The von Liebig Hypothesis

Paris, Quirino

doi:10.2307/1243200

Cited by 152 publications

(120 citation statements)

References 9 publications

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“…Following Berck and Helfand (1990), Paris (1992), Chambers and Lichtenberg (1996), and Berck, Geoghegan and Stohs (2000), the production technology is modeled as of the von-Liebig type:…”

Section: With ( )mentioning

confidence: 99%

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Testing Day's Conjecture that More Nitrogen Decreases Crop Yield Skewness

Hennessy²,

Yu³

2012

American J Agri Economics

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While controversy surrounds skewness attributes of typical yield distributions, a better understanding is important for agricultural policy assessment and for crop insurance rate setting. Day (1965) conjectured that crop yield skewness declines with an increase in low levels of nitrogen use, but higher levels have no effect. In a theoretical model based on the law of the minimum (von Liebig) technology, we find conditions under which Day's conjecture applies. Employing four experimental plot datasets, we investigate the conjecture by introducing (a) a flexible Bayesian extension of the Just-Pope technology to incorporate skewness, and (b) a quantile-based measure of skewness shift. For corn yields, the Bayesian estimation provides strong evidence in favor of negative skewness at commercial nitrogen rates and for Day's conjecture. There was weaker evidence in favor of positively skewed cotton yield and little evidence in favor of the conjecture. The results are also confirmed by the quantile-based measure. AbstractWhile controversy surrounds skewness attributes of typical yield distributions, a

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“…Following Berck and Helfand (1990), Paris (1992), Chambers and Lichtenberg (1996), and Berck, Geoghegan and Stohs (2000), the production technology is modeled as of the von-Liebig type:…”

Section: With ( )mentioning

confidence: 99%

“…We interpret the emphasis on critical periods as a general belief that a law of the minimum production technology applies in the sense of, e.g., Paris (1992). It is noteworthy that Day explored data from Mississippi, far outside the main crop growing areas of the United States with soil and climate limitations that suggest that 'ideal'…”

mentioning

confidence: 99%

Testing Day's Conjecture that More Nitrogen Decreases Crop Yield Skewness

Hennessy²,

Yu³

2012

American J Agri Economics

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“…3) is, according to Frank et al [11] and Llewelyn and Featherstone [32], the most appropriate production function for corn yields. It allows for a growth plateau -i.e., maximum yield -which follows from the von Liebig approach to production functions (see Paris [37] for historical notes). Moreover, the Mitscherlich- In each of the three production functions, the elasticity of substitution between the two input factors is by definition different from zero and not constant.…”

Section: Three Types Of Production Functionsmentioning

confidence: 99%

The Application of Robust Regression to a Production Function Comparison - The Example of Swiss Corn

Finger

Hediger²

2009

SSRN Journal

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“…The Tobit model was created by Tobin (1958) and has been applied in household purchasing decisions, extramarital behaviour, labour supply and criminal activities (Greene 1993(Greene , 2003. In context of agricultural economics, it has been applied in adoption studies (Ransom et al 2003), commodity supply decisions (Mundlak 2002), disequilibrium models (Fair and Jafee Fair and Jaffee 1972), production economics (Paris 1992) and development economics (Goetz 1992) …”

Section: Theoretical Framework and The Tobit Modelmentioning

confidence: 99%

Evaluation of losses of replacement heifers in pastoral and peri-urban camel herds in semi-arid northern Kenya

2013

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This study estimated heifer losses and associated determinants in peri-urban camel herds characterized by market orientation and domination of lactating camels grazing closer to urban market outlets for milk. In this evolving peri-urban camel production system in semi-arid Kenya, the proportion of heifers born that survives to breeding age is important in sustaining the herds and the extent to which households obtain tangible and intangible benefits from camel keeping. Data was obtained through progeny history recall on 2,000 heifer loss cases out of 4,398 heifers born between 1991 and 2009. The estimated heifer loss was 0.455 and was 11.8% higher (P < 0.0001) in peri-urban herds (0.505 ± 0.040) than in pastoral herds (0.387 ± 0.047). The extent of heifer loss was significantly associated with veterinary service access (P < 0.05), labour hire (P < 0.01) and state of security (P < 0.01). Results provide lessons for policy intervention to support evolution of peri-urban camel milk production. Improving infrastructure and the security situation is necessary to enhance delivery of veterinary service and feed supply interventions to peri-urban camel herds for production of milk and breeding stock.

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The von Liebig Hypothesis

Cited by 152 publications

References 9 publications

Testing Day's Conjecture that More Nitrogen Decreases Crop Yield Skewness

Testing Day's Conjecture that More Nitrogen Decreases Crop Yield Skewness

The Application of Robust Regression to a Production Function Comparison - The Example of Swiss Corn

Evaluation of losses of replacement heifers in pastoral and peri-urban camel herds in semi-arid northern Kenya

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