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| Registros recuperados: 31 | |
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| Dofonsou, Sika Gbegbelegbe; Lowenberg-DeBoer, James; Adeoti, Razack; Coulibaly, Ousmane; Lusk, Jayson L.. |
| The net impact of pest-resistant GM crops on the welfare of both producers and consumers in developing countries is currently unknown and subject to speculation. This study uses choice-based conjoint protocol to estimate the net impact of pest-resistant Genetically Modified (GM) cowpea on net social welfare in Benin given price and income risks. Results imply that Bt cowpea will increase expected net social welfare by about $US 50 million per year in Benin given no inefficiencies in the seed sector. If inefficiencies in the seed sector are such that cowpea growers can access Bt cowpea seeds only 50% of the time, net benefits from Bt cowpea drop to about $US 11 million per year. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2007 |
URL: http://purl.umn.edu/9817 |
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| Lambert, Dayton M.; Lowenberg-DeBoer, James; Malzer, Gary L.. |
| Site-specific application of manure has the potential to improve crop production and environmental quality. If manure is applied where it is needed, in the quantity required by the crop, over application, with attendant runoff and leaching problems can be reduced. To implement this approach growers need site-specific crop response information. Increasing availability of site-specific yield information offers a way to estimate such crop responses. The objective of this study is to develop a methodology for estimating site-specific response of corn and soybeans to manure given soil test information, and to use that methodology to analyze an on-farm manure management trial conducted near Sleepy Eye, Minnesota. Both quantity and quality of the crop is... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Research Methods/ Statistical Methods. |
| Ano: 2004 |
URL: http://purl.umn.edu/20091 |
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| Mishili, Fulgence J.; Fulton, Joan R.; Shehu, Musa; Kushwaha, Saket; Marfo, Kofi; Jamal, Mustafa; Chergna, Alpha; Lowenberg-DeBoer, James. |
| The production and trade of cowpea (Vigna Uniculata), called "blackeyed peas" in the US, are a growing business for farmers and merchants serving the rapidly expanding urban areas of West and Central Africa. Cowpea fits the needs of the urban poor. It is an inexpensive source of protein that does not require refrigeration. A better understanding of consumer preferences for cowpea is essential to market development. The main objective of the study was to determine the cowpea grain quality characteristics that command a price premium or provoke a discount in Ghanaian, Malian and Nigerian markets. Specifically, the study looked at the impact of the grain size, texture, color, eye color, and bruchid-damaged grains on cowpea market prices. The data for the... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Consumer/Household Economics. |
| Ano: 2007 |
URL: http://purl.umn.edu/28684 |
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| Lambert, Dayton M.; Lowenberg-DeBoer, James; Bongiovanni, Rodolfo. |
| Precision agricultural technology promises to move crop production closer to a manufacturing paradigm, but analysis of yield monitor, sensor and other spatial data has proven difficult because correlation among neighboring observations often violates the assumptions of classical statistical analysis. When spatial structure is ignored variance estimates tend to be inflated and significance levels of test statistics are reduced. The gap between data analysis and site-specific recommendations has been identified as one of the key constraints on widespread adoption of precision agriculture technology. This paper compares four approaches that explicitly incorporate spatial correlation into regression models: (1) a spatial econometric approach; (2) a polynomial... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2003 |
URL: http://purl.umn.edu/22022 |
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| Ibro, Germaine; Fulton, Joan R.; Lowenberg-DeBoer, James. |
| Kosai, a deep-fat fried fritter made from cowpea, is an important product for economic development and poverty alleviation. Kosai is sold as street food almost exclusively by women entrepreneurs who use the money they earn from selling kosai on savings and daily expenditures for their family. In addition, cowpea is the more important indigenous African legume and kosai production uses a significant amount of cowpea. Data was collected, via personal interviews, with about 400 vendors in three different cities in the West African country of Niger. Results revealed that vendors with more experience were more likely to be successful. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Community/Rural/Urban Development. |
| Ano: 2006 |
URL: http://purl.umn.edu/21160 |
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| Kushwaha, Saket; Musa, A.S.; Lowenberg-DeBoer, James; Fulton, Joan R.. |
