نتایج جستجو برای: agricultural total factorproductivity

تعداد نتایج: 890560  

2000
Jesse C. Thompson Earl B. Russell

In Illinois, agricultural education programs at the secondary level continue to experience enrollment declines (Craft, 1991). Data compiled between 1977 and 1986 by the Illinois Association of Vocational Agricultural Teachers (Witt. 1987) and the Illinois Board of Higher Education (Databook on Illinois Higher Education, 1986) from 1977 to 1986, showed declining numbers as high as 54 and 22 perc...

Journal: :Water environment research : a research publication of the Water Environment Federation 2015
Daniel D Snow David A Cassada Megan L Larsen Noelle A Mware Xu Li Matteo D'Alessio Yun Zhang J Brett Sallach

A total of 79 papers published in 2016 were reviewed ranging from detailed descriptions of analytical methods, to fate and occurrence studies, to ecological effects and sampling techniques for a wide variety of emerging contaminants likely to occur in agricultural environments. New methods and studies on veterinary pharmaceuticals, steroids, antibiotic resistance genes, cyanotoxins, and potenti...

Journal: :تحقیقات اقتصاد و توسعه کشاورزی ایران 0
روح اله رضایی استادیار دانشکده کشاورزی دانشگاه زنجان غلامرضا مجردی استادیار دانشکده کشاورزی دانشگاه زنجان

the main objective of this research was to analyze the barriers of implementing the total quality management (tqm) in agricultural faculties in the universities of north west of iran. the kind of research method of the study was an analytical- explanatory one. the statistical population of the study consisted of all the faculty members in agricultural faculties in the universities of north west...

2001
Bruce A. McCarl Brian C. Murray Uwe A. Schneider

We use a net present value framework to examine the impact of non-permanence on the economics of land-based biological carbon sequestration. Contingent on assumptions about discount rates, management, and carbon prices trajectories, and payment contract design, we find the adjusted value of carbon sequestration relative to permanently available emission offsets to be between 38 and 55 percent f...

Journal: :Journal of environmental management 2015
Lingling Hou Dana L K Hoag Catherine M H Keske

This study proposes the use of marginal abatement cost curves to calculate environmental damages of agricultural systems in China's Loess Plateau. Total system costs and revenues, management characteristics and pollution attributes are imputed into a directional output distance function, which is then used to determine shadow prices and abatement cost curves for soil and nitrogen loss. Marginal...

2017
Yu Han Yongyue Liu

This paper mainly studies the distribution center location of FMCG agricultural products. It assumes that the decayed rate of perishable products is linearly changing, and builds FMCG agricultural products distribution center location model of the lowest total cost. Filter the optimal distribution center using the combination of qualitative and quantitative analysis, with approximation algorith...

2014
Mercedes Campi Marco Dueñas Jorge Tadeo Lozano

This paper studies the effect of strengthening intellectual property rights (IPRs) after the signing of the TRIPS on agricultural trade, for the period 1995-2011. It uses data of agricultural exports and a new yearly index of intellectual property (IP) protection, for 60 developed and developing countries. Also, the paper studies bilateral trade links and the intensive and extensive margins of ...

Journal: :Environmental entomology 2010
Jonathan G Lundgren Janet K Fergen

The effects of an autumn-planted, spring-killed, grass cover crop (Elymus trachycaulus [Link] Gould ex Shinners) on populations of Diabrotica virgifera virgifera LeConte and its predator community were evaluated in South Dakota maize fields over two seasons. Abundance and size of D. virgifera larvae and adults and sex ratio of adults were measured in maize produced under two treatments (i.e., a...

2016
Chuanhe Xiong Degang Yang Jinwei Huo Maren Oelbermann

Greenhouse gas emissions from the agricultural ecosystem account for 7%–20% of the world’s total greenhouse gas emissions, while approximately 17% of China’s carbon emissions are from agriculture. In this study, based on the scientific calculation system of carbon emissions in agriculture, we calculated the carbon emissions of agriculture in the Hotan prefecture between 1999 and 2013 and analyz...

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