Concentration and size of gravel in relation to neutron miosture and density probe calibration
| cg.authorship.types | CGIAR single centre | |
| cg.contributor.affiliation | International Institute of Tropical Agriculture | |
| cg.coverage.country | Nigeria | |
| cg.coverage.iso3166-alpha2 | NG | |
| cg.coverage.region | Africa | |
| cg.coverage.region | Western Africa | |
| cg.howPublished | Formally Published | |
| cg.identifier.url | http://journals.lww.com/soilsci/Abstract/1979/01000/CONCENTRATION_AND_SIZE_OF_GRAVEL_IN_RELATION_TO.6.aspx | |
| cg.isijournal | ISI Journal | |
| cg.issn | 0038-075X | |
| cg.issue | 1 | |
| cg.journal | Soil Science | |
| cg.reviewStatus | Peer Review | |
| cg.subject.iita | LAND USE | |
| cg.subject.iita | SOIL INFORMATION | |
| cg.volume | 127 | |
| dc.contributor.author | Lal, R. | |
| dc.date.accessioned | 2017-05-22T09:56:38Z | en |
| dc.date.available | 2017-05-22T09:56:38Z | en |
| dc.identifier.uri | https://hdl.handle.net/10568/81152 | |
| dc.title | Concentration and size of gravel in relation to neutron miosture and density probe calibration | en |
| dcterms.abstract | The effects of four gravel concentrations (0, 20, 40, and 60 percent by weight) and three gravel size fractions (4-8 mm, 8-15 mm, and 15-40 mm) on the calibration of a neutron moisture meter and density probe was investigated for a beach sand and a clayey tropical Alfisol (Oxic Paleustalf). The slope of the regression line of the calibration curve relating neutron count ratio with volumetric moisture content of gravel-free sand was statistically significantly different from that of three gravel-sand mixtures. The calibration curve of three gravel-sand mixtures was statistically identical. For the gravel-soil mixtures, the slope of the calibration curve generally decreased with increased gravel concentration. The statistical comparison of the regression lines for the 4-8 mm gravel size fraction indicated that the slope coefficient of the calibration curve of only 60 percent gravel-soil mixture was significantly lower than that of 0, 20, and 40 gravel percentages. For the 8-15 mm gravel size fraction, the slopes of the regression lines of 40 and 60 percent gravel-soil mixtures were similar and significantly lower than that of 0 and 20 percent gravel concentrations. Gravel size had no effect on the calibration curve in the gravel-sand mixtures. In the gravel-soil mixtures, for 20 and 40 percent gravel concentrations, 4-8 mm gravel size had a significantly higher slope coefficient of the regression equations, compared with the 8-15 mm size fraction. The slope of the regression equation relating density count ratio with dry density significantly decreased with an increase in gravel concentration for 40 and 60 percent, compared with 0 and 20 percent gravels for gravel-soil mixtures. Heterogeneity of tropical soils, with regard to variations in texture and gravel concentrations, may necessitate a detailed calibration of the neutron moisture meter prior to its use on large watersheds. | en |
| dcterms.accessRights | Limited Access | |
| dcterms.audience | Scientists | |
| dcterms.bibliographicCitation | Lal, R. (1979). Concentration and size of gravel in relation to neutron miosture and density probe calibration. Soil Science, 127(1), 41-50. | en |
| dcterms.extent | 41-50 | |
| dcterms.issued | 1979 | |
| dcterms.language | en | |
| dcterms.subject | gravel concentrations | en |
| dcterms.subject | gravel size | en |
| dcterms.subject | soil | en |
| dcterms.subject | calibration | en |
| dcterms.type | Journal Article |
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