| Cowpea is the most important indigenous African grain legume for both home use and as a cash crop. Because of its tolerance to drought it is especially important for the Sahel. Genetic transformation of cowpea with Bachilius Thurengius (Bt) genes to control pod boring insects has many advantages, but little is known of the potential consumer response. This paper analyzes and reports the results of a survey of 200 consumers in northern Nigeria in early 2003 concerning consumer awareness of and acceptance of biotechnology. Ninety percent of the respondents were aware of GM products. Those respondents who were most concerned about the ethics of genetic transformation were likely to disapprove of such products, while those individuals who identified... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Institutional and Behavioral Economics. |
| Ano: 2004 |
URL: http://purl.umn.edu/20216 |
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| Lambert, Dayton M.; Lowenberg-DeBoer, James; Malzer, Gary L.. |
| Understanding the relationship between soil fertility dynamics and crop response is conceptually appealing. Even more appealing is comprehension of the spatial and temporal heterogeneity of these connections over a production surface and across seasons. Knowledge of these interactions is complicated because nutrient carryover dynamics and crop response to inputs are determined simultaneously on the one-hand, and sequentially on the other. A second problem enters when crops are rotated, for example, in the corn-soybean system commonly practiced in the Corn Belt. This paper examines the nutrient carryover-crop response nexus using data from a corn-soybean, variable-rate nitrogen (N) and phosphorous (P) experiment conducted over five years. Site-specific corn... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2005 |
URL: http://purl.umn.edu/19452 |
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| Lambert, Dayton M.; Lowenberg-DeBoer, James. |
| Soybean production in narrow rows is not a novel idea. Wiggans (1939) reported yield advantages of drilled soybeans in narrow rows (8-inches) over soybeans planted in 28-inch rows. However, farmers, consultants, and extension agents face a bewildering array of information regarding optimal row widths intended to maximize return from corn and soybeans during a growing cycle. This information is further complicated by the choices of planting equipment specialized for certain row widths. That soybeans planted in narrow rows generally out-yield soybean produced in wider rows is well documented. However, what is not clear is which narrow row width consistently and significantly outperforms other widths, yield-wise and return-wise, in which regions (Devlin... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Crop Production/Industries. |
| Ano: 2001 |
URL: http://purl.umn.edu/28681 |
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| Faye, Mbene Dieye; Jooste, Andre; Lowenberg-DeBoer, James; Fulton, Joan R.. |
| In examining demand for a product it is useful to think of consumers not as purchasing the product, but as purchasing its characteristics that provide utility. Consequently, it is important to measure the specific characteristics that consumers perceive as providing them with utility. In this article a hedonic pricing model is used to investigate the influence of different cowpea characteristics on cowpea prices in Senegal. The results provide valuable information for research institutions, producers, and traders. Cowpea plant breeders should emphasise large grain size as the main characteristic since buyers are willing to pay a premium for this characteristic. This should translate into higher returns on R&D. There exist differences between markets in... |
| Tipo: Journal Article |
Palavras-chave: Demand and Price Analysis. |
| Ano: 2004 |
URL: http://purl.umn.edu/9494 |
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| Bongiovanni, Rodolfo; Lowenberg-DeBoer, James. |
| Adapting variable rate technology (VRT) to Argentine conditions requires methods that use inexpensive information and that focus on the inputs and variability common to Argentine maize and soybean growing areas. The goal of this study is to determine if spatial regression analysis of yield monitor data can be used to estimate the site-specific crop Nitrogen (N) response needed to fine tune variable rate fertilizer strategies. N has been chosen as the focus of this study because it is the most commonly used fertilizer by corn farmers in Argentina. The methodology uses yield monitor data from on-farm trials to estimate site-specific crop response functions. The design involves a strip trial with a uniform N rate along the strip and a randomized complete... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2001 |
URL: http://purl.umn.edu/20650 |
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| Langyintuo, Augustine S.; Lowenberg-DeBoer, James; Arndt, Channing. |
