioning

confidence: 93%

“…Simple counts, as opposed to count ratios, were used for the calibration in this project because only one instrument was used. Numerous other researchers (Holmes and Jenkinson, 1959;Luebs and others, 1968;Olgaard and Haahr, 1968;Gornat and Goldberg, 1972;and Cannell and Asbell, 1974) also have applied neutron-probe data without using count ratios.…”

Section: Calibration Of Neutron Probementioning

confidence: 99%

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Estimating soil matric potential in Owens Valley, California

Sorenson¹,

Miller²,

Welch³

et al. 1988

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Cl Introduction Cl Purpose and scope C2 Description of the study area C2 Plant communities C2 Theory and basic definitions C2 Experimental procedures C4 Design of water-table drawdown sites C4 Filter-paper method C4 Field procedure C6 Laboratory procedure C6 Neutron probe C6 Description of use of neutron probe C6 Calibration of neutron probe C7 Recalibration of the filter-paper method C8 Soil water characteristics model C9 Application and results CIO Application of soil water characteristics model to specific sites in Owens Valley CIO Selection of soil water characteristic curves CIO Evaluation of estimated soil water characteristic curves C12 Verification of soil water characteristics model C13 Use of soil water characteristic curves estimated from the model to estimate soil matric potential from neutron-probe data C13 Use of estimates of soil matric potential in Owens Valley studies C14 Evaluation of methods of estimating soil matric potential C14 Filter-paper method C14 Soil water characteristics model C16 Conclusions C16 References cited C17 Glossary CIS FRONTISPIECE Perspective and oblique view of Owens Valley, California, showing the dramatic change in topographic relief between the valley and surrounding mountains. VI Contents

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Section: Calibration Of Neutron Probementioning

confidence: 93%

Section: Calibration Of Neutron Probementioning

confidence: 99%

Estimating soil matric potential in Owens Valley, California

Sorenson¹,

Miller²,

Welch³

et al. 1988

Open-File Report

View full text Add to dashboard Cite

show abstract

“…2). Cannell & Asbell (1974) found that neutron probe measurements made in soils with sharp textural breaks can be in error by as much as 8%. The soil water content error may be greater or less than water contents measured gravimetrically, depending on whether the neutron measurement is made on entering or leaving a sandy layer.…”

Section: Patterns Of Water Extraction For Different Crops and Seasonsmentioning

confidence: 97%

Soil water measurements on four alluvial soils in Canterbury 1. Soil water extraction patterns under spring-sown peas and barley, and pasture

Webb¹

1989

New Zealand Journal of Crop and Horticultural Science

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Changes in water content of four soil types from alluvium were monitored under springsown barley during 1978/79, spring-sown peas during 1979/80 and under pasture during September 1981-August 1984. The soil types varied in texture and depth to sandy gravels and are representative of a large area of the Canterbury and North Otago Plains. Patterns of soil water depletion over time are depicted graphically for representative soils in each season. All crops extracted similar amounts of water from the upper 30 cm, but spring-sown crops extracted less water below 30 cm. In stone-free soils, pea and barley crops obtained more than 80% of their total soil water from above 60 cm depth, and pasture obtained less than 60% of total soil water from the same depth. Pasture grown in moderately deep and shallow soils extracted 70-80% of total soil water from above 60 cm. Spring-sown crops extracted water to 90-100 cm depth in stone-free horizons, but pasture extracted water to at least 120 cm in soils underlain by sandy gravels, and to 180 cm in deep stone-free soils. High amounts of soil watcrextracted by pasture from subsoil horizons were considered to be related to perching of water in sandy layers.

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