The Electronic Measurement of Small Herbage Yields Using a High Sensitivity Capacitance Meter

Lovett, J. V.; Burchi, G. J.

doi:10.1111/j.1365-2494.1972.tb00690.x

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…3). Such differences suggest variations in plant phenology may be a contributing factor because these differences can be attributed to differences in dry matter percentages (Lovett and Burch 1972). Further testing is desirable to evaluate this factor more precisely and determine exactly how plant litter and phenology influence the single probe meter.…”

Section: Resultsmentioning

confidence: 99%

Evaluation of a Single Probe Capacitance Meter for Estimating Herbage Yield

Currie¹,

Hilken²,

White³

1987

Journal of Range Management

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A single probe electronic capacitance meter for estimating herbage yields was geld tested on 2 western wheatgrass (Pawopyrum mithii (Rydb.) Liive), a blue grama (Bouteloua gmcilis (H.B.K.) Lag. ex Griffith@, crested wheatgrass (Agropyron cristutum (L.) Gaertn.), and Russian wildrye (Psuthrostachys juncea (Fisch.) Nevski) stands in the Northern Great Plains. This single probe meter is lightweight, portable, and allows the user to estimate yields of single plants to determine productivity of individual species. Linear regression equations were fitted between probe readings and the green and dry weight of forage clipped from individual plants within a 78.5cm* circular plot. An overall coefficient of determination (I*) of 0.50 was obtained with linear reiationships being statistically signfficant between the probe readings and green and dry weight of forage for ail regressions (eO.10). Considering the regression estimates for P, standard error of the estimate and F values, the best model fit occurred in the western wheatgrass and crested wheatgrass stands. Presence of a litter mat in 1 western wheatgrass stand had little influence on the precision of the instrument, but phenoiogy of the plants strongly influenced meter readings. Therefore, regression lines within a species could not be pooled across ail sampling dates. Comparing yields of individual species from the small plots of the single probe meter to yields from a larger, 1,858cm* rectangular plot estimated with a multi-probe capacitance meter showed comparfsons were not statistically different 50% of the time. A sample size of approximately 150 plots per species was required for each sample period for the single probe meter.

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Section: Resultsmentioning

confidence: 99%

Evaluation of a Single Probe Capacitance Meter for Estimating Herbage Yield

Currie¹,

Hilken²,

White³

1987

Journal of Range Management

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Evaluation of the size of a plant's root system using its electrical capacitance

Chloupek

1977

Plant Soil

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Limitations of the electronic capacitance meter in measuring yields of grazed tropical pastures

Jones

Sandland

Bunch

1977

Grass and Forage Science

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Relationships between readings of the electronic (capacitance) pasture meter and descriptions of pasture yield were examined over the yearly growth cycle in grazed pastures of Setaria anceps cv. Nandi, with or without Macroptilium atropurpurem cv. Siratro and Desmodium intortum cv. Greenleaf. There was a poor relationship between meter reading and pasture dry matter yield (r = +0-574 pooled over pastures and seasons) but this relationship was improved to r = +0-750 by inclusion of other regressors describing pasture height and proportion of inert material. Meter reading was more closely related to fresh pasture yield (r = +0-830), water yield (r = +0-885) or dried green yield (r = +0-830), although inclusion of a pasture height term still improved the relationship slightly. Suggestions are made about using the meter to estimate dried green yield rather than total dry matter yield, and taking more consideration of the proportion of inert material when relating the meter reading to total dry matter yield.Visual estimation was also compared with actual pasture yield measured by cutting. Even though prior training for yield estimation was inadequate, the relationships between visually estimated and actual yield were as good as those from the pasture meter. It is concluded that the pasture meter will not find a regular use as a sampling tool in most grazed tropical pastures.

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The Electronic Measurement of Small Herbage Yields Using a High Sensitivity Capacitance Meter

Cited by 4 publications

References 7 publications

Evaluation of a Single Probe Capacitance Meter for Estimating Herbage Yield

Evaluation of a Single Probe Capacitance Meter for Estimating Herbage Yield

Evaluation of the size of a plant's root system using its electrical capacitance

Limitations of the electronic capacitance meter in measuring yields of grazed tropical pastures

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