| Member countries of the Economic Community of West African States (ECOWAS) are expected to form a West African Monetary Zone (WAMZ) by 2004 whereby member countries would use a common currency in an attempt to promote regional integration. Evidence suggests that reduction in transaction cost as a result of a decrease or complete elimination of non-tariff barriers (NTBs) and a decrease in real interest rates in response to elimination of exchange rate differentials positively influence trade. The objective of this study is to quantify the effects of (a) a 7% real interest rate on capital and (b) zero NTBs within ECOWAS countries on cowpea trade in West and Central Africa in order to provide a measure of the potential impacts of a common monetary policy. The... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: International Relations/Trade. |
| Ano: 2003 |
URL: http://purl.umn.edu/22236 |
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| Lowenberg-DeBoer, James. |
| This analysis works out the economic implications for variable rate seeding of the corn population response curves estimated by Pioneer Hi-Bred agronomists. Examples are developed for various mixes of low, medium and high yield potential soil, as well as for a range of seed costs and variable rate equipment costs. The strategies analyzed were: variable rate planting using agronomic recommendations for each yield potential zone, variable rate planting using an economic decision rule for each yield potential zone, an information strategy which sets the uniform planting rate at the highest population indicated by agronomic recommendations for any part of the field and a second information strategy which uses an economic decision rule for the whole field based... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Precision farming; Variable rate; Corn; GPS; Production economics; Crop Production/Industries. |
| Ano: 1998 |
URL: http://purl.umn.edu/28685 |
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| Nistor, Adela P.; Lowenberg-DeBoer, James. |
| The representative farm planning model that is used for the 2005 Purdue University Top Farmer Crop Workshop base case was extended to include managed drainage activities in order to evaluate the impact of drainage management time on farm operations. The analysis considered two alternative enterprises: rotation corn soybeans with and without controlled drainage activities. The baseline solution assumed that controlled drainage has 10% higher average yields than free flowing drainage, one drainage control structure is needed each 20 acres, and all drainage management work was done on good field days. The results suggest that the baseline optimal solution was rotation corn-soybeans with controlled drainage where 1,500 acres were cultivated with corn... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Farm Management. |
| Ano: 2006 |
URL: http://purl.umn.edu/21389 |
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| Lambert, Dayton M.; Lowenberg-DeBoer, James; Griffin, Terry W.; Peone, J.; Payne, Tim; Daberkow, Stan G.. |
| Precision agriculture (PA) technology has been on the market for over ten years. Global Positioning Systems (GPS), Geographic Information Systems (GIS), yield monitors, variable rate technologies (VRT) and other spatial management technologies are being used by farmers worldwide, but questions remain about the profitability of the technology and its future. This paper summarizes: 1) data on adoption of PA technology worldwide, 2) review of PA economics studies and 3) efforts to make better use of yield monitor and other sensor data in crop management. The adoption estimates are based on reports by an international network of collaborators. This paper draws on USDA ARMS data to update U.S. PA adoption numbers. The PA profitability summary goes beyond... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agribusiness. |
| Ano: 2004 |
URL: http://purl.umn.edu/28615 |
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| Lambert, Dayton M.; Malzer, Gary L.; Lowenberg-DeBoer, James. |
| This paper compares two estimation methods of a three-stage least squares (3SLS) system of equations, corrected for spatial autocorrelation. The modeling approach is novel in that it is an extension of Anselin's (1988) seemingly unrelated regression (SUR) space-time spatial error model for panel data. An empirical comparison of the quasi-maximum likelihood (QML) estimation of the equation system, and Kelejian and Prucha's general moments (GM) estimation approach is presented. The model and estimation procedures introduced in this study are easily extended to other economic, agronomic, or biological models that must incorporate spatial and temporal effects in the model specification, and overcome simultaneous equation bias. The empirical example used in... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Research Methods/ Statistical Methods. |
| Ano: 2004 |
URL: http://purl.umn.edu/28667 |
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| Registros recuperados: 31 | |